19-5009; Rev 1; 3/10
5GHz, 4-Channel MIMO Transmitter
The MAX2850 is a single-chip, 4-channel RF transmitter
IC designed for 5GHz wireless HDMI applications. The
IC includes all circuitry required to implement the complete 4-channel MIMO RF transmitter function and crystal oscillator, providing a fully integrated transmit path,
VCO, frequency synthesis, and baseband/control interface. It includes a fast-settling, sigma-delta RF fractional
synthesizer with 76Hz frequency programming step
size. The IC also integrates on-chip I/Q amplitude and
phase-error calibration circuits. Dynamic on/off control
of four external PAs is implemented with programmable
precision voltages. A 4-to-1 analog mux routes external
PA power-detect voltages to the RSSI pin.
On-chip monolithic filters are included for transmitter I/Q
baseband signal reconstruction to support both 20MHz
and 40MHz RF channels. The baseband filtering and
Tx signal paths are optimized to meet stringent WHDI
requirements. The upconverter local oscillator is coherent among all the transmitter channels.
The reverse-link control channel uses an on-chip 5GHz
OFDM receiver. It shares the RF synthesizer and LO generation circuit with the MIMO transmitters. The receiver
includes both an in-channel RSSI and an RF RSSI.
The MIMO transmitter chip is housed in a small, 68-pin
thin QFN leadless plastic package with exposed pad.
Applications
5GHz Wireless HDMI (WHDI)
5GHz FDD Backhaul and WiMax™
5GHz MIMO Transmitter Up to Four Spatial
Streams
Features
S
5GHz 4x MIMO Downlink Transmitters, Single
Uplink IEEE 802.11a Receiver
4900MHz to 5900MHz Frequency Range
-5dBm Transmit Power (54Mbps OFDM)
Coherent LO Among Transmitters
31dB Tx Gain-Control Range with 0.5dB Step
Size, Digitally Controlled
Tx/Rx I/Q Error and LO Leakage Detection and
Adjustment
Programmable 20MHz/40MHz Tx I/Q Lowpass
Anti-Aliasing Filter
4-to-1 Analog Mux for PA Power Detect
4-Channel PA On/Off Control
4.5dB Rx Noise Figure
70dB Rx Gain-Control Range with 2dB Step
Size, Digitally Controlled
60dB Dynamic Range Receiver RSSI
RF Wideband Receiver RSSI
Programmable 20MHz/40MHz Rx I/Q Lowpass
Channel Filters
Sigma-Delta Fractional-N PLL with 76Hz
Resolution
Monolithic Low-Noise VCO with -35dBc
Integrated Phase Noise
4-Wire SPI™ Digital Interface
I/Q Analog Baseband Interface
Digital Tx/Rx Mode Control
On-Chip Digital Temperature Sensor Readout
Complete Baseband Interface
Digital Tx/Rx Mode Control
S +2.7V to +3.6V Supply Voltage
S Small, 68-Pin Thin QFN Package (10mm x 10mm)
Ordering Information
5GHz Beam Steering Transmitter
PART
MAX2850ITK+
TEMP RANGE
PIN-PACKAGE
-25NC to +85NC
68 Thin QFN-EP*
*EP = Exposed pad.
+Denotes a lead(Pb)-free/RoHS-compliant package.
WiMax is a trademark of WiMax Forum.
SPI is a trademark of Motorola, Inc.
Typical Operating Circuit appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX2850
General Description
MAX2850
5GHz, 4-Channel MIMO Transmitter
ABSOLUTE MAXIMUM RATINGS
VCC_ Pins to GND.................................................-0.3V to +3.9V
RF Inputs Maximum Current: RXRF+, RXRFto GND.................................................................-1mA to +1mA
RF Outputs: TXRF1+, TXRF1-, TXRF2+, TXRF2-,
TXRF3+, TXRF3-, TXRF4+, TXRF4- to GND......-0.3V to +3.9V
Analog Inputs: TXBB1I+, TXBB1I-, TXBB1Q+,
TXBB1Q-, TXBB2I+, TXBB2I-, TXBB2Q+,
TXBB2Q-, TXBB3I+, TXBB3I-, TXBB3Q+, TXBB3Q-,
TXBB4I+, TXBB4I-, TXBB4Q+, TXBB4Q-, PA_DET1,
PA_DET2, PA_DET3, PA_DET4, XTAL,
XTAL_CAP to GND............................................-0.3V to +3.9V
Analog Outputs: RXBBI+, RXBBI-, RXBBQ+,
RXBBQ-, RSSI, CLKOUT2, VCOBYP, CPOUT+,
CPOUT-, PA_BIAS1, PA_BIAS2,
PA_BIAS3, PA_BIAS4 to GND...........................-0.3V to +3.9V
Digital Inputs: ENABLE, CS, SCLK, DIN to GND.... -0.3V to +3.9V
Digital Outputs: DOUT, CLKOUT to GND.............-0.3V to +3.9V
Short-Circuit Duration
Analog Outputs.................................................................. 10s
Digital Outputs.................................................................... 10s
RF Input Power............................................................... +10dBm
RF Output Differential Load VSWR......................................... 6:1
Continuous Power Dissipation (TA = +85NC)
68-Pin Thin QFN (derate 29.4mW/NC above +70NC).....2352mW
Operating Temperature Range........................... -25NC to +85NC
Junction Temperature......................................................+150NC
Storage Temperature Range............................. -65NC to +160NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
CAUTION! ESD SENSITIVE DEVICE
DC ELECTRICAL CHARACTERISTICS
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, ENABLE set according to operating mode, CS = high, SCLK
= DIN = low, transmitter in maximum gain, TA = -25NC to +85NC. Power matching and termination for the differential RF output pins
using the Typical Operating Circuit. 100mVRMS differential I and Q signals applied to I/Q baseband inputs of transmitters in transmit
mode. Typical values measured at VCC = 2.85V, TA = +25NC, LO frequency = 5.35GHz, TA = +25NC. Channel bandwidth is set to
40MHz. PA control pins open circuit, VCC_PA_BIAS is disconnected.) (Note 1)
PARAMETERS
CONDITIONS
Shutdown mode
Clock-out only mode
Supply Current
MIN
TA = +25NC
10
XTAL oscillator, load =
10pF
3
V
FA
60
89
One transmitter is on
188
235
Four transmitters are on
505
661
11
mA
135
174
One transmitter is on
214
261
Four transmitters are on
532
686
268
327
1.1
1.3
V
1.1
V
20
FA
Receive calibration mode
Rx I/Q Output Common-Mode
Voltage
0.9
Tx Baseband Input CommonMode Voltage Operating Range
0.5
Source current
UNITS
3.6
7.4
Receive mode
Transmit calibration mode
MAX
TCXO input, load =
10kI||10pF
Standby mode
Transmit mode
Tx Baseband Input Bias Current
TYP
2.7
Supply Voltage, VCC
10
2 _______________________________________________________________________________________
5GHz, 4-Channel MIMO Transmitter
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, ENABLE set according to operating mode, CS = high, SCLK
= DIN = low, transmitter in maximum gain, TA = -25NC to +85NC. Power matching and termination for the differential RF output pins
using the Typical Operating Circuit. 100mVRMS differential I and Q signals applied to I/Q baseband inputs of transmitters in transmit
mode. Typical values measured at VCC = 2.85V, TA = +25NC, LO frequency = 5.35GHz, TA = +25NC. Channel bandwidth is set to
40MHz. PA control pins open circuit, VCC_PA_BIAS is disconnected.) (Note 1)
PARAMETERS
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC INPUTS: ENABLE, SCLK, DIN, CS
VCC 0.4
Digital Input-Voltage High, VIH
Digital Input-Voltage Low, VIL
Digital Input-Current High, IIH
Digital Input-Current Low, IIL­
V
0.3
V
-1
+1
FA
-1
+1
FA
LOGIC OUTPUTS: DOUT, CLKOUT
Digital Output-Voltage High, VOH
Sourcing 1mA
Digital Output-Voltage Low, VOL
Sinking 1mA
Digital Output Voltage in
Shutdown Mode
Sinking 1mA
VCC 0.4
V
0.4
V
VOL
V
AC ELECTRICAL CHARACTERISTICS—Rx MODE
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, RF frequency = 5.351GHz, TA = -25NC to +85NC. LO frequency
= 5.35GHz. Reference frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at RXRF+ and
RXRF- differential ports using the Typical Operating Circuit. Receiver I/Q output at 100mVRMS loaded with 10kI differential load
resistance and 10pF load capacitance. The RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at VCC
= 2.85V, channel bandwidths of 40MHz, TA = +25NC.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RECEIVER SECTION: RF INPUT TO I/Q BASEBAND LOADED OUTPUT (Includes 50I to 100I RF Balun and Matching)
RF Input Frequency Range
4.9
5.9
Peak-to-Peak Gain Variation
over RF Frequency Range at
One Temperature
4.9GHz to 5.35GHz
0.3
2.6
5.35GHz to 5.9GHz
2.2
5.3
RF Input Return Loss
All LNA settings
-6
Maximum gain; Main address 1 D7:0 = 11111111
Total Voltage Gain
61
Minimum gain; Main address 1 D7:0 = 00000000
RF Gain Steps Relative to
Maximum Gain
Baseband Gain Range
Main address 1 D7:D5 = 110
-8
Main address 1 D7:D5 = 101
-16
Main address 1 D7:D5 = 001
-32
Main address 1 D7:D5 = 000
-40
From maximum baseband gain (Main address 1 D3:D0
= 1111) to minimum baseband gain (Main address 1
D3:D0 = 0000)
Baseband Gain Step
RF Gain Change Settling Time
Gain settling to within Q0.5dB of steady state; RXHP = 1
27.5
30
dB
dB
68
-2
GHz
+5
dB
dB
32.5
dB
2
dB
400
ns
_______________________________________________________________________________________ 3
MAX2850
DC ELECTRICAL CHARACTERISTICS (continued)
MAX2850
5GHz, 4-Channel MIMO Transmitter
AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, RF frequency = 5.351GHz, TA = -25NC to +85NC. LO frequency
= 5.35GHz. Reference frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at RXRF+ and
RXRF- differential ports using the Typical Operating Circuit. Receiver I/Q output at 100mVRMS loaded with 10kI differential load
resistance and 10pF load capacitance. The RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at VCC
= 2.85V, channel bandwidths of 40MHz, TA = +25NC.) (Note 1)
PARAMETER
CONDITIONS
Baseband Gain-Change Settling
Time
Gain settling to within Q0.5dB of steady state; RXHP = 1
DSB Noise Figure
4.5
Maximum RF gain - 16dB
(Main address 1 D7:D5 = 101)
15
Balun input referred,
integrated from 10kHz
to 19MHz at I/Q baseband output for 40MHz
RF bandwidth
Maximum RF gain (Main
address 1 D7:D5 = 111)
4.5
Maximum RF gain - 16dB
(Main address 1 D7:D5 = 101)
15
-65dBm wanted signal; RF
gain = max (Main address 1
D7:D0 = 11101001)
-13
-49dBm wanted signal; RF
gain = max - 16dB (Main
address 1 D7:D0 = 10101001)
-5
-45dBm wanted signal; RF
gain = max - 32dB (Main
address 1 D7:D0 = 00111111)
11
-65dBm wanted signal; RF
gain = max (Main address 1
D7:D0 = 11101001)
-13
-49dBm wanted signal; RF
gain = max - 16dB (Main
address 1 D7:D0 = 10101001)
-5
-45dBm wanted signal; RF
gain = max - 32dB (Main
address 1 D7:D0 = 00101001)
11
40MHz RF channel;
two tone jammers at
+50MHz and +96MHz
frequency offset with
-39dBm/tone
Output 1dB Gain Compression
200
Maximum RF gain (Main
address 1 D7:D5 = 111)
Out-of-Band Input IP3
