LMX248x Evaluation Board
User's Guide
Revised – March 2014
SNAU137
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LMX248x
Evaluation Board Operating Instructions
2
SNAU137
LMX248x Evaluation Board User’s Guide
Copyright © 2014, Texas Instruments Incorporated
Revised - March 2014
www.ti.com
Table of Contents
EQUIPMENT .....................................................................................................................................................................................4
BASIC OPERATION ...........................................................................................................................................................................5
LMX2485 BOARD INFORMATION....................................................................................................................................................7
RF PLL PHASE NOISE .....................................................................................................................................................................9
RF PLL FRACTIONAL SPURS ......................................................................................................................................................... 11
RF PLL LOCK TIME ...................................................................................................................................................................... 12
IF PLL LOCK TIME ........................................................................................................................................................................ 14
IF PLL PHASE NOISE ..................................................................................................................................................................... 15
IF PLL SPURS ................................................................................................................................................................................ 16
LMX2486 BOARD INFORMATION.................................................................................................................................................. 17
RF PLL PHASE NOISE ................................................................................................................................................................... 18
RF PLL FRACTIONAL SPURS ......................................................................................................................................................... 20
RF PLL LOCK TIME (WITH A SPECTURM ANALYZER) .................................................................................................................. 21
IF PLL PHASE NOISE ..................................................................................................................................................................... 22
IF PLL SPURS ................................................................................................................................................................................ 23
IF PLL LOCK TIME ........................................................................................................................................................................ 24
LMX2487 BOARD INFORMATION.................................................................................................................................................. 25
FINDING A VCO ............................................................................................................................................................................ 25
REPLACING THE VCO WITH A FOOTPRINT COMPATIBLE VCO ...................................................................................................... 26
APPENDIX A: SCHEMATICS ............................................................................................................................................................ 27
APPENDIX B: BUILD DIAGRAMS .................................................................................................................................................... 28
APPENDIX C: BILL OF MATERIALS ................................................................................................................................................ 31
APPENDIX D: QUICK START FOR EVM COMMUNICATIONS ........................................................................................................... 34
Revised - March 2014
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Equipment
Power Supply
The Power Supply should be a low noise power supply. An Agilent 6623A Triple power supply with LC filters on the
output to reduce noise was used in creating these evaluation board instructions.
Signal Generator
The Signal Generator should be capable of frequencies and power level required for the part. A Rohde & Schwarz SML03
was used in creating these evaluation board instructions.
Phase Noise / Spectrum Analyzer
For measuring phase noise an Agilent E5052A is recommended. An Agilent E4445A PSA Spectrum Analyzer with the
Phase Noise option is also usable although the architecture of the E5052A is superior for phase noise measurements. At
frequencies less than 100 MHz the local oscillator noise of the PSA is too high and measurements will be of the local
oscillator, not the device under test.
Oscilloscope
The oscilloscope and probes should be capable of measuring the output frequencies of interest when evaluating this
board. The Agilent Infiniium DSO81204A was used in creating these evaluation board instructions.
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Copyright © 2014, Texas Instruments Incorporated
Revised - March 2014
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Basic Operation
1. Connect the signal generator output to the OSCin input of the board. For this example we use a 10 MHz sin
signal at +5dBm power level.
2. Connect a low noise 3.3 V power supply to the Vcc connector located at the top left of the board.
3. Please see Appendix D for quick start on interfacing the board. Connect PC to the uWire header.
4. Start CodeLoader4.exe.
5. Click “Select Device”  “PLL-Fractional”  LMX248x depending on which chip is on your board.
Revised - March 2014
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6. Select USB or LPT Communication Mode on the Port Setup tab as appropriate.
7. Click “CTRL + L” to load settings into device
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Revised - March 2014
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LMX2485 Board Information
TM
The LMX2485 Evaluation Board simplifies evaluation of the LMX2485 2.6 GHz/0.8 GHz PLLatinum dual frequency
synthesizer. The board enables all performance measurements with no additional support circuitry. The evaluation
board consists of a LMX2485 device, a RF VCO module and IF VCO & RF/IF loop filters built by discrete components.
