MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
General Description
The MAX9541/MAX9542 are quadruple-channel, 2:1
video mux amplifiers with input sync tip clamps. These
devices select between two video sources and support
up to four channels on each source. The MAX9541 has
integrated lowpass filters that are optimized for standarddefinition video signals such as composite and red, green,
blue (RGB). The filters typically have ±1dB passband
flatness out to 9.5MHz and 47dB attenuation at 27MHz.
The MAX9542 has a wider bandwidth of 15MHz because
it does not have integrated lowpass filters, making it suitable for not only standard-definition video signals, but
also video graphics array (VGA) signals with a 640 x 480
resolution at up to 85Hz refresh rate.
Video signals are AC-coupled to the inputs of the
MAX9541/MAX9542. The input sync-tip clamps set the
internal DC level.
The amplifiers have 2V/V gain, and the outputs can be
DC-coupled to a 75Ω lΩoad, which is the equivalent of
two video loads, or AC-coupled to a 150Ω load.
Both the MAX9541/MAX9542 feature a low-power shutdown mode, in which supply current is reduced to 35µA.
Features
●● Quad 2:1 Video Mux Amplifiers
●● Reconstruction Filters with 9.5MHz Passband and
47dB Attenuation at 27MHz (MAX9541)
●● Fixed Gain of 2V/V
●● Input Sync-Tip Clamps
●● Shutdown
●● 2.7V to 3.6V Single-Supply Operation
Ordering Information
PART
PIN-PACKAGE
MAX9541AEE+
16 QSOP
Yes
MAX9542AEE+
16 QSOP
No
Note: All devices are specified over the -40°C to +125°C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Applications
●● Industrial
Functional Diagram
VDD
SHDN
MAX9541
MAX9542
A/B
0
IN0A
UNKNOWN
BIAS
IN1A
LPF*
1
0
2V/V
1
0
300mV
LPF*
2V/V
LPF*
2V/V
1
0
LPF*
2V/V
*LOWPASS FILTER IN MAX9541 ONLY.
19-4457; Rev 1; 9/14
OUT2
CLAMPREF
IN2B
IN3B
OUT1
CLAMPREF
IN0B
IN1B
OUT0
CLAMPREF
IN2A
IN3A
STANDARDDEFINITION
VIDEO FILTER
1
CLAMPREF
GND
OUT3
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Absolute Maximum Ratings
Supply Voltage
VDD to GND..........................................................-0.3V to +4V
Input Pins, SHDN, A/B............................ (GND - 0.3V) to +4V
Duration of Output Short Circuit to VDD or GND.......Continuous
Continuous Input Current
Input Pins.......................................................................±20mA
Continuous Power Dissipation (TA = +70°C)
16-Pin QSOP (derate 8.3mW/°C above +70°C)..........667mW
Operating Temperature Range.......................... -40°C to +125°C
Junction Temperature.......................................................+150°C
Storage Temperature Range............................. -65°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
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.
Electrical Characteristics
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
Supply Voltage Range
VDD
Guaranteed by power-supply rejection test
Quiescent Supply Current
IDD
No load
Shutdown Supply Current
ISHDN
Input Voltage
TYP
MAX
UNITS
2.7
3.3
3.6
V
21
45
mA
35
70
µA
SHDN = A/B= GND
Unselected input
Input Resistance
Sync-Tip Clamp Level
MIN
VDD/3
Unselected input
222
VCLP
0.23
0.3
1.05
3.0V ≤ VDD ≤ 3.6V
1.2
Guaranteed by DC
voltage gain
Sync Crush
Sync-tip clamp; percentage reduction in sync
pulse (0.3VP-P); guaranteed by input clamping
current measurement
Input Clamping Current
1
Maximum Input Source
Resistance
300
DC Voltage Gain (Note 2)
AV
VDD = 2.7V,
0V ≤ VIN ≤ 1.05V
VDD = 3V,
0V ≤ VIN ≤ 1.2V
DC Gain Mismatch
Guaranteed by DC voltage gain
Output Level
Measured at VOUT, CIN_ = 0.1µF to GND
Measured at output, VDD = 2.7V, VIN = VCLP
to (VCLP +1.05V), RL = 150Ω to -0.2V
Measured at output, VDD = 2.7V, VIN = VCLP
to (VCLP +1.05V), RL = 150Ω to VDD/2
Measured at output, VDD = 3.0V, VIN = VCLP
to (VCLP +1.2V), RL = 150Ω to -0.2V
Output Voltage Swing
Measured at output, VDD = 3.0V, V­IN = VCLP
to (VCLP +1.2V), RL = 150Ω to VDD/2
Output Short-Circuit Current
Output Resistance
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ROUT
kΩ
0.39
2.7V ≤ VDD ≤ 3.6V
Input Voltage Range