Input 1dB Gain Compression
TYP
Balun input referred,
integrated from 10kHz
to 9.5MHz at I/Q baseband output for 20MHz
RF bandwidth
20MHz RF channel;
two tone jammers at
+25MHz and +48MHz
frequency offset with
-39dBm/tone
1dB Gain Desensitization by
Alternate Channel Blocker
MIN
UNITS
ns
dB
dBm
Blocker at Q40MHz offset frequency for 20MHz RF
channel
-24
Blocker at Q80MHz offset frequency for 40MHz RF
channel
-24
dBm
Max RF gain (Main address 1 D7:D5 = 111)
-32
Max RF gain - 8dB (Main address 1 D7:D5 = 110)
-24
Max RF gain - 16dB (Main address 1 D7:D5 = 101)
-16
Max RF gain - 32dB (Main address 1 D7:D5 = 001)
0
Over passband frequency range; at any gain setting;
1dB compression point
MAX
0.63
4 _______________________________________________________________________________________
dBm
VP-P
5GHz, 4-Channel MIMO Transmitter
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, RF frequency = 5.351GHz, TA = -25NC to +85NC. LO frequency
= 5.35GHz. Reference frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at RXRF+ and
RXRF- differential ports using the Typical Operating Circuit. Receiver I/Q output at 100mVRMS loaded with 10kI differential load
resistance and 10pF load capacitance. The RSSI pin is loaded with 10kI load resistance to ground. Typical values measured at VCC
= 2.85V, channel bandwidths of 40MHz, TA = +25NC.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
Baseband -3dB Lowpass Corner
Frequency
Main address 0 D1 = 0
9.5
Main address 0 D1 = 1
19
Baseband Filter Stopband
Rejection
Rejection at 30MHz offset frequency for 20MHz channel
57
70
Rejection at 60MHz offset frequency for 40MHz channel
57
70
Baseband -3dB Highpass Corner Main address 5 D1 = 1
Frequency
Main address 5 D1 = 0
Steady-State I/Q Output DC Error
with AC-Coupling
MAX
MHz
dB
600
kHz
10
50Fs after enabling receive mode and toggling RxHP
from 1 to 0, averaged over many measurements if I/Q
noise voltage exceeds 1mVRMS, at any given gain setting, no input signal, 1-sigma value
UNITS
2
mV
I/Q Gain Imbalance
1MHz baseband output, 1-sigma value
0.1
dB
I/Q Phase Imbalance
1MHz baseband output, 1-sigma value
0.2
degrees
Sideband Suppression
1MHz baseband output (Note 2)
40
dB
LO frequency
-75
Receiver Spurious Signal
Emissions
2 x LO frequency
-62
3 x LO frequency
-75
4 x LO frequency
-60
RF RSSI Output Voltage
-20dBm input power
1.75
Baseband RSSI Slope
19.5
26.5
dBm/
MHz
V
35.5
mV/dB
Baseband RSSI Maximum Output
Voltage
2.3
V
Baseband RSSI Minimum Output
Voltage
0.5
V
RF Loopback Conversion Gain
Tx VGA gain at maximum (Main address 9 D9:D4
= 111111); Rx VGA gain at maximum - 24dB (Main
address 1 D3:D0 = 0101)
-6
+2
+10
dB
AC ELECTRICAL CHARACTERISTICS—Tx MODE
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, RF frequency = 5.351GHz, TA = -25NC to +85NC. LO frequency
= 5.35GHz. Reference frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at TXRF+ and
TXRF- differential ports using the Typical Operating Circuit. 100mVRMS sine and cosine signal applied to I/Q baseband inputs of
transmitter (differential DC-coupled). Typical values measured at VCC = 2.85V, channel bandwidths of 40MHz, TA = +25NC.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
5.9
GHz
6.4
dB
TRANSMIT SECTION: Tx BASEBAND I/Q INPUTS TO RF OUTPUTS (Includes Matching and Balun Loss)
RF Output Frequency Range
Peak-to-Peak Gain Variation over
RF Band
4.9
At one temperature
3
_______________________________________________________________________________________ 5
MAX2850
AC ELECTRICAL CHARACTERISTICS—Rx MODE (continued)
MAX2850
5GHz, 4-Channel MIMO Transmitter
AC ELECTRICAL CHARACTERISTICS—Tx MODE (continued)
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, RF frequency = 5.351GHz, TA = -25NC to +85NC. LO frequency
= 5.35GHz. Reference frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, with power matching at TXRF+ and
TXRF- differential ports using the Typical Operating Circuit. 100mVRMS sine and cosine signal applied to I/Q baseband inputs of
transmitter (differential DC-coupled). Typical values measured at VCC = 2.85V, channel bandwidths of 40MHz, TA = +25NC.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
20MHz OFDM signal conforming to spectral emission
mask and -34dB EVM
-4
40MHz OFDM signal conforming to spectral emission
mask and -34dB EVM
-4
Output 1dB Gain Compression
Relative to typical maximum output power at 9.5MHz
input frequency
11
dBc
Input 1dB Gain Compression
At 19MHz input frequency, over input common-mode
voltage between 0.5V and 1.1V
380
mVRMS
Maximum Output Power
Gain-Control Range
dBm
26
31.5
34.5
dB
Gain-Control Step
0.5
dB
RF Output Return Loss
-3
dB
dBc
Unwanted Sideband
Over RF channel, RF frequency, baseband frequency,
and gain settings (Note 2)
-40
Carrier Leakage
Over RF channel, RF frequency, and gain settings
(Note 2)
-29
Minimum differential resistance
60
kI
Maximum differential capacitance
2
pF
At 30MHz frequency offset for 20MHz RF channel
86
At 60MHz frequency offset for 40MHz RF channel
67
Tx Calibration Ftone Level
At Tx gain code (Main address 9 D9:D4) = 100010 and
-15dBc carrier leakage (Local address 27 D2:D0 = 110
and Main address 1 D3:D0 = 0000)
-28
dBVRMS
Tx Calibration Gain Range
Adjust Local address 27 D2:D0
35
dB
Tx I/Q Input Impedance (R||C)
Baseband Filter Stopband
Rejection
-15
dBc
dB
AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, frequency = 5.35GHz, TA = -25NC to +85NC. Reference
frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low. Typical values measured at VCC = 2.85V, LO frequency =
5.35GHz, TA = +25NC.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
5.9
GHz
FREQUENCY SYNTHESIZER
RF Channel Center Frequency
4.9
Channel Center Frequency
Programming Step
Closed-Loop Integrated Phase
Noise
Loop BW = 200kHz, integrate phase noise from 1kHz to
10MHz
Charge-Pump Output Current
Spur Level
Reference Frequency
76.294
Hz
-35
dBc
0.8
mA
fOFFSET = 0 to 19MHz
-42
fOFFSET = 40MHz
-66
40
6 _______________________________________________________________________________________
dBc
MHz
5GHz, 4-Channel MIMO Transmitter
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, TA = -25NC to +85NC, frequency = 5.35GHz. Reference frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low; typical values measured at VCC = 2.85V, TA = +25NC, LO frequency = 5.35GHz.) (Note 1)
PARAMETER
CONDITIONS
Reference Frequency Input
Levels
AC-coupled to XTAL pin
MIN
Base-to-ground capacitance
Crystal Capacitance Tuning Step
CLKOUT Signal Level
MAX
800
Maximum Crystal Motional
Resistance
Crystal Capacitance Tuning
Range
TYP
VCC 0.8
10pF load capacitance
UNITS
mVP-P
50
I
30
pF
140
fF
VCC 0.1
VP-P
AC ELECTRICAL CHARACTERISTICS—MISCELLANEOUS BLOCKS
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, TA = -25NC to +85NC. Reference frequency = 40MHz, ENABLE
= high, CS = high, SCLK = DIN = low. Typical values measured at VCC = 2.85V, TA = +25NC.) (Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
11
30
mV
3.6
V
PA POWER DETECTOR MUX
Output-Voltage Drop
VIN = 2V, load resistance = 10kI to ground
PA ON/OFF CONTROL
VCC_PA Input Voltage Range
3.1
VCC_PA Supply Current
With 10mA load at PA_BIAS1 to PA_BIAS4
42
mA
Output High Level
10mA load current, Main address 11 D7:5 = 011
2.8
V
30
mV
25
mV
0.3
Fs
Output High-Level Variation
Between PA_BIAS1 to PA_BIAS4
Output Low Level
1mA load current, Main address 11 D7:5 = 011
Turn-On Time
Measured from CS rising edge
ON-CHIP TEMPERATURE SENSOR
Digital Output Code
Read-out at DOUT pin through
Main address 3 D4:D0
TA = +25NC
17
TA = +85NC
25
TA = -20NC
9
AC ELECTRICAL CHARACTERISTICS—TIMING
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, frequency = 5.35GHz, TA = -25NC to +85NC. Reference
frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low. Typical values measured at VCC = 2.85V, LO frequency =
5.35GHz, TA = +25NC.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
SYSTEM TIMING
Shutdown Time
2
Fs
Maximum Channel Switching
Time
Loop bandwidth = 200kHz, settling to within
Q1kHz from steady state
2
ms
Maximum Channel Switching
Time With Preselected VCO
Sub-Band
Loop bandwidth = 200kHz, settling to within
Q1kHz from steady state
56
Fs
_______________________________________________________________________________________ 7
MAX2850
AC ELECTRICAL CHARACTERISTICS—FREQUENCY SYNTHESIS (continued)
MAX2850
5GHz, 4-Channel MIMO Transmitter
AC ELECTRICAL CHARACTERISTICS—TIMING (continued)
(Operating conditions, unless otherwise specified: VCC = 2.7V~3.6V, frequency = 5.35GHz, TA = -25NC to +85NC,. Reference frequency = 40MHz, ENABLE = high, CS = high, SCLK = DIN = low, typical values measured at VCC = 2.85V, LO frequency = 5.35GHz,
TA = +25NC.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Measured
from CS rising edge
Rx/Tx Turnaround Time
MIN
TYP
Rx to Tx mode, Tx gain settles
to within 0.2dB of steady state
2
Tx to Rx mode with RXHP = 1,
Rx gain settles to within 0.5dB
of steady state
2
Tx Turn-On Time (from
Standby Mode)
Measured from CS rising edge, Tx gain settles
to within 0.2dB of steady state
Tx Turn-Off Time (to Standby
Mode)
From CS rising edge
Rx Turn-On Time (from
Standby Mode)
Measured from CS rising edge, Rx gain settles
to within 0.5dB of steady state
Rx Turn-Off Time (to Standby
Mode)
From CS rising edge
MAX
UNITS
Fs
2
Fs
0.1
Fs
2
Fs
0.1
Fs
4-WIRE SERIAL-INTERFACE TIMING (See Figure 1)
SCLK Rising Edge to CS
Falling Edge Wait Time
tCSO
6
ns
Falling Edge of CS to Rising
Edge of First SCLK Time
tCSS
6
ns
DIN to SCLK Setup Time
tDS
6
ns
DIN to SCLK Hold Time
tDH
6
ns
SCLK Pulse-Width High
tCH
6
ns
SCLK Pulse-Width Low
tCL
6
ns
Last Rising Edge of SCLK to
Rising Edge of CS or Clock to
Load Enable Setup Time
tCSH
6
ns
CS High Pulse Width
tCSW
50
ns
Time Between Rising Edge of
CS and the Next Rising Edge
of SCLK
tCS1
6
ns
SCLK Frequency
fCLK
40
MHz
Rise Time
tR
2.5
ns
Fall Time
tF
2.5
ns
SCLK Falling Edge to Valid
DOUT
tD
12.5
ns
Note 1: The MAX2850 is production tested at TA = +25NC; minimum/maximum limits at TA = +25NC are guaranteed by test, unless
specified otherwise. Minimum/maximum limits at TA = -25NC and +85NC are guaranteed by design and characterization.