The SMA flange mount connectors are provided for external reference input, RF and IF VCO outputs, and the power and
grounding connection. A cable assembly is bundled with the evaluation board for connecting to a PC through the parallel
printer port. By means of USB2ANY-uWire serial port emulation, the CodeLoader software included can be run on a PC
to facilitate the LMX2485 internal register programming for the evaluation and measurement.
RF LOOP FILTER
Theoretical ( NOT Measured ) Simulation
(Done with EasyPLL at http://www.ti.com/lsds/ti/wireless)
Phase Margin
48.3 deg
Pole Ratio
T3 /T1
40.2 %
Loop Bandwidth
11.3 KHz
Pole Ratio
T4/T3
36.3 %
Lock Time
2400 – 2480 MHz to 1
KHz tolerance in
247 uS w/o Fastlock
Spur Gain
@ 200 KHz
-45.8 dB
3.9 KΩ
5.6 KΩ
VCO
CPoRF
47 nF
2.7 nF
Revised - March 2014
820 Ω
270 pF
180 pF
Settings for Operation
400 uA
Kφ
Comparison
10 MHz
Frequency
Output
2400 – 2480
Frequency
MHz
PLL Supply
2.5 Volts
VCO Supply
3 Volts
Other Information
VCO Used
VARIL2450U
VCO Gain
55 MHz/Volt
VCO Input
22 pF
Capacitance
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IF LOOP FILTER
Theoretical ( NOT Measured ) Simulation ( Done with EasyPLL at www.ti.com )
Phase Margin
47.1 deg
Lock Time
760 - 780 MHz
MHz to 1 KHz
tolerance in 453
uS
Loop Bandwidth
5.1 KHz
Spur Gain
@ 200 KHz
22.1 dB
0 Ω
0 Ω
VCO
CPoRF
10 nF
1.8 nF
8
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8.2 KΩ
Open
Open
Settings for Operation
4 mA
Kφ
Comparison
50 kHz
Frequency
Output
760 - 780 MHz
Frequency
PLL Supply
2.5 Volts
VCO Supply
3 Volts
Other Information
VCO Used VARIL191-773U
VCO Gain
18 MHz/Volt
VCO Input
100 pF
Capacitance
LMX248x Evaluation Board User’s Guide
Copyright © 2014, Texas Instruments Incorporated
Revised - March 2014
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RF PLL Phase Noise
Loop Bandwidth is about 10 kHz. Note that the phase noise gradually improves as one goes farther
from the carrier. Also note that this is done with 200 uA of current, and the true phase noise
capability of the part is not shown here because the phase noise is worse, and the VCO phase
noise could still be degrading the in-band phase noise.
Revised - March 2014
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For this plot, the charge pump was increased to 1600 uA. This improves the PLL phase noise performance and
also increases the loop bandwidth so the true PLL performance can be seen. The reason that the original loop
filter was not designed for 1600 uA current was that it makes the loop filter capacitors 8X larger and also, the
lower current allows one to experiment with lower comparison frequencies like 2.5 MHz, 5 MHz, and 10 MHz.
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Copyright © 2014, Texas Instruments Incorporated
Revised - March 2014
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RF PLL Fractional Spurs
At 2400.2 MHz output frequency, the
primary fractional spur at 200 kHz is
-70.7 dBc, and the sub-fractional spur at
100 kHz is -69.5 dBc.
At 2440.2 MHz output frequency, the
primary fractional spur at 200 kHz is
-78.9 dBc, and the sub-fractional spur at
100 kHz is -72.9 dBc.
At 2480.2 MHz output frequency, the
primary fractional spur at 200 kHz is
-80.8 dBc, and the sub-fractional spur at
100 kHz is -73.4 dBc.
Revised - March 2014
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RF PLL Lock Time
Peak time without cycle slip
reduction is 1110 uS.
No CSRC. RF_TOC=0
Peak time without cycle slip
reduction is 1622 uS.
Positive lock time is 1220 uS
Negative Lock time is 1711 uS
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Copyright © 2014, Texas Instruments Incorporated
Revised - March 2014
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RF PLL Lock Time
Cycle Slip Reduction Enabled. RF_TOC=500
Peak time with cycle slip reduction
is 222 uS.
Peak time with cycle slip reduction
is 222 uS.
Positive lock time is 345 uS
Negative Lock time is 378 uS
Revised - March 2014
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Copyright © 2014, Texas Instruments Incorporated
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IF PLL Lock Time
Peak time is 97.8 uS
Peak Time is 133.3 uS
Positive Lock time is 510 uS
Negative Lock Time is 474 uS
14
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Copyright © 2014, Texas Instruments Incorporated
Revised - March 2014
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IF PLL Phase Noise
Revised - March 2014
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IF PLL Spurs
Spurs at 50 kHz offset for an output frequency of
760 MHz are -97.5 dBc.
Note the cusping effect at 50 kHz. This is because
the loop bandwidth is wide relative to the
comparison frequency. This is due to the discrete
sampling action of the phase detector.
Spurs at 50 kHz offset for an output frequency of
770 MHz are -81.7 dBc.
Spurs at 50 kHz offset for an output frequency of
780 MHz are -71.7 dBc.
16
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LMX248x Evaluation Board User’s Guide
Copyright © 2014, Texas Instruments Incorporated
Revised - March 2014
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LMX2486 Board Information
TM
The LMX2486 Evaluation Board simplifies evaluation of the LMX2486 4.5 GHz/3.0 GHz PLLatinum dual frequency
synthesizer. The board enables all performance measurements with no additional support circuitry. The evaluation
board consists of a LMX2486 device, a RF VCO module and IF VCO & RF/IF loop filters built by discrete components.
The SMA flange mount connectors are provided for external reference input, RF and IF VCO outputs, and the power and
grounding connection. A cable assembly is bundled with the evaluation board for connecting to a PC through the parallel
printer port. By means of USB2ANY-uWire serial port emulation, the CodeLoader software included can be run on a PC
to facilitate the LMX2486 internal register programming for the evaluation and measurement.
RF Loop Filter
Phase Margin
46.5 deg
Pole Ratio T3
4.5 %
Pole Ratio
Loop Bandwidth
9.8 KHz
57.7 %
T4/T3
Theoretical Discrete
915 uS w/o CSR to 1
Roll-Off
-42.7 dB
Lock Time
kHz
@ 200 KHz
Settings for Operation
8X (760 uA)
Kφ
VCO
56 Ω
33 Ω
Comparison
20 MHz
CPoRF
Frequency
220 nF
Output
3200 – 3300
15 nF
4.7 nF
6.8 nF
Frequency
MHz
150 Ω
3.3 Volts from
PLL Supply
regulator
VCO Supply
5.5 Volts
VCO Information
VCO Used
VARIL690KVCO
90 MHz/Volt
Input
22 pF
Capacitance
IF Loop Filter
Theoretical
Phase Margin
48.1 deg
Discrete Lock
160 uS to 1 kHz
Time
Spur Gain
Loop Bandwidth
16.8 KHz
50.5 dB
@ 50 KHz
Settings for Operation
3.5 mA
Kφ
Comparison
VCO
200 kHz
0 Ω
Frequency
CPoRF
Output
2100 - 2200
4.7 nF
Frequency
MHz
Open
680 pF
3.3 Volts from
4.7 KΩ
PLL Supply
regulator
VCO Supply
5.5 volts
VCO Information
Revised – March 2014
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VCO Used
KVCO
Input
Capacitance
VARIL19080 MHz/Volt
120 pF
RF PLL Phase Noise
Loop Bandwidth is about 10 kHz. Note that the phase noise gradually improves as one goes farther from the
carrier. This was taken with the IF PLL powered up and IF VCO connected.
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Copyright © 2014, Texas Instruments Incorporated
Revised – March 2014
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For this plot, the charge pump was increased to 16X and the other conditions were the same.
Revised – March 2014
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RF PLL Fractional Spurs
At 3200.2 MHz output frequency, the primary
fractional spur at 200 kHz is
-80 dBc, and the sub-fractional spur at 100 kHz
is below the noise floor.