There is no power-on register settings self-reset; recommended register settings must be loaded after VCC is applied.
Note 2: For optimal Rx and Tx quadrature accuracy over temperature, the user can utilize the Rx calibration and Tx calibration
circuit to assist quadrature calibration.
8 _______________________________________________________________________________________
5GHz, 4-Channel MIMO Transmitter
Rx NOISE FIGURE vs. VGA GAIN
SETTINGS (BALUN INPUT REFERRED)
MAX - 40dB
35
TA = -20°C
TA = +25°C
25
20
MAX - 16dB
15
134
10
133
5
132
MAX - 24dB
MAX
0
2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
60
TA = +25°C
40
30
10
TA = +85°C
0.60
LNA = MAX - 24dB
LNA = MAX - 40dB
5.9
2
10
4
6
8
12
14
BASEBAND VGA GAIN CODE
Rx EVM vs. INPUT POWER
(CHANNEL BANDWIDTH = 20MHz)
Rx EVM vs. Rx BASEBAND
OUTPUT LEVEL
12
MAX2850 toc07
LNA = MAX
-20
VGA GAIN = 2/4/6/8/10/12/14
10
-30
LNA = MAX = -16dB
LNA = MAX = -24dB
6
VGA GAIN =
3/5/7/9/11/13/15
-70
-50
INPUT POWER (dBm)
-10
10
4
8
10 12
6
BASEBAND VGA GAIN CODE
14
12
20MHz OFFSET
8
6
40MHz OFFSET
2
LNA = MAX = -32dB
-30
2
14
4
0
-90
0.35
10
2
-40
TA = +85°C
Rx EVM vs. OFDM JAMMER POWER AT
20MHz AND 40MHz OFFSET FREQUENCY
WITH WANTED SIGNAL AT -66dBm
8
4
-35
TA = +25°C
0.40
0
Rx EVM (%)
Rx EVM (%)
LNA = MAX = -40dB
LNA = MAX = -8dB
0.45
16
VGA GAIN = 0
-25
0.50
0.20
0
FREQUENCY (GHz)
-15
TA = -20°C
0.25
MAX2850 toc08
5.7
5.9
0.30
-10
5.5
5.7
0.55
LNA = MAX - 32dB
0
62
EVM (dB)
LNA = MAX - 16dB
20
65
5.5
MAX2850 toc09
GAIN (dB)
67
5.3
5.3
Rx OUTPUT V1dB vs. GAIN SETTING
LNA = MAX - 8dB
50
5.1
5.1
FREQUENCY (GHz)
LNA = MAX
70
68
4.9
LNA = MAX - 40dB
4.9
OUTPUT V1dB (VRMS)
69
MAXIMUM GAIN (dB)
80
MAX2850 toc04
TA = -20°C
63
30
Rx GAIN vs. BASEBAND VGA GAIN
71
64
LNA = MAX - 32dB
Rx VGA GAIN SETTINGS
Rx MAXIMUM GAIN vs.
TEMPERATURE AND FREQUENCY
66
LNA = MAX - 24dB
40
20
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
SUPPLY VOLTAGE (V)
70
LNA = MAX - 16dB
50
MAX - 8dB
MAX2850 toc05
136
LNA = MAX - 8dB
60
MAX2850 toc06
137
MAX - 32dB
30
LNA = MAX GAIN
70
MAXIMUM GAIN (dB)
138
135
40
80
MAX2850 toc02
TA = +85°C
139
NOISE FIGURE (dB)
SUPPLY CURRENT (mA)
140
Rx MAXIMUM GAIN vs. FREQUENCY
45
MAX2850 toc01
141
MAX2850 toc03
Rx MODE SUPPLY CURRENT
-30
-25
-20
-15
-10
-5
Rx BASEBAND OUTPUT LEVEL (dBVrms)
0
0
-40 -35 -30 -25 -20 -15 -10 -5
0
5
10
INPUT POWER (dBm)
_______________________________________________________________________________________ 9
MAX2850
Typical Operating Characteristics
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
Typical Operating Characteristics (continued)
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
Rx EMISSION SPECTRUM AT
LNA INPUT (LNA = MAX GAIN)
Rx INPUT IMPEDANCE
2LO
4LO
REAL PART (I)
(dBm)
-40
-50
-60
-70
-80
-90
-2
30
10
20
0
MAX - 40dB MAX - 32dB
10
-10
MAX GAIN
0
-20
MAX - 40dB
-10
-30
-4
-6
LNA = MAX
-8
-10
LNA = MAX - 32dB
-12
-14
LNA = MAX - 40dB
-16
-18
-100
-110
-20
2.65GHz/div
0
26.5
-40
4.80
5.00
5.20
5.40
5.60
5.80
-20
4900
6.00
Rx RF RSSI ATTACK TIME
(+40dB SIGNAL STEP)
Rx RF RSSI OUTPUT
MAX2850 toc13
LOW GAIN, TA = +85°C
2.0
LOW GAIN,
TA = +25°C
1.5
0V
HIGH GAIN,
TA = +85°C
1.0
0V
5700
5900
D: 216ns D: 1.30V
@: 128ns @: 460mV
1.0V/div
GAIN CONTROL
0V
1.0V/div
HIGH GAIN,
TA = +25°C
0.5
5500
MAX2850 toc15
D: 280ns D: 1.32V
@: 192ns @: 1.84V
1.0V/div
LOW GAIN,
TA = -20°C
5300
Rx RF RSSI DELAY TIME
(-40dB SIGNAL STEP)
MAX2850 toc14
2.5
5100
FREQUENCY (MHz)
RF FREQUENCY (GHz)
RF RSSI OUTPUT VOLTAGE (V)
MAX2850 toc12
MAX GAIN
Rx INPUT RETURN LOSS (dB)
-30
MAX - 32dB
0
20
IMAGINARY PART (I)
-20
Rx INPUT RETURN LOSS
MAX2850 toc11
40
MAX2850 toc10
-10
1.0V/div
VRSSI
GAIN CONTROL
VRSSI
0V
HIGH GAIN, TA = -20°C
0
-50 -45 -40 -35 -30 -25 -20 -15 -10 -5
0
400ns/div
400ns/div
Rx BASEBAND RSSI
+40dB STEP RESPONSE
Rx BASEBAND RSSI
-32dB STEP RESPONSE
RF INPUT POWER (dBm)
3.0
LNA = MAX
2.5
LNA = MAX - 40dB
MAX2850 toc16
BASEBAND RSSI VOLTAGE
vs. INPUT POWER
BASEBAND RSSI OUTPUT VOLTAGE (V)
MAX2850
5GHz, 4-Channel MIMO Transmitter
LNA = MAX - 8dB
2.0
MAX2850 toc17
0V
2.4V
1.5
0.8V
LNA =
MAX - 24dB
1.0
2.7V
2.7V
LNA GAIN CONTROL
RSSI OUTPUT
0V
2.0V
0.6V
LNA GAIN CONTROL
RSSI OUTPUT
LNA = MAX - 32dB
0.5
LNA = MAX - 16dB
0
-100
-80
-60
-40
-20
0
20
MAX2850 toc18
D: 1.18µs D: 1.62V
@: 1.16µs @: 480mV
D: 460ns D: 1.50V
@: 440ns @: 2.30V
1µs/div
RF INPUT POWER (dBm)
10 �������������������������������������������������������������������������������������
1µs/div
5GHz, 4-Channel MIMO Transmitter
GROUP DELAY (ns)
RESPONSE (dB)
RESPONSE (dB)
0
-135
-135
10k
100M
10k
BASEBAND FREQUENCY (Hz)
Rx LPF 40MHz CHANNEL
BANDWIDTH GROUP DELAY
100M
100M
FREQUENCY (Hz)
Rx DC OFFSET SETTLING RESPONSE
(-30dB Rx VGA GAIN STEP)
Rx DC OFFSET SETTLING RESPONSE
(+8dB Rx VGA GAIN STEP)
GAIN-CONTROL
TOGGLE
MAX2850 toc24
CH1 PEAK TO
PEAK: 81.9mV
0V
0V
Rx BASEBAND
I/Q OUTPUT
50mV/div
GROUP DELAY (ns)
10k
FREQUENCY (Hz)
MAX2850 toc23
MAX2850 toc22
100
MAX2850 toc21
100
MAX2850 toc20
-35
MAX2850 toc19
-35
Rx LPF 20MHz CHANNEL
BANDWIDTH GROUP DELAY
Rx LPF 40MHz CHANNEL BANDWIDTH
RESPONSE
Rx LPF 20MHz CHANNEL BANDWIDTH
RESPONSE
CH1 PEAK TO
PEAK: 8.60mV
GAIN-CONTROL
TOGGLE
10mV/div
Rx BASEBAND
I/Q OUTPUT
0
10k
100M
FREQUENCY (Hz)
Rx DC OFFSET SETTLING RESPONSE
(+16dB Rx VGA GAIN STEP)
MAX2850 toc25
0V
200ns/div
Rx DC OFFSET SETTLING RESPONSE
(+32dB Rx VGA GAIN STEP)
Rx BASEBAND DC OFFSET SETTLING
RESPONSE WITH RxHP = 1
(MAX - 40dB TO MAX LNA GAIN STEP)
MAX2850 toc27
MAX2850 toc26
GAIN-CONTROL TOGGLE
CH1 PEAK TO
PEAK: 17.3mV
GAIN-CONTROL
TOGGLE
200ns/div
CH1 PEAK TO
PEAK: 69.0mV
GAIN-CONTROL
TOGGLE
0V
Rx BASEBAND
I/Q OUTPUT
10mV/div
Rx BASEBAND
I/Q OUTPUT
Rx BASEBAND
I/Q OUTPUT
0V
10mV/div
50mV/div
200ns/div
200ns/div
10µs/div
______________________________________________________________________________________ 11
MAX2850
Typical Operating Characteristics (continued)
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
MAX2850
5GHz, 4-Channel MIMO Transmitter
Typical Operating Characteristics (continued)
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
Rx BASEBAND DC OFFSET SETTLING
RESPONSE WITH RxHP = 0
(MAX TO MAX - 40dB LNA GAIN STEP)
Rx BASEBAND DC OFFSET SETTLING
RESPONSE WITH RxHP = 1
(MAX - 40dB TO MAX LNA GAIN STEP)
MAX2850 toc28
MAX2850 toc29
MAX2850 toc30
GAIN-CONTROL
TOGGLE