At 3240.2 MHz output frequency, the primary
fractional spur at 200 kHz is
– 88 dBc and the sub-fractional spur at 100
kHz is below the noise floor.
At 3200.2 MHz output frequency, the primary
fractional spur at 200 kHz is –82 dBc and the
sub-fractional spur is below the noise.
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Revised – March 2014
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RF PLL Lock Time (With a Specturm Analyzer)
Cycle Slip Reduction Enabled. RF_TOC=2500
The first step is to tune the PLL to the
final frequency.
On the spectrum
analyzer, set span to 0 Hz and the
frequency to the final frequency. Then
set the resolution bandwidth. If it is too
small, then it will make your lock time
look longer. If it is too large, frequency
resolution is lost. For this measurement,
30 kHz seems just about right. Now
adjust the sweep time to match the time
interval for the lock time measurement,
3 mS in this case. The power is –9.6
dBm
Now tune the PLL slightly off frequency.
If the PLL is tuned 10 kHz off frequency,
the output power drops to –11.1 dBm.
So when the output power is –11.1 dBm
or higher, we are theoretically within 10
kHz. If the PLL can not be tuned to fine
enough resolution, the center frequency
of the spectrum analyzer can also be
offset.
Using the external trigger to trigger off
the LE pulse, we measure the time it
takes to get and stay high enough in
power to be about 720 uS to a 10 kHz
tolerance.
If the timeout counter is set to zero to
disable cycle slip reduction, the lock time
increases to 2145 us. So cycle slip
reduction is very worthwhile, considering
it uses no external components and
requires
no
additional
software
overhead, once the part is set up.
Revised – March 2014
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IF PLL Phase Noise
Above is the IF PLL phase noise with the RF PLL powered up.
The above plot was taken with the RF PLL powered down and IF VCO disconnected.
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IF PLL Spurs
Fout = 2100 MHz
Not only are the spurs below the noise, but
they are actually improving the phase noise
near the offset of the spur!
This cusping effect is due to discrete sampling
effects of the phase detector/charge pump that
occur if the loop bandwidth is wide relative to
the comparison frequency.
Fout = 2150 MHz
Spurs at 200 kHz output frequency are
–82 dBc, although the noise is still being pulled
down due to this cusping effect.
Fout = 2200 MHz
Spurs at 200 kHz are not there and actually
reducing the noise due to discrete sampling
effects.
Revised – March 2014
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IF PLL Lock Time
Peak time is 73.3 uS.
This peak time is
increased because the VCO tuning voltage is
approaching the rail of the charge pump when
the PLL overshoots.
Peak Time is 37.8 uS
Positive Lock time is 253 uS
Negative Lock Time is 249 uS
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Revised – March 2014
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LMX2487 Board Information
Due to lack of availability for a VCO, there is no evaluation board available to evaluate the performance of the
LMX2487E.
However, there are VCOs at higher frequency that are available in footprints that are not
compatible to this board that can be attached to it.
In order to demonstrate the performance of the LMX2487E, one can take the LMX2487 evaluation board and
modify it for use with an external VCO. If the VCO is one that has a footprint that is the same or pinout
compatible, the best approach would be to remove the VCO from the existing LMX2487 evaluation board and
replace the VCO. If the VCO is very different, it can be configured externally. Even though the LMX2487 is not
guaranteed to the same high frequency operation as the LMX2487E, it is the same part, just tested to different
specifications. The reason that the LMX2487E sells at a premium is that it requires a special test setup for high
frequency and the yields are a little lower. Therefore, even though the LMX2487 is being run above it’s
specified limits, it has a high probability of working at these higher frequencies, the performance is just not
guaranteed.
Finding a VCO
Now this is the main problem. Many of the VCOs require higher tuning voltage or may have long lead times.
For VCOs that specify a higher tuning voltage than the LMX2487E can supply, there are two options. One is to
use an active filter and give the specified tuning voltage. Another solution is to use a passive traditional filter
with the understanding that the upper frequency range of the VCO will be less, since the highest tuning voltage
can not be achieved.
Manufacturer
Part No.