GAIN-CONTROL
TOGGLE
Rx BASEBAND
I/Q OUTPUT
0V
Rx BASEBAND
I/Q OUTPUT
0V
10mV/div
Rx BASEBAND
I/Q OUTPUT
0V
50mV/div
GAIN-CONTROL
TOGGLE
50mV/div
10µs/div
10µs/div
10µs/div
Rx BASEBAND VGA SETTLING
RESPONSE (-30dB BASEBAND
VGA GAIN STEP)
Rx BASEBAND VGA SETTLING
RESPONSE (+4dB BASEBAND
VGA GAIN STEP)
Rx BASEBAND VGA SETTLING
RESPONSE (+16dB BASEBAND
VGA GAIN STEP)
MAX2850 toc31
MAX2850 toc32
GAIN-CONTROL
TOGGLE
Rx BASEBAND
I/Q OUTPUT
0V
0.1V/div
MAX2850 toc33
CH1 PEAK TO
PEAK: 568mV
GAIN-CONTROL
TOGGLE
CH1 PEAK TO
PEAK : 652mV
CH1 PEAK TO
PEAK: 532mV
Rx BASEBAND
OUTPUT
0V
Rx BASEBAND
OUTPUT
0V
0.1V/div
0.1V/div
GAIN-CONTROL
TOGGLE
100ns/div
100ns/div
100ns/div
Rx BASEBAND VGA SETTLING
RESPONSE (+30dB BASEBAND
VGA GAIN STEP)
Rx LNA SETTLING RESPONSE
(MAX TO MAX - 40dB GAIN STEP)
Rx LNA SETTLING RESPONSE
(MAX - 8dB TO MAX GAIN STEP)
MAX2850 toc34
MAX2850 toc35
CH1 RMS:
168mV
GAIN-CONTROL
TOGGLE
GAIN-CONTROL
TOGGLE
0.1V/div
MAX2850 toc36
D: 130mv
@: 132mv
CH1 PEAK TO
PEAK: 800mV
CLIPPING NEGATIVE
Rx BASEBAND
OUTPUT
0V
Rx BASEBAND DC OFFSET SETTLING
RESPONSE WITH RxHP = 0
(MAX - 40dB TO MAX LNA GAIN STEP)
GAIN-CONTROL
TOGGLE
0V
Rx BASEBAND
OUTPUT
0V
0.1V/div
0.1V/div
Rx BASEBAND
OUTPUT
D: 130mv
@: 132mv
CH1 RMS:
188mV
100ns/div
100ns/div
12 �������������������������������������������������������������������������������������
100ns/div
5GHz, 4-Channel MIMO Transmitter
Rx LNA SETTLING RESPONSE
(MAX - 16dB TO MAX GAIN STEP)
Rx LNA SETTLING RESPONSE
(MAX - 24dB TO MAX GAIN STEP)
MAX2850 toc37
Rx LNA SETTLING RESPONSE
(MAX - 32dB TO MAX GAIN STEP)
MAX2850 toc38
CH1 RMS: 176mV
MAX2850 toc39
CH1 RMS: 174mV
GAIN-CONTROL
TOGGLE
Rx BASEBAND
OUTPUT
Rx BASEBAND
OUTPUT
CH1 RMS: 155mV
GAIN-CONTROL
TOGGLE
Rx BASEBAND
OUTPUT
0V
0V
0V
0.1V/div
0.1V/div
0.1V/div
D: 130mv
@: 132mv
D: 130mv
@: 132mv
100ns/div
GAIN-CONTROL
TOGGLE
D: 130mv
@: 132mv
100ns/div
Rx LNA SETTLING RESPONSE
(MAX - 40dB TO MAX GAIN STEP)
MAX2850 toc40
200ns/div
HISTOGRAM: Rx I/Q GAIN IMBALANCE
MAX2850 toc41
648
HISTOGRAM: Rx I/Q PHASE IMBALANCE
MAX2850 toc42
180
CH1 RMS: 154mV
Rx BASEBAND
OUTPUT
GAIN-CONTROL
TOGGLE
0V
0.1V/div
D: 130mv
@: 132mv
540
150
432
120
324
90
216
60
108
30
0
0
200ns/div
HISTOGRAM: Rx STATIC DC OFFSET
132
MAX2850 toc43
-800.00m
0
800.00m
SAMPLES = 3413, AVG = -0.015dB,
STDEV = 0.042dB
-2.0000
0
2.0000
SAMPLES = 3413, AVG = -0.15deg,
STDEV = 0.18deg
POWER-ON DC OFFSET CANCELLATION
WITH INPUT SIGNAL
POWER-ON DC OFFSET CANCELLATION
WITHOUT INPUT SIGNAL
MAX2850 toc44
MAX2850 toc45
D: 2.14µs D: 112mV
@: 2.12µs @: 104mV
110
Rx ENABLE
88
0V
2V/div
66
Rx BASEBAND OUTPUT
22
RXBB_I
50mV/div
TURN-ON
TRANSIENT
RXBB_Q
500mV/div
0V
0.1V/div
44
Rx ENABLE
ENGAGE 600kHz
HIGHPASS CORNER
0
-15.000m
0
15.000m
SAMPLES = 3413, AVG = -0.5mV,
STDEV = 2.14mV
1µs/div
400ns/div
______________________________________________________________________________________ 13
MAX2850
Typical Operating Characteristics (continued)
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
Typical Operating Characteristics (continued)
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
QUAD Tx SUPPLY CURRENT
vs. SUPPLY VOLTAGE
192
191
TA = -20°C
190
189
188
0
RFBW = 40MHz
TA = +25°C
515
-20
TA = -20°C
RFBW = 20MHz
(dB)
SUPPLY CURRENT (mA)
193
TA = +85°C
520
SUPPLY CURRENT (mA)
TA = +25 AND +85°C
194
20
MAX2850 toc47
195
Tx BASEBAND RESPONSE
525
MAX2850 toc46
196
MAX2850 toc48
SINGLE Tx SUPPLY CURRENT
vs. SUPPLY VOLTAGE
510
-40
505
-60
500
-80
187
495
2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
BASEBAND FREQUENCY (Hz)
TX2 OUTPUT RETURN LOSS
vs. FREQUENCY
OUTPUT RETURN LOSS AT
TA = +25°C vs. Tx CHANNELS
TX2 OUTPUT POWER AT MAXIMUM
GAIN vs. RF FREQUENCY
TX4
-6
TX3
-7
MAX2850 toc53
-10
5900
5800
5700
5600
5500
5400
5300
5200
5100
5000
FREQUENCY (MHz)
MAX2850 toc51
5800
5700
5600
5500
5800
5900
5700
5600
5500
5400
-5
TA = +25°C
-0.3
TA = -20°C
TA = -20°C
-15
-20
TA = +85°C
-25
TA = +25°C
-30
-0.4
-0.5
-0.6
-0.7
-35
4900
-8
-0.2
GAIN STEP (dB)
-4
TX2
Tx GAIN STEP vs. GAIN SETTING
Tx OUTPUT POWER vs. GAIN SETTING
OUTPUT POWER (dBm)
-3
RF FREQUENCY (MHz)
0
MAX2850 toc52
-2
TX1
5300
FREQUENCY (MHz)
Tx OUTPUT POWER vs. Tx CHANNELS
(GAIN = MAX - 3dB, 40MHz MODE,
100mVRMS BB INPUT)
-5
-6
MAX2850 toc54
FREQUENCY (MHz)
5200
5900
5700
5100
5500
5000
5300
4900
-25
5100
5400
-5
-16
4900
TA = +85°C
-4
TX1
-20
-18
-3
5300
-14
TX3
5100
-12
TX2
-15
5200
-10
TA = +25°C
-2
5000
TA = +25°C
-10
TA = -20°C
-1
4900
TA = +85°C
-8
TX4
1.00E+08
0
OUTPUT POWER (dBm)
-6
-5
RETURN LOSS (dB)
-4
1.00E+07
1
MAX2850 toc50
TA = -20°C
-2
0
MAX2850 toc49
0
RETURN LOSS (dB)
-100
1.00E+06
2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
5900
186
OUTPUT POWER (dBm)
MAX2850
5GHz, 4-Channel MIMO Transmitter
TA = +85°C
-40
-0.8
0
10
20
30
40
50
Tx GAIN CODE
60
70
0
10
20
30
40
Tx GAIN CODE
14 �������������������������������������������������������������������������������������
50
60
70
5GHz, 4-Channel MIMO Transmitter
TA = +25°C
-32
TA = -20°C
TA = +85°C
-34
-36
-18
MAX2850 toc56
TA = -20°C
0
OUTPUT POWER (dBm)
-30
EVM (dB)
2
MAX2850 toc55
-28
TX2 OUTPUT SPECTRUM AT -5dBM
(20MHz CHANNEL BANDWIDTH,
802.11a 54Mbps)
Tx MAX OUTPUT POWER MEETING -33dB
EVM AND 802.11a SPECTRAL MASK
MAX2850 toc57
Tx EVM vs. OUTPUT POWER
(100mVRMS 54Mbps WLAN SIGNAL)
0dBr
-28
-38
-48
-2
10dB/div
-40dBr
TA = +85°C
-4
TA = +25°C
-58
-68
-78
-6
-88
-8
-20
-15
-10
-5
5300
5500
5900
5700
5300
Tx CARRIER LEAKAGE vs. GAIN SETTING
Tx UNWANTED SIDEBAND
vs. RF FREQUENCY
-30
-45
TA = +25°C
-50
-55
-65
70
RF FREQUENCY (MHz)
Tx CHANNEL ISOLATION
3 x LO
4 x LO
5 x LO
OUTPUT
POWER
(dBm/MHz)
TA = -20°C
-30
TX1 TO 4
-35
MAX2850 toc63
LO
2 x LO
5700
60
TX1 TO 2
-40
ISOLATION (dB)
0dBm
TA = +25°C
-35
TA = -20°C
5600
30
40
50
Tx GAIN CODE
MAX2850 toc62
MAX2850 toc61
-30
20
5500
10
5400
0
Tx OUTPUT EMISSION SPECTRUM AT
MAX GAIN AND COLD
(100mVRMS 802.11a 54Mbps SIGNAL)
TA = +85°C
TA = +25°C
-55
5300
5900
5800
5700
5600
5500
5400
5300
5200
5100
5000
-65
RF FREQUENCY (MHz)
-25
-50
-60
-60
Tx UNWANTED SIDEBAND
vs. GAIN SETTING
-45
5200
-60
-40
TA = +85°C
-40
5100
-55
TA = -20°C
-35
-35
5000
TA = +85°C
TA = +25°C
TA = +85°C
4900
MAX2850 toc58
-25
CARRIER LEAKAGE (dBc)
-50
4900
5400
Tx CARRIER LEAKAGE
vs. RF FREQUENCY
-45
-40
5350
RF FREQUENCY (MHz)
-40
TX2 TO 4
-45
TX3 TO 4
TX4 TO 3
-50
-55
-60
-65
-70
-45
Tx GAIN CODE
0
2.65GHz/div
RF FREQUENCY (GHz)
26.5
5900
-80
-100dBm
5800
70
5700
60
5600
50
5500
40
5400
30
5300
20
5200
10
5100
0
5000
-75
-50
4900
UNWANTED SIDEBAND (dBc)
5100
RF FREQUENCY (MHz)
TA = -20°C
-65
-98
4900
OUTPUT POWER (dBm)
-35
CARRIER LEAKAGE (dBc)
0
MAX2850 toc60
-25
5900
-30
UNWANTED SIDEBAND (dBc)
-35
MAX2850 toc59
-40
5800
-38
RF FREQUENCY (MHz)
______________________________________________________________________________________ 15
MAX2850
Typical Operating Characteristics (continued)
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
Typical Operating Characteristics (continued)
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
HISTOGRAM: SIDEBAND SUPPRESSION
MAX2850 toc64
CLOCKOUT MODE SUPPLY CURRENT
MAX2850 toc65
156
4.5
MAX2850 toc66
HISTOGRAM: CARRIER SUPPRESSION
102
TA = +85°C
68
104
51
78
34
52
17
26
3.5
-62.000
-44.000
-26.000
SAMPLES = 3413, AVG = -44.6dBc,
STDEV = 2.58dB
LO FREQUENCY vs. DIFFERENTIAL
TUNE VOLTAGE AT TA = +25°C
LO GAIN vs. DIFFERENTIAL
TUNE VOLTAGE AT TA = +25°C
5.0
2.6 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6
SUPPLY VOLTAGE (V)
LO PHASE NOISE AT 5350MHz AND ROOM
TEMPERATURE
400
300
200
4.5
100
4.0
0
-50
-60
-70
PHASE NOISE (dBc/Hz)
500
LO GAIN (MHz/V)
5.5
2.0
MAX2850 toc68
600
MAX2850 toc67
6.0
TA = -20°C
3.0
0
6.5
TA = +25°C
2.5
-50.000
-34.000
-18.000
SAMPLES = 3413, AVG = -34.9dBc,
STDEV = 3.61dB
7.0
LO FREQUENCY (GHz)
4.0
MAX2850 toc69
130
SUPPLY CURRENT (mA)
85
0
-80
-90
-100
-110
-120
-130
-140
0
0.5
1.0
1.5
2.0
2.5
0
0.5
1.0
1.5
2.0
2.5
-150
1k
10M
DIFFERENTIAL TUNE VOLTAGE (V)
DIFFERENTIAL TUNE VOLTAGE (V)
OFFSET FREQUENCY (Hz)
LO PHASE NOISE AT 5900MHz AND HOT
TEMPERATURE
CHANNEL SWITCHING FREQUENCY
SETTLING (4900MHz TO 5900MHz,
AUTOMATIC VCO SUB-BAND SELECTION)
CHANNEL SWITCHING FREQUENCY
SETTLING (5900MHz TO 4900MHz,
AUTOMATIC VCO SUB-BAND SELECTION)
FREQUENCY (5kHz/div)
-80
-90
-100
-110
-120
25kHz
MAX2850 toc72
-70
25kHz
FREQUENCY (5kHz/div)
-60
MAX2850 toc71
MAX2850 toc70
-50
PHASE NOISE (dBc/Hz)
MAX2850
5GHz, 4-Channel MIMO Transmitter
-130
-140
-150
1k
10M
OFFSET FREQUENCY (Hz)
-25kHz
-25kHz
0s
3.99ms
400us/div
0s
3.99ms
400us/div
16 �������������������������������������������������������������������������������������
5GHz, 4-Channel MIMO Transmitter
CHANNEL SWITCHING FREQUENCY
SETTLING (4900MHz TO 5900MHz,
MANUAL VCO SUB-BAND SELECTION)
-25kHz
0s
99.22µs
FREQUENCY ERROR (10kHz/div)
-50kHz
-25kHz
0s
0s
99.22µs
10µs/div
49.84µs
5µs/div
10µs/div
CRYSTAL OSCILLATOR TUNING RANGE
WITH KYOCERA 40MHz 2520 CRYSTAL
Rx-TO-Tx TURNAROUND FREQUENCY
SETTLING AT MAX Tx POWER
-50kHz
0s
MAX2850 toc77
100
FREQUENCY DEVIATION FROM 40MHz (ppm)
FREQUENCY ERROR (10kHz/div)
MAX2850 toc76
50kHz
80
60
40
TA = +25°C
20
TA = +85°C
0
-20
-40
TA = -20°C
-60
-80
-100
49.84µs
0
50
100
150
200
250
300
5µs/div
CRYSTAL TUNING CODE
CRYSTAL OSCILLATOR TUNING STEP
WITH KYOCERA 2520 40MHz CRYSTAL
CRYSTAL OSCILLATOR TUNING
CAPACITANCE AT BASE AND EMITTER
(INCLUDE EV KIT COMPONENTS)
1.5
1.0
0.5
0
-0.5
0
50
100
150
200
XTAL TUNING CODE
250
300
MAX2850 toc79
2.0
140
CAPACITANCE AT BASE AND EMITTER (pF)
2.5
MAX2850 toc78
CRYSTAL OSCILLATOR FREQUENCY TUNING STEP
(ppm)
MAX2850 toc75
50kHz
FREQUENCY (5kHz/div)
FREQUENCY (5kHz/div)
Tx-TO-Rx TURNAROUND FREQUENCY
SETTLING AT MAX Tx POWER
MAX2850 toc74
25kHz
MAX2850 toc73
25kHz
CHANNEL SWITCHING FREQUENCY
SETTLING (5900MHz TO 4900MHz,
MANUAL VCO SUB-BAND SELECTION)
120
EMITTER-TO-GROUND
CAPACITANCE
100
80
BASE-TO-GROUND
CAPACITANCE
60
40
20
0
0
50
100
150
200
250
300
CRYSTAL TUNING CODE
______________________________________________________________________________________ 17
MAX2850
Typical Operating Characteristics (continued)
(VCC = 2.8V, fLO = 5.35GHz, fREF = 40MHz, CS = high, SCLK = DIN = low, RF BW = 20MHz, Tx output at 50I unbalanced output of
balun, TA = +25NC, using the MAX2850 Evaluation Kit.)
5GHz, 4-Channel MIMO Transmitter
TXBBI3+
TXBBI3-
TXBBQ3+
TXBBQ3-
RXBBI+
RXBBI-
RXBBQ+
RXBBQ-
RSSI
VCC_VCO
BYP_VCO
GND_VCO
CPOUT+
CPOUT-
VCC_DIG
CLKOUT
TOP VIEW
DOUT
MAX2850
Pin Configuration
51 50 49 48 47 46 45 44 43 42 41 40 39 38 37 36 35
VCC_XTAL 52
34 DIN
XTAL 53
33 SCLK
XTAL_CAP 54
32 CS
ENABLE 55
31 TXBBQ4-
TXBBI2+ 56
30 TXBBQ4+
TXBBI2- 57
29 TXBBI4-
TXBBQ2+ 58
28 TXBBI4+
TXBBQ2- 59
27 VCC_BB2
VCC_BB1 60
26 VCC_MXR
MAX2850
TXBBI1+ 61
25 RXRF+
TXBBI1- 62
24 RXRF-
TXBBQ1+ 63
23 VCC_LNA
TXBBQ1- 64
22 PA_DET4
PA_DET1 65
21 TXRF4-
TXRF1+ 66
20 TXRF4+
TXRF1- 67
19 PA_BIAS4
PA_BIAS1 68
VCC_UCX1
PA_DET2
GND
TXRF2+
TXRF2-
GND
PA_BIAS2
VCC_PA_BIAS
10 11 12 13 14 15 16 17
VCC_UCX4
9
VCC_UCX3
8
GND
7
PA_DET3
6
TXRF3-
5
TXRF3+
4
PA_BIAS3
3
VCC_LO
2
VCC_UCX2
18 GND
1
TQFN
10mm x 10mm
Pin Description
PIN
NAME
1
VCC_UCX1
Transmitter 1 Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin.
2
VCC_UCX2
Transmitter 2 Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin.
3
PA_DET2
External Power-Amplifier Detector Mux Input 2
4
GND
5
TXRF2+
6
TXRF2-
7
GND
8
PA_BIAS2
9
VCC_PA_BIAS
10
VCC_LO
11
PA_BIAS3
12
TXRF3+
13
TXRF3-
14
PA_DET3
FUNCTION
Ground
Transmitter 2 Differential Output. These pins are in open-collector configuration. These pins should
be biased at the supply voltage with differential impedance terminated at 300I.
Ground
External Power-Amplifier Voltage Bias Output 2
External Power-Amplifier Voltage Bias and Detector Mux Supply Voltage. Bypass with a capacitor as
close as possible to the pin.
LO Generation Supply Voltage. Bypass with a capacitor as close as possible to the pin.
External Power-Amplifier Voltage Bias Output 3
Transmitter 3 Differential Output. These pins are in open-collector configuration. These pins should
be biased at the supply voltage with differential impedance terminated at 300I.
External Power Amplifier Detector Mux Input 3
18 �������������������������������������������������������������������������������������
5GHz, 4-Channel MIMO Transmitter
PIN
NAME
FUNCTION
15
GND
16
VCC_UCX3
Transmitter 3 Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin.
Ground
17
VCC_UCX4
Transmitter 4 Upconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin.
18
GND
19
PA_BIAS4
20
TXRF4+
21
TXRF4-
22
PA_DET4
External Power-Amplifier Detector Mux Input 4
Receiver LNA Supply Voltage. Bypass with a capacitor as close as possible to the pin.