Freq. Range (MHz) Tuning Voltage
0.5 – 6.0
Universal Microwave UMT-1051-I12
7150 - 7550
0.5 – 4.5
Universal Microwave UMT-1050-I12
6800 - 6800
0 - 20
Spectrum Microwave HVA103SM-22
6800 - 8000
1 -13
Hittite
HMC532LP4
7100 - 7900
Revised – March 2014
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Replacing the VCO with a Footprint Compatible VCO
In order to replace the VCO, take component U2 and replace with the desired VCO. The VCO must be of the
VARIL-T style footprint, which is used by manufactures like Sirenza, Minicurcuits, Universal Microwave, and
Zcomm. However, it is suggested that if an LMX2487 board is being modified, the setup for that should be
verified. The dot signifies the tuning voltage.
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Revised – March 2014
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Appendix A: Schematics
LMX2487
Revised – March 2014
LMX248x Evaluation Board User’s Guide
Copyright © 2014, Texas Instruments Incorporated
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Appendix B: Build Diagrams
LMX2485
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Revised – March 2014
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LMX2486
Revised – March 2014
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Copyright © 2014, Texas Instruments Incorporated
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LMX2487
30
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Revised – March 2014
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Appendix C: Bill of Materials
LMX2485
Manufacturer
Part #
Value
Item
Qty
Unit
Size
Voltage
Tolerance
Material
Designator
0
25
1
1
Texas Instruments
LMX2485SQACBPCB
2
4
SPC Technology
SPCS-6
Stand-Offs
3
8
Com Con Connectors
CCIJ255G
2-Pin
Shunt
Plastic
4
5
6
1
1
1
Com Con Connectors
Com Con Connectors
FCI Electronics
HTSM3203-4G2
HTSM3203-12G2
52601-S10-8
4-Pin
12-Pin
10-Pin
Header
Header
Header
Plastic
Plastic
Plastic
7
6
Johnson Components
142-0701-851
Edge SMA
8
13
Kemet
C0603C470J5GAC
47
pF
603
50 V
5%
C0G
9
1
Kemet
C0603C180J5GAC
180
pF
604
50 V
5%
C0G
C4_RF
10
11
12
13
1
1
1
1
Kemet
Kemet
Panasonic
Kemet
C0603C270J5GAC
C0805C182J3GAC
ECHU1C103JX5
C0805C272J3GACTU
270
1.8
10
2.7
pF
nF
nF
nF
605
805
805
603
50 V
25 V
16 V
5%
5%
5%
C0G
C0G
Film
C3_RF
C1_IF
C2_IF
C1_RF
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
2
1
11
3
3
8
6
1
1
1
1
1
6
6
2
1
Kemet
Panasonic
Kemet
Kemet
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Steward
Texas Instruments
C0603C104K3RAC
ECHU1C473JB5
C0603C105K3PAC
T494A106K010AS
CRCW0603000ZRT1
CRCW0603100JRT1
CRCW0603180JRT1
CRCW0603510FRT1
CRCW0603821JRT1
CRCW0603392JRT1
CRCW0603562JRT1
CRCW0603822JRT1
CRCW0603103JRT1
CRCW0603123JRT1
LI0603D301R-00
LMX2485
nF
nF
uF
uF
ohm
ohm
ohm
ohm
ohm
Kohm
Kohm
Kohm
Kohm
Kohm
nH
n/a
603
1206
603
1206
0603
0603
0603
0603
0603
0603
0603
0603
0603
0603
603
24P
25 V
50
25 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10%
5
10%
10%
5%
5%
5%
1%
5%
5%
5%
5%
5%
5%
3.6
n/a
X7R
Film
X5R
Tantalum
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Ferrite
Silicon
C20, C21
C2pRF
C4, C5, C6, C7, C8, C9, C10, C11, C24, C25, C26
C1, C2
R3_IF, R31
R1, R4, R5, R6, R7, R8, R9, R10, R11
R3, R27, R28, R29, R33, R34
R32
R2_RF
R3_RF
R4_RF
R2_IF
R13, R15, R17, R19, R21, R23
R12, R14, R16, R18, R20, R22
L1, L2
U1
30
1
VARIL
VCO191-2450U
MHz
U
3V
Can
U2
31
1
VARIL
VCO191-773U
100
47
1
10
0
10
18
51
820
3.9
5.6
8.2
10
12
Inductor
PLL
2400 2480
760-780
MHz
U
3V
Can
U3
-- C2_RF, C2pIF, C3, C3_IF, C29, C30p
-- OSCin*, CPLR
-- R2, R2pRF, R3p, R24, R25, R26, R27p, R30, R33p
-- R100, R101, R102, R103, R104, R105, R106, C100, C101, C102
Revised – March 2014
er = 4.2
Top and Bottom Layers are 14 mil
Getek
n/a
Nylon
Place in 4 holds in edge of board
Place accross POWER_PLL (1-2, 3-4, 5-6, 7-8, 9-10,
11-12)
and POWER_VCO (1-2, 3-4)
POWER_VCO
POWER_PLL
uWire
Ftest/LD, IF_OUT, OSCin, RF_OUT, VccPLL,
VccVCO
C12, C13, C14, C15, C16, C17, C18, C19, C22, C23,
C27, C28, C30
Metal
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LMX2486
Revision
Item
Qty
6/24/2005
Manufacturer
Part Number
Value
0
21
Open
(No Component)
1
1
Texas Instruments
LMX2487SQAEBPCB
2
4
SPC Technology
SPCS-8
3
9
Com Con Connectors
CTIJ-255G
2-Pin
4
5
6
7
1
1
1
4
Com Con Connectors
Com Con Connectors
FCI Electronics
Johnson Components
HTSM3203-4G2
HTSM3203-14G2
52601-S10-8
142-0701-851
8
14
Kemet
9
10
11
12
13
14
15
16
1
1
1
1
1
1
2
1
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Unit
εr = 3.38
Stand-Offs
Size
Voltage
Tolerance
4 Layer board. Thickness is 62 mils.
Material
Rogers 4003
Designator
C2pRF, C2_IF, C3_IF, C29, C100, C101
R1, R2pRF, R3, R20, R21, R24, R25, R27p
R30p, R100, R101, R102, R103
Ftest/LD, VccPLL
n/a
Nylon
Place in 4 holds in edge of board
Shunt
Plastic
Place accross POWER_PLL
(1-2, 3-4, 5-6, 7-8, 9-10, 11-12, 13-14)
and POWER_VCO (1-2, 3-4)
4-Pin
14-Pin
10-Pin
Edge SMA
Header
Header
Header
Plastic
Plastic
Plastic
Metal
C0603C470J5GAC
47
pF
603
50 V
5%
C0G
Kemet
Kemet
Kemet
Kemet
Kemet
Kemet
Kemet
Kemet
C0603C681J3GAC
C0603C472J3RAC
C0603C682J3RAC
C1206C472J5GAC
C0603C153J3RAC
C1206C103J3GAC
C0603C104K3RAC
C0805C224J4RAC
680
4.7
6.8
4.7
15
10
100
220
pF
nF
nF
nF
nF
nF
nF
nF
603
603
603
1206
603
1206
603
805
25 V
25 V
25 V
50 V
25 V
25 V
25 V
16 V
5%
5%
5%
5%
5%
5%
10%
5%
C0G
X7R
X7R
C0G
X7R
C0G
X7R
X7R
13
Kemet
C0603C105K4PAC
1
uF
603
16 V
10%
X5R
2
1
9
8
1
1
1
1
1
5
5
1
1
1
1
Kemet
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Texas Instruments
VARIL
VARIL
Texas Instruments