Ground
External Power-Amplifier Voltage Bias Output 4
Transmitter 4 Differential Output. These pins are in open-collector configuration. These pins should
be biased at the supply voltage with differential impedance terminated at 300I.
23
VCC_LNA
24
RXRF-
25
RXRF+
26
VCC_MXR
Receiver Downconverter Supply Voltage. Bypass with a capacitor as close as possible to the pin.
27
VCC_BB2
Receiver Baseband Supply Voltage 2. Bypass with a capacitor as close as possible to the pin.
28
TXBBI4+
29
TXBBI4-
30
TXBBQ4+
31
TXBBQ4-
32
33
CS
SCLK
34
DIN
35
TXBBI3+
36
TXBBI3-
37
TXBBQ3+
38
TXBBQ3-
39
RXBBI+
40
RXBBI-
41
RXBBQ+
42
RXBBQ-
43
RSSI
44
VCC_VCO
VCO Supply Voltage. Bypass with a capacitor as close as possible to the pin.
45
BYP_VCO
On-Chip VCO Regulator Output Bypass. Bypass with an external 1FF capacitor to GND_VCO with
minimum PCB trace. Do not connect other circuitry to this pin.
46
GND_VCO
VCO Ground
Receiver LNA Differential Input. Input is DC-coupled and biased internally at 1.2V.
Transmitter 4 Baseband I-Channel Differential Input
Transmitter 4 Baseband Q-Channel Differential Input
Chip-Select Logic Input of 4-Wire Serial Interface
Serial-Clock Logic Input of 4-Wire Serial Interface
Data Logic Input of 4-Wire Serial Interface
Transmitter 3 Baseband I-Channel Differential Input
Transmitter 3 Baseband Q-Channel Differential Input
Receiver Baseband I-Channel Differential Output
Receiver Baseband Q-Channel Differential Output
Receiver Signal-Strength Indicator Output
47
CPOUT+
48
CPOUT-
Differential Charge-Pump Output. Connect the frequency synthesizer’s loop filter between CPOUT+
and CPOUT- (see the Typical Operating Circuit).
49
VCC_DIG
Digital Block Supply Voltage. Bypass with a capacitor as close as possible to the pin.
50
DOUT
Data Logic Output of 4-Wire Serial Interface
51
CLKOUT
Reference Clock Buffer Output
52
VCC_XTAL
Crystal Oscillator Supply Voltage. Bypass with a capacitor as close as possible to the pin.
53
XTAL
54
XTAL_CAP
55
ENABLE
Crystal Oscillator Base Input. AC-couple crystal unit to this pin.
Crystal Oscillator Emitter Node
Enable Logic Input
______________________________________________________________________________________ 19
MAX2850
Pin Description (continued)
MAX2850
5GHz, 4-Channel MIMO Transmitter
Pin Description (continued)
PIN
NAME
56
TXBBI2+
57
TXBBI2-
58
TXBBQ2+
59
TXBBQ2-
60
VCC_BB1
61
TXBBI1+
62
TXBBI1-
63
TXBBQ1+
64
TXBBQ1-
65
PA_DET1
66
TXRF1+
67
TXRF1-
68
PA_BIAS1
—
EP
FUNCTION
Transmitter 2 Baseband I-Channel Differential Input
Transmitter 2 Baseband Q-Channel Differential Input
Receiver Baseband Supply Voltage 1. Bypass with a capacitor as close as possible to the pin.
Transmitter 1 Baseband I-Channel Differential Input
Transmitter 1 Baseband Q-Channel Differential Input
External Power-Amplifier Detector Mux Input 1
Transmitter 1 Differential Output. These pins are in open-collector configuration. These pins should
be biased at the supply voltage with differential impedance terminated at 300I.
External Power-Amplifier Voltage Bias Output 1
Exposed Pad. Connect to the ground plane with multiple vias for proper operation and heat dissipation. Do not share with any other pin grounds and bypass capacitors’ ground.
Table 1. Operating Modes
MODE CONTROL
LOGIC INPUTS
CIRCUIT BLOCK STATES
MODE
ENABLE
PIN
SPI MAIN
ADDRESS 0,
D4:D2
Rx PATH
Tx PATH
(Note 4)
LO PATH
CLKOUT
(Note 5)
Calibration
Sections On
SHUTDOWN
0
XXX
Off
Off
Off
Off
None
CLKOUT
1
000
Off
Off
Off
On
None
STANDBY
1
001
Off
Off
On
On
None
Rx
1
010
On
Off
On
On
None
Tx
1
011
Off
On
On
On
None
AM detector
+ Rx I/Q buffers
Tx CALIBRATION
1
100
Off
On
On
On
RF LOOPBACK
1
101
On (except LNA)
On
On
On
RF loopback
On
Tx 4 baseband
buffer
BASEBAND
LOOPBACK
1
11X
On (except RXRF)
Off
On
Note 4: PA_BIAS pins may be kept active in nontransmit mode(s) by SPI programming.
Note 5: CLKOUT signal is active independent of SPI, and is only dependent on the ENABLE pin.
Detailed Description
Modes of Operation
The modes of operation for the MAX2850 are shutdown,
clockout, standby, receive, transmit, transmitter calibration, RF loopback, and baseband loopback. See Table 1
for a summary of the modes of operation. The logic input
pin ENABLE (pin 55) and SPI Main address 0 D4:D2
control the various modes.
Shutdown Mode
The MAX2850 features a low-power shutdown mode. All
circuit blocks are powered down, except the 4-wire serial
bus and its internal programmable registers.
20 �������������������������������������������������������������������������������������
5GHz, 4-Channel MIMO Transmitter
Standby Mode
In standby mode, PLL, VCO, and LO generation are on.
Tx or Rx modes can be quickly enabled from this mode.
Other blocks may be selectively enabled in this mode.
Receive (Rx) Mode
In receive mode, all Rx circuit blocks are powered on
and active. Antenna signal is applied; RF is downconverted, filtered, and buffered at Rx baseband I and Q
outputs.
Transmit (Tx) Mode
In transmit mode, all Tx circuit blocks are powered on
and active. The external PA can be powered on through
the PA_BIAS pins after a programmable delay.
Transmit Calibration
In transmit calibration mode, all Tx circuit blocks are
powered on and active. The AM detector and receiver
I/Q channel buffers are also on. Output signals are
routed to Rx baseband I and Q outputs.
The AM detector multiplies the Tx RF output signal with
itself. The self-mixing product of the wanted sideband
becomes DC voltage and is filtered on-chip. The mixing product between wanted sideband and the carrier
leakage forms Ftone at Rx baseband output. The mixing
product between the wanted sideband and the unwanted sideband forms 2Ftone at Rx baseband output.
As Tx RF output is self-mixed at the AM detector, the
AM detector output responds differently to different gain
settings and power levels. When Tx RF output power
changes by 1dB through Tx gain control, the AM detector
output changes by 2dB as both the wanted sideband and
carrier leakage (or unwanted sideband) change by 1dB.
When Tx RF output carrier leakage (or unwanted sideband) changes by 1dB while the wanted sideband output
power is constant, the AM detector output changes by
1dB only.
RF Loopback
In RF loopback mode, part of the Rx and Tx circuit
blocks except the LNA are powered on and active. The
transmitter 4 I/Q input signal is upconverted to RF, and
the output of the transmitter is fed to the receiver downconverter input. Output signals are delivered to receiver
4 baseband I/Q outputs. The I/Q lowpass filters in the
transmitter signal path are bypassed.
Baseband Loopback
In baseband loopback mode, part of the Rx and Tx
baseband circuit blocks are powered and active. The
transmitter 4 I/Q input signal is routed to receiver lowpass filter input. Output signals are delivered to receiver
4 baseband I/Q outputs.
Power-On Sequence
Set the ENABLE pin to VCC for 2ms to start the crystal
oscillator. Program all SPI addresses according to recommended values. Set SPI Main address 0 D4:D2 from
000 to 001 to engage standby mode. To lock the LO
frequency, the user can set SPI in order of Main address
15, Main address 16, and then Main address 17 to trigger VCO sub-band autoacquisition; the acquisition will
take 2ms. After the LO frequency is locked, set SPI Main
address 0 D4:D2 = 010 and 011 for Rx and Tx operating modes, respectively. Before engaging Rx mode, set
Main address 5 D1 = 1 to allow fast DC offset settling.
After engaging Rx mode and Rx baseband DC offset
settles, the user can set Main address 5 D1 = 0 to complete Rx DC offset cancellation.
Programmable Registers and
4-Wire SPI Interface
The MAX2850 includes 60 programmable 16-bit registers. The most significant bit (MSB) is the read/write
selection bit (R/W in Figure 1). The next 5 bits are register
address (A4:A0 in Figure 1). The 10 least significant bits
(LSBs) are register data (D9:D0 in Figure 1). Register
data is loaded through the 4-wire SPI/MICROWIRE™compatible serial interface. MSB of data at the DIN pin
is shifted in first and is framed by CS. When CS is low,
the clock is active, and input data is shifted at the rising
edge of the clock at SCLK pin. At the CS rising edge,
the 10-bit data bits are latched into the register selected
by address bits. See Figure 1. To support more than a
32-register address using a 5-bit wide address word,
the bit 0 of address 0 is used to select whether the 5-bit
address word is applied to the main address or local
address. The register values are preserved in shutdown
mode as long as the power-supply voltage is maintained.
There is no power-on SPI register self-reset functionality
in the MAX2850, so the user must program all register
values after power-up. During the read mode, register
data selected by address bits is shifted out to the DOUT
pin at the falling edges of the clock.
MICROWIRE is a trademark of National Semiconductor Corp.
______________________________________________________________________________________ 21
MAX2850
Clockout Mode
In clockout mode, only the crystal oscillator signal is
active at the CLKOUT pin. The rest of the transceiver is
powered down.
MAX2850
5GHz, 4-Channel MIMO Transmitter
tCSW
CS
tCSO
tCSH
tCSS
tCS1
SCLK
tDS
DIN
(SPI WRITE)
DIN
(SPI READ)
tCH
tDH
tCL
R/W
A4
A0
D9
D0
DON’T CARE
R/W
A4
A0
D9
D0
DON’T CARE
tD
DOUT
(SPI READ)
DON’T CARE
D9
D0
DON’T CARE
Figure 1. 4-Wire SPI Serial-Interface Timing Diagram
SPI Register Definition
(All values in the register summary table are typical numbers. The MAX2850 SPI does not have a power-on-default selfreset feature; the user must program all SPI addresses for normal operation. Prior to use of any untested settings, contact
the factory.)