C0805C106K8PAC
CRCW0603000ZRT1
CRCW0603100JRT1
CRCW0603180JRT1
CRCW0603510FRT1
CRCW0603330FRT1
CRCW0603560FRT1
CRCW0603151JRT1
CRCW0603472JRT1
CRCW0603103JRT1
CRCW0603123JRT1
LMX2486SQ
VCO690-3300T
VCO190-2200T
LP3985IM5X-3.3
10
0
10
18
51
33
56
150
4.7
10
12
PLL
3120-3300
2100-2200
3.3
uF
ohm
ohm
ohm
ohm
ohm
ohm
ohm
Kohm
Kohm
Kohm
n/a
MHz
MHz
V
805
0603
0603
0603
0603
603
603
603
0603
0603
0603
24P
T
T
SOT23
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
3.6 V
5V
5V
3.3V
10%
5%
5%
5%
1%
5%
5%
5%
5%
5%
5%
n/a
X5R
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Silicon
Can
Can
Silicon
32
SNAU137
LMX248x Evaluation Board User’s Guide
Copyright © 2014, Texas Instruments Incorporated
POWER_VCO
POWER_PLL
uWire
IF_OUT, OSCin, RF_OUT, VccVCO
C12, C13, C14, C15, C16, C17, C18,
C19, C22, C23, C27, C28, C30, C33
C1_IF
C3_RF
C1_RF
C2pIF
C4_RF
C32
C20, C21
C2_RF
C3, C4, C5, C6, C7, C8, C9,
C10, C11, C24, C25, C26, C31
C1, C2
R3_IF
R4, R5, R6, R7, R8, R9, R10, R11, R26
R27, R28, R29, R30, R31, R32, L1, L2
R2
R4_RF
R3_RF
R2_RF
R2_IF
R12, R14, R16, R18, R22
R13, R15, R17, R19, R23
U1
U2
U3
U4
Revised – March 2014
www.ti.com
LMX2487
#
Qty
Manufacturer
Part #
Value
0
27
1
1
Texas Instruments
LMX2487ESQACBPCB
2
4
SPC Technology
SPCS-6
Stand-Offs
3
8
Com Con Connectors
CCIJ255G
2-Pin
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
1
1
1
6
13
1
1
1
1
1
2
1
11
2
2
8
6
1
1
1
1
1
6
6
2
1
Com Con Connectors
Com Con Connectors
FCI Electronics
Johnson Components
Kemet
Kemet
Kemet
Kemet
Kemet
Kemet
Kemet
Kemet
Kemet
Kemet
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Vishay
Steward
VARIL
HTSM3203-4G2
HTSM3203-12G2
52601-S10-8
142-0701-851
C0603C470J5GAC
C0603C151J5GAC
C0603C181J5GAC
C0603C681J3GAC
C0805C472K3RAC
C0603C102J5GAC
C0603C104K3RAC
C0805C183K3RAC
C0603C105K3PAC
T494A106K010AS
CRCW0603000ZRT1
CRCW0603100JRT1
CRCW0603180JRT1
CRCW0603510FRT1
CRCW0603272JRT1
CRCW0603472JRT1
CRCW0603682JRT1
CRCW0603472JRT1
CRCW0603103JRT1
CRCW0603123JRT1
LI0603D301R-00
30
1
VARIL
VCO191-773U
Unit Size Voltage Tolerance Material
Designator
-- C2_RF, C2pIF, C3, C3_IF, C29, C30p
-- OSCin*, U1,CPLR
-- R1, R2, R2pRF, R3p, R24, R25, R26, R27p, R30, R33p
-- R100, R101, R102, R103, R104, R105, R106, C100, C101, C102
Revised – March 2014
er = 4.2
Top and Bottom Layers are 14 mil
Getek
n/a
Nylon
Place in 4 holds in edge of board
Shunt
Plastic
Place accross POWER_PLL (1-2, 3-4, 5-6, 7-8, 9-10, 11-12)
and POWER_VCO (1-2, 3-4)
4-Pin
12-Pin
10-Pin
Edge SMA
47
150
180
680
4.7
1
100
18
1
10
0
10
18
51
2.7
4.7
6.8
4.7
10
12
Inductor
Header
Header
Header
pF
pF
pF
pF
nF
nF
nF
nF
uF
uF
ohm
ohm
ohm
ohm
Kohm
Kohm
Kohm
Kohm
Kohm
Kohm
nH
MHz
0603
0603
0603
0603
0805
0603
0603
1206
0603
1206
0603
0603
0603
0603
0603
0603
0603
0603
0603
0603
603
U
50 V
50 V
50 V
25 V
16 V
25 V
25 V
16 V
25 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
10 V
3V
Plastic
Plastic
Plastic
Metal
C0G
C0G
C0G
C0G
X7R
C0G
X7R
X7R
X5R
Tantalum
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Cermaic
Ferrite
Can
POWER_VCO
POWER_PLL
uWire
Ftest/LD, IF_OUT, OSCin, RF_OUT, VccPLL, VccVCO
C12, C13, C14, C15, C16, C17, C18, C19, C22, C23, C27, C28, C30
C4_RF
C3_RF
C1_IF
C2_IF
C1_RF
C20, C21
C2pRF
C4, C5, C6, C7, C8, C9, C10, C11, C24, C25, C26
C1, C2
R3_IF, R31
R4, R5, R6, R7, R8, R9, R10, R11
R3, R27, R28, R29, R33, R34
R32
R2_RF
R3_RF
R4_RF
R2_IF
R13, R15, R17, R19, R21, R23
R12, R14, R16, R18, R20, R22
L1, L2
U2
760-780
MHz
U
3V
Can
U3
5%
5%
5%
5%
5%
5%
10%
20%
10%
10%
5%
5%
5%
1%
5%
5%
5%
5%
5%
5%
LMX248x Evaluation Board User’s Guide
Copyright © 2014, Texas Instruments Incorporated
SNAU137
33
www.ti.com
Appendix D: Quick Start for EVM Communications
Codeloader is the software used to communicate with the EVM (Please download the latest version from
TI.com - http://www.ti.com/tool/codeloader). This EVM can be controlled through the uWire interface on
board. There are two options in communicating with the uWire interface from the computer.
OPTION 1
Open Codeloader.exe  Click “Select Device”  Click “Port Setup” tab  Click “LPT” (in Communication
Mode)
OPTION 2
34
SNAU137
LMX248x Evaluation Board Instructions
Copyright © 2014, Texas Instruments Incorporated
Revised – March 2014
www.ti.com
The Adapter Board
This table describes the pins configuration on the adapter board for each EVM board (See examples below table)
Jumper Bank
Code Loader Configuration
EVM
A
B
C
D
E
F
G
H
LMX2581
A4 B1 C2
E5 F1 G1 H1 BUFEN (pin 1), Trigger (pin 7)
LMX2541
A4
C3
E4 F1 G1 H1 CE (pin 1), Trigger (pin 10)
LMK0400x
A0
C3
E5 F1 G1 H1 GOE (pin 7)
LMK01000
A0
C1
E5 F1 G1 H1 GOE (pin 7)
LMK030xx
A0
C1
E5 F1 G1 H1 SYNC (pin 7)
LMK02000
A0
C1
E5 F1 G1 H1 SYNC (pin 7)
LMK0480x
A0 B2 C3
E5 F0 G0 H1 Status_CLKin1 (pin 3)
LMK04816/4906
A0 B2 C3
E5 F0 G0 H1 Status_CLKin1 (pin 3)
LMK01801
A0 B4 C5
E2 F0 G0 H1 Test (pin 3), SYNC0 (pin 10)
LMK0482x (prelease)
A0 B5 C3 D2 E4 F0 G0 H1 CLKin1_SEL (pin 6), Reset (pin 10)
LMX2531
A0
E5 F2 G1 H2 Trigger (pin 1)
LMX2485/7
A0
C1
E5 F2 G1 H0 ENOSC (pin 7), CE (pin 10)
LMK03200
A0
E5 F0 G0 H1 SYNC (pin 7)
LMK03806
A0
C1
E5 F0 G0 H1
LMK04100
A0
C1
E5 F1 G1 H1
Example adapter configuration (LMK01801)
Open Codeloader.exe  Click “Select Device”  Click “Port Setup” Tab  Click “USB” (in Communication
Mode)
*Remember to also make modifications in “Pin Configuration” Section according to Table above
Revised – March 2014
LMX248x Evaluation Board Instructions
Copyright © 2014, Texas Instruments Incorporated
SNAU137
35
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