Table 2. Register Summary
READ/WRITE AND ADDRESS
REGISTER
Main0_
D0
Main0
Main1
Main2
Main3
0
0
0
0
A4:A0
00000
00001
00010
00011
WRITE (W)/
READ (R)
DATA
D9
D8
D7
1
W/R
RESERVED
Default
0
1
W/R
RESERVED
RESERVED
D6
D5
D4
1
0
E_TX<4:1>
0
0
1
RESERVED
RESERVED
RESERVED
1
0
1
RESERVED
RESERVED
R
RESERVED
RESERVED
Default
0
0
0
0
LNA_GAIN<2:0>
W/R
W
D2
MODE<2:0>
1
Default
Default
D3
1
TS_EN
TS_TRIG
0
0
D0
RFBW
M/L_SEL
1
0
1
1
RX_VGA<4:0>
1
LNA_BAND<1:0>
0
D1
1
1
1
RESERVED
RESERVED
RESERVED
1
0
0
0
RESERVED
RESERVED
RESERVED
RESERVED
0
0
RESERVED
0
RESERVED RESERVED
0
0
RESERVED RESERVED
TS_READ<4:0>
0
22 �������������������������������������������������������������������������������������
0
0
5GHz, 4-Channel MIMO Transmitter
READ/WRITE AND ADDRESS
REGISTER
Main0_
D0
Main4
0
A4:A0
00100
WRITE (W)/
DATA
D9
D8
Reserved
1
1
W/R
RESERVED
Default
0
0
0
READ (R)
D7
D6
0
0
D5
D4
D3
D2
D1
D0
0
1
1
1
0
0
RESERVED
RESERVED
RESERVED
RESERVED
RXHP
RESERVED
0
0
0
0
0
0
0
RSSI_MUX_SEL<2:0>
Main5
0
00101
Main6
0
00110
Reserved
1
1
1
1
1
0
1
0
0
0
Main7
0
00111
Reserved
0
0
0
0
1
0
0
1
0
0
Main8
0
01000
W/R
0
0
0
0
0
0
0
0
0
0
Main9
0
01001
Main10
0
01010
Main11
0
01011
Main13
0
01101
Main14
Main15
0
0
01110
01111
W/R
Main17
Main18
0
0
0
10000
10001
10010
Default
0
0
0
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
W/R
RESERVED
RESERVED
RESERVED
RESERVED
Default
0
0
1
0
Reserved
0
0
W/R
RESERVED
RESERVED
0
1
Default
W/R
VAS_
0
1
0
0
RESERVED RESERVED
0
1
0
0
0
1
1
1
0
1
Default
0
0
W/R
RESERVED
RESERVED
0
0
Default
0
0
1
W/R
RESERVED
RESERVED
RELOCK_
0
0
0
0
0
0
0
0
RESERVED
RESERVED
RESERVED
DOUT_SEL
RESERVED
1
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
0
0
0
XTAL_TUNE<7:0>
0
0
0
VAS_
VAS_ADC<2:0>
0
0
0
1
Reserved
0
1
Read
RESERVED
RESERVED
0
VAS_SPI<5:0>
MODE
SEL
10011
10100
0
SYN_CONFIG_F<9:0>
Read
Main20
0
SYN_CONFIG_F<19:10>
W/R
Default
0
PA_DET_SEL<1:0>
SYN_CONFIG_N<6:0>
W/R
Default
E_TX_AMD<1:0>
RESERVED
RESERVED
TRIG_EN
1
RESERVED RESERVED
VAS_
Main19
TX_GAIN_PROG_SEL<4:1>
Reserved
Default
Main16
TX_GAIN<5:0>
VCO_BAND<5:0>
1
0
1
1
DIE_ID<2:0>
1
1
1
0
1
0
RESERVED
RESERVED
RESERVED
RESERVED RESERVED
Main21
0
10101
Default
0
0
1
0
1
1
1
1
1
1
Main22
0
10110
Reserved
0
1
1
0
1
1
1
0
0
0
Main23
0
10111
Reserved
0
0
0
1
1
0
0
1
0
1
Main24
0
11000
Reserved
1
0
0
1
0
0
1
1
1
1
Main25
0
11001
Reserved
1
1
1
0
1
0
1
0
0
0
Main26
0
11010
Reserved
0
0
0
0
0
1
0
1
0
1
Main27
0
11011
RESERVED
RESERVED
RESERVED
0
Main28
0
11100
W/R
DIE_ID_
READ
RESERVED
Default
0
1
W/R
RESERVED
RESERVED
Default
0
0
RESERVED RESERVED
1
0
RESERVED RESERVED
0
1
VAS_VCO_
READ
0
0
RESERVED
RESERVED
1
0
0
RESERVED RESERVED
0
0
PA_BIAS_DLY<3:0>
0
0
1
1
______________________________________________________________________________________ 23
MAX2850
Table 2. MAX2850 Register Summary (continued)
MAX2850
5GHz, 4-Channel MIMO Transmitter
Table 2. MAX2850 Register Summary (continued)
READ/WRITE AND ADDRESS
REGISTER
Main0_
D0
A4:A0
WRITE (W)/
READ (R)
DATA
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
Main29
0
11101
Reserved
0
0
0
0
0
0
0
0
0
0
Main30
0
11110
Reserved
0
0
0
0
0
0
0
0
0
0
Main31
0
11111
Reserved
0
0
0
0
0
0
0
0
0
0
Local1
1
00001
Reserved
0
0
0
0
0
0
0
0
0
0
Local2
1
00010
Reserved
0
0
0
0
0
0
0
0
0
0
Local3
1
00011
Reserved
0
0
0
0
0
0
0
0
0
0
Local4
1
00100
Reserved
1
1
1
0
0
0
0
0
0
0
Local5
1
00101
Reserved
0
0
0
0
0
0
0
0
0
0
Local6
1
00110
Reserved
0
0
0
0
0
0
0
0
0
0
Local7
1
00111
Reserved
0
0
0
0
0
0
0
0
0
0
Local8
1
01000
Reserved
0
1
1
0
1
0
1
0
1
0
Local9
1
01001
Reserved
0
1
0
0
0
1
0
1
0
0
Local10
1
01010
Reserved
1
1
0
1
0
1
0
1
0
0
Local11
1
01011
Reserved
0
0
0
1
1
1
0
0
1
1
Local12
1
01100
Reserved
0
0
0
0
0
0
0
0
0
0
Local13
1
01101
Reserved
0
0
0
0
0
0
0
0
0
0
Local14
1
01110
Reserved
0
0
0
0
0
0
0
0
0
0
Local15
1
01111
Reserved
0
0
0
0
0
0
0
0
0
0
Local16
1
10000
Reserved
0
0
0
0
0
0
0
0
0
0
Local17
1
10001
Reserved
0
0
0
0
0
0
0
0
0
0
0
Local18
1
10010
Reserved
0
0
0
0
0
0
0
0
0
Local19
1
10011
Reserved
0
0
0
0
0
0
0
0
0
0
Local20
1
10100
Reserved
0
0
0
0
0
0
0
0
0
0
Local21
1
10101
Reserved
0
0
0
0
0
0
0
0
0
0
0
Local22
1
10110
Reserved
0
0
0
0
0
0
0
0
0
Local23
1
10111
Reserved
0
0
0
0
0
0
0
0
0
0
Local24
1
11000
Reserved
0
0
1
1
0
0
0
1
0
0
Local25
1
11001
Reserved
0
1
0
0
1
0
1
0
1
1
Local26
1
11010
Reserved
0
1
0
1
1
0
0
0
1
Local27
1
11011
W/R
RESERVED
RESERVED
RESERVED RESERVED
Default
0
0
0
1
TX_AMD_
TX_AMD_RF_GAIN
RESERVED
RESERVED
RESERVED
0
0
0
0
0
0
0
BB_GAIN
<1:0>
Local28
1
11100
Reserved
0
0
0
0
0
0
0
1
0
0
Local31
1
11111
Reserved
0
0
0
0
0
0
0
0
0
0
24 �������������������������������������������������������������������������������������
5GHz, 4-Channel MIMO Transmitter
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9
DESCRIPTION
Reserved bits; set to default
D8:D5
Tx MIMO Channel Select
Select Tx channels independently.
0 = Not select
1 = Select in Tx, Tx calibration, or RF loopback modes
1111 = Default
MODE<2:0>
D4:D2
IC Operating Mode Select
000 = Clockout (default)
001 = Standby
010 = Rx
011 = Tx
100 = Tx calibration
101 = RF loopback
11x = Baseband loopback
RFBW
D1
RF Bandwidth
0 = 20MHz
1 = 40MHz (default)
M/L_SEL
D0
Main or Local Address Select
0 = Main registers (default)
1 = Local registers
E_TX<4:1>
Table 4. Main Address 1: (A4:A0 = 00001, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D8
Reserved bits; set to default
D7:D5
LNA Gain Control
Active when Rx channel is selected by corresponding
RX_PATH_UNMASK<5:1> bits in Main address 6 D9:D5.
000 = Maximum - 40dB
001 = Maximum - 32dB
100 = Maximum - 24dB
101 = Maximum - 16dB
110 = Maximum - 8dB
111 = Maximum gain (default)
LNA_GAIN<2:0>
VGA_GAIN<4:0>
D4:D0
DESCRIPTION
Rx VGA Gain Control
Active when Rx channel is selected by corresponding
RX_PATH_UNMASK<5:1> bits in Main address 6 D9:D5.
00000 = Minimum gain
00001 = Minimum + 2dB
…
01110 = Minimum + 28dB
01111 = Minimum + 30dB
…
1xxxx = Minimum + 30dB (default)
______________________________________________________________________________________ 25
MAX2850
Table 3. Main Address 0: (A4:A0 = 00000)
MAX2850
5GHz, 4-Channel MIMO Transmitter
Table 5. Main Address 2: (A4:A0 = 00010, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D7
Reserved bits; set to default
LNA_BAND<1:0>
D6:D5
LNA Frequency Band Switch
00 = 4.9GHz~5.2GHz
01 = 5.2GHz~5.5GHz (default)
10 = 5.5GHz~5.8GHz
11 = 5.8GHz~5.9GHz
RESERVED
D4:D0
Reserved bits; set to default
DESCRIPTION
Table 6. Main Address 3: (A4:A0 = 00011, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D8
TS_EN
D7
Temperature Sensor Enable
0 = Disable (default)
1 = Enable except shutdown or clockout mode
TS_TRIG
D6
Temperature Sensor Reading Trigger
0 = Not trigger (default)
1 = Trigger temperature reading
RESERVED
D5
Reserved bits; set to default
TS_READ<4:0>
D4:D0
SPI readback only.
Temperature sensor reading.
DESCRIPTION
Reserved bits; set to default
Table 7. Main Address 5: (A4:A0 = 00101, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9
DESCRIPTION
Reserved bits; set to default
RSSI_MUX_SEL<2:0>
D8:D6
RSSI Output Select
000 = Baseband RSSI (default)
001 = Do not use
010 = Do not use
011 = Do not use
100 = Rx RF detector
101 = Do not use
110 = PA power-detector mux output
111 = Do not use
RESERVED
D5:D2
Reserved bits, set to default
RXHP
D1
Rx VGA Highpass Corner Select after Rx Turn-On
RXHP starts at 1 during Rx gain adjustment, and set to 0 after gain is
adjusted.
0 = 10kHz highpass corner after Rx gain is adjusted (default)
1 = 600kHz highpass corner during Rx gain adjustment
RESERVED
D0
Reserved bits; set to default
26 �������������������������������������������������������������������������������������
5GHz, 4-Channel MIMO Transmitter
BIT NAME
TX_GAIN<5:0>
BIT LOCATION
(D0 = LSB)
D9:D4
DESCRIPTION
Tx VGA Gain Control
Tx channel is selected by Main address 9 D3:D0.
000000 = Minimum gain (default)
…
111111 = Minimum gain + 31.5dB
TX_GAIN_PROG_SEL<4:1>
D3:D0
Tx Channel Gain Programming Select
Gain is determined by Main address 9 D9:D4.
0 = Not selected
1 = Selected
1111 = Default
Table 9. Main Address 11: (A4:A0 = 01011, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D4
Reserved bits; set to default
D3:D2
Tx Calibration AM Detector Channel Select
Only active in Tx calibration mode.
00 = Select TX1 (default)
01 = Select TX2
10 = Select TX3
11 = Select TX4
D1:D0
PA Power-Detector Mux Output Select
00 = Select PA_DET1 (default)
01 = Select PA_DET2
10 = Select PA_DET3
11 = Select PA_DET4
E_TX_AMD<1:0>
PA_DET_SEL<1:0>
DESCRIPTION
Table 10. Main Address 14: (A4:A0 = 01110, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D2
Reserved bits; set to default
DOUT_SEL
D1
DOUT Pin Output Select
0 = PLL lock detect (default)
1 = SPI readback
RESERVED
D0
Reserved bits; set to default
DESCRIPTION
______________________________________________________________________________________ 27
MAX2850
Table 8. Main Address 9: (A4:A0 = 01001, Main Address 0 D0 = 0)
MAX2850
5GHz, 4-Channel MIMO Transmitter
Table 11. Main Address 15: (A4:A0 = 01111, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
DESCRIPTION
Enable VCO Sub-Band Acquisition Triggered by SYN_CONFIG_F<9:0>
(Main Address 17) Programming
0 = Disable for small frequency adjustment (i.e., ~100kHz)
1 = Enable for channel switching (default)
VAS_TRIG_EN
D9
RESERVED
D8:D7
Reserved bits; set to default
SYN_CONFIG_N<6:0>
D6:D0
Integer Divide Ratio
1000010 = Default
Table 12. Main Address 16: (A4:A0 = 10000, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
SYN_CONFIG_F<19:10>
D9:D0
DESCRIPTION
Fractional Divide Ratio MSBs
1110000000 = Default
Table 13. Main Address 17: (A4:A0 = 10001, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
SYN_CONFIG_F<9:0>
D9:D0
DESCRIPTION
Fractional Divide Ratio LSBs
0000000000 = Default
Table 14. Main Address 18: (A4:A0 = 10010, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D8
Reserved bits; set to default
D7:D0
Crystal Oscillator Frequency Tuning
00000000 = Minimum frequency
10000000 = Default
11111111 = Maximum frequency
XTAL_TUNE<7:0>
DESCRIPTION
Table 15. Main Address 19: (A4:A0 = 10011, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D8
DESCRIPTION
Reserved bits; set to default
VAS_RELOCK_SEL
D7
VAS Relock Select
0 = Start at sub-band selected by VAS_SPI<5:0> (Main address 19 D5:D0)
(default)
1 = Start at current sub-band
VAS_MODE
D6
VCO Subband Select
0 = By VAS_SPI<5:0> (Main address 19 D5:D0)
1 = By on-chip VCO autoselect (VAS) (default)
28 �������������������������������������������������������������������������������������
5GHz, 4-Channel MIMO Transmitter
BIT NAME
VAS_SPI<5:0>
BIT LOCATION
(D0 = LSB)
D5:D0
DESCRIPTION
VCO Autoselect Sub-Band Input
Select VCO sub-band when VAS_MODE (Main address 19 D6) = 0.
Select initial VCO sub-band for autoacquisition when VAS_MODE = 1.
000000 = Minimum frequency sub-band
…
011111 = Default
…
111111 = Maximum frequency sub-band
VAS_ADC<2:0>
(Readback Only)
D8:D6
Read VCO Autoselect Tune Voltage ADC Output
Active when VCO_VAS_RB (Main address 27 D5) = 1.
000 = Lower than lock range and at risk of unlock
001 = Lower than acquisition range and maintain lock
010 or 101 = Within acquisition range and maintain lock
110 = Higher than acquisition range and maintain lock
111 = Higher than lock range and at risk of unlock
VCO_BAND<5:0>
(Readback Only)
D5:D0
Read the Current Acquired VCO Sub-Band by VCO Autoselect
Active when VCO_VAS_RB (Main address 27 D5) = 1.
Table 16. Main Address 21: (A4:A0 = 10101, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D0
DIE_ID<2:0>
(Readback Only)
D7:D5
DESCRIPTION
Reserved bits; set to default
Read Revision ID at Main Address 21 D7:D5
Active when DIE_ID_READ (Main address 27 D9) = 1.
000 = Pass1
001 = Pass2
…
Table 17. Main Address 27: (A4:A0 = 11011, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
DIE_ID_READ
D9
RESERVED
D8:D6
VAS_VCO_READ
D5
RESERVED
D4:D0
DESCRIPTION
Die ID Readback Select
0 = Main address 21 D9:D0 reads its own values (default)
1 = Main address 21 D7:D5 reads revision ID
Reserved bits, set to default
VAS ADC and VCO Sub-Band Readback Select
0 = Main address 19 D9:D0 reads its own values (default).
1 = Main address 19 D8:D6 reads VAS_ADC<2:0>; Main address 19 D5:D0
reads VCO_BAND<5:0>.
Reserved bits; set to default
______________________________________________________________________________________ 29
MAX2850
Table 15. Main Address 19: (A4:A0 = 10011, Main Address 0 D0 = 0) (continued)
MAX2850
5GHz, 4-Channel MIMO Transmitter
Table 18. Main Address 28: (A4:A0 = 11100, Main Address 0 D0 = 0)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D4
PA_BIAS_DLY<3:0>
D3:D0
DESCRIPTION
Reserved bits; set to default
PA_BIAS Turn-On Delay
0000 = 0Fs
0001 = 0Fs
0010 = 0.5Fs
0011 = 1.0Fs (default)
…
1111 = 7.0Fs
Table 19. Local Address 27: (A4:A0 = 11011, Main Address 0 D0 = 1)
BIT NAME
BIT LOCATION
(D0 = LSB)
RESERVED
D9:D3
TX_AMD_BB_GAIN
D2
TX_AMD_RF_GAIN
D1:D0
DESCRIPTION
Reserved bits, set to default
Tx Calibration AM Detector Baseband Gain
0 = Minimum gain (default)
1 = Minimum gain + 5dB
Tx Calibration AM Detector RF Gain
00 = Minimum gain (default)
01 = Minimum gain + 14dB rise at output
1x = Minimum gain + 28dB rise at output
30 �������������������������������������������������������������������������������������
5GHz, 4-Channel MIMO Transmitter
TXRF1
OUTPUT
2.0nH
VCC_UCX1
1.0pF
1.0nF
40MHz
XTAL
3.6nH
1nF
5.6pF
39pF
68
VCC_UCX1
67
66
65
64
63
62
61
60
59
58
57
56
55
1
54
53
VCC_XTAL
1µF
XTAL
XTAL_CAP
ENABLE
TXBBI2+
TXBBI2-
TXBBQ2+
TXBBQ2-
VCC_BB1
TXBBI1+
TXBBI1-
TXBBQ1+
TXBBQ1-
PA_DET1
TXRF1+
TXRF1-
PA_BIAS1
10nF
52
CRYSTAL OSCILLATOR/BUFFER
51
CLKOUT
1nF
VCC_UCX2
2
50
DOUT
1nF
PA_DET2
VCC_UCX2
GND
1.2pF
PHASE-LOCKED LOOP
3
49
4
48
VCC_DIG
33pF
TXRF2
OUTPUT
TXRF2+
5
47
6
46
CPOUT+
10nF
30I
CPOUT-
PLL LOOP FILTER
2.2nF
30I
3.9nH
TXRF2-
2.4nH
1.0nF
GND
PA_BIAS2
VCC_PA_BIAS
7
8
9
0.1µF
VCC_LO
PA_DET1
PA_DET2
PA_DET3
PA_DET4
TXRF1+/TXRF2+/TXRF3+/TXRF4+/-
PA_BIAS3
1.2pF
TXRF3+
VCC_VCO
10nF
RF
RSSI
MAX2850
90˚
BB
RSSI
90˚
43
RSSI
MUX
0˚
10
42
AMD+/-
VCC_UCX3
BYP_VCO
1µF
44
0˚
AM
DETECTOR
1nF
TXRF3
OUTPUT
45
PA
DETECT
MUX
GND_VCO
TXRF4+/-
11
41
AMD+/-
12
40
RSSI
RXBBQ-
RXBBQ+
RXBBI-
3.9nH
2.4nH
TXRF3+
1.0nF
PA_DET3
GND
VCC_UCX3
13
39
14
38
15
37
16
36
DOUT
RXBBI+
TXBBQ3-
TXBBQ3+
TXBBI3-
1nF
17
35
SERIAL
INTERFACE
31
32
33
TXBBI3+
34
DIN
30
TXBBQ4-
29
TXBBQ4+
28
TXBBI4-
27
TXBBI4+
26
VCC_BB2
RXRF-
25
RXRF+
24
VCC_MXR
23
VCC_LNA
22
PA_DET4
21
TXRF4-
20
TXRF4+
19
PA_BIAS4
GND
18
SCLK
1nF
CS
VCC_UCX4
1nF
4.3nH
10nF
1.0pF
VCC_UCX4
1.0pF
1.0nF
100nF
20pF
1.3nH
2.4nH
TXRF4
OUTPUT
RXRF4
OUTPUT
TQFN
______________________________________________________________________________________ 31
MAX2850
Typical Operating Circuit
MAX2850
5GHz, 4-Channel MIMO Transmitter
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that
a “+”, “#”, or “-” in the package code indicates RoHS
status only. Package drawings may show a different suffix character, but the drawing pertains to the package
regardless of RoHS status.
PACKAGE TYPE
PACKAGE CODE
DOCUMENT NO.
68 TQFN-EP
T6800+2
21-0142
32 �������������������������������������������������������������������������������������
5GHz, 4-Channel MIMO Transmitter
REVISION
NUMBER
REVISION
DATE
0
10/09
Initial release
1
3/10
Modified EC table to support single-pass room test flow
DESCRIPTION
PAGES
CHANGED
—
2, 3, 5, 6, 8
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.
Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2010
Maxim Integrated Products 33
Maxim is a registered trademark of Maxim Integrated Products, Inc.
MAX2850
Revision History