RL = 150Ω to GND
(Note 2)
V
V
VP-P
2
%
2
µA
Ω
1.96
2
2.04
1.96
2
2.04
V/V
-2
0.218
0.3
+2
%
0.39
V
2.1
2.1
2.4
VP-P
2.4
Measured at output, VDD = 3.135V, VIN = VCLP
to (VCLP +1.05V), RL = 75Ω to -0.2V
2.1
Short to GND (sourcing)
140
Short to VDD (sinking)
70
VOUT = 1.5V, -10mA ≤ ILOAD ≤ +10mA
0.2
mA
Ω
Maxim Integrated │ 2
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Electrical Characteristics (continued)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = TMIN to TMAX, unless otherwise noted. Typical values
are at TA = +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
2.7V ≤ VDD ≤ 3.6V
Power-Supply Rejection Ratio
MIN
TYP
48
64
MAX
UNITS
dB
f = 100kHz, 100mVP-P
20
Small-Signal Bandwidth
VOUT = 100mVP-P (MAX9542 only)
27
MHz
Large-Signal Bandwidth
VOUT = 2VP-P (MAX9542 only)
15
MHz
Slew Rate
MAX9542 only
65
V/µs
Settling Time
Settled to within 0.1% of final value
(MAX9542 only)
75
ns
VOUT = 2VP-P, reference frequency is 100kHz,
±1dB passband flatness (MAX9541 only)
9.5
MHz
Standard-Definition
Reconstruction Filter
VOUT = 2VP-P, reference
frequency is 100kHz
(MAX9541 only)
f = 5.5MHz
0.1
f = 9.5MHz
-1
f = 10MHz
-3
f = 27MHz
-47
dB
Differential Gain
DG
5-step modulated staircase of 129mV step size
and 286mV peak-to-peak subcarrier amplitude,
f = 4.43MHz
0.4
%
Differential Phase
DP
5-step modulated staircase of 129mV step size
and 286mV peak-to-peak subcarrier amplitude,
f = 4.43MHz
0.45
deg
Group-Delay Distortion
100kHz ≤ f ≤ 5MHz, outputs are 2VP-P
9
ns
Peak Signal to RMS Noise
100kHz ≤ f ≤ 5MHz
71
dB
2T Pulse Response
2T = 200ns
0.2
K%
2T Bar Response
2T = 200ns; bar time is 18ms; the beginning
2.5%, and the ending 2.5% of the bar time is
ignored
0.2
K%
2T Pulse-to-Bar K Rating
2T = 200ns; bar time is 18ms; the beginning
2.5%, and the ending 2.5% of the bar time is
ignored
0.3
K%
Nonlinearity
5-step staircase
0.1
%
Output Impedance
f = 5.5MHz
8.07
Ω
f = 15kHz
-82
f = 4.43MHz
-78
f = 30MHz
-68
All-Hostile Crosstalk
Output-to-Input Crosstalk
LOGIC SIGNALS (TV_SEL, VCR_SEL, SHDN)
Logic-Low Threshold
VIL
Logic-High Threshold
VIH
Logic-Input Current
IIN
dB
dB
0.3 x VDD
0.7 x VDD
V
V
10
µA
Note 1: All devices are 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design.
Note 2: Voltage gain (AV) is a two-point measurement in which the output-voltage swing is divided by the input-voltage swing.
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Maxim Integrated │ 3
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Typical Operating Characteristics (MAX9541)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
-2
-3
-4
-5
-6
-7
100M
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
2
1
0
MAX9541 toc04
3
GAIN (dB)
-5
1M
10M
2 ADJACENT CHANNELS
1M
100k
10M
VIDEO PSRR
vs. FREQUENCY
VOLTAGE GAIN
vs. TEMPERATURE
VDD = 3.3V + 100mVP-P
-30
-40
-50
-60
-70
2.04
1M
10M
FREQUENCY (Hz)
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100M
2.02
2.01
2.00
1.99
1.98
-50
-25
0
25
50
MAX9541 toc03
70
60
50
40
30
20
10
1M
100k
10M
100M
FREQUENCY (Hz)
2.03
1.96
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
100
90
80
0
100M
1.97
100k
120
110
1 ADJACENT CHANNEL
FREQUENCY (Hz)
VOLTAGE GAIN (V/V)
PSRR (dB)
VIDEO GROUP DELAY DISTORTION
vs. FREQUENCY
FREQUENCY (Hz)
-20
-80
-120
100M
MAX9541 toc07
100k
100M
VIDEO CROSSTALK
vs. FREQUENCY
ALL-HOSTILE
-100
-6
10M
FREQUENCY (Hz)
-60
-80
-4
1M
100k
FREQUENCY (Hz)
MAX9541 toc08
GAIN (dB)
-3
-15
-20
-25
-30
-35
-40
-45
-50
100M
-40
-2
-10
10M
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
-20
0
-1
0
1M
100k
GROUP DELAY (ns)
10M
75
TEMPERATURE (°C)
100
125
DIFFERENTIAL PHASE (deg) DIFFERENTIAL GAIN (%)
1M
MAX9541 toc05
100k
FREQUENCY (Hz)
-7
0
-5
-10
GAIN (dB)
-1
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
MAX9541 toc06
1
10
5
0
-15
-20
-25
-30
-35
-40
-45
-50
VIN = 50mVP-P
GAIN IS NORMALIZED TO 0dB
2
GAIN (dB)
GAIN (dB)
0
-5
-10
3
MAX9541 toc02
VIN = 50mVP-P
GAIN IS NORMALIZED TO 0dB
MAX9541 toc01
10
5
LARGE-SIGNAL GAIN
vs. FREQUENCY
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
DIFFERENTIAL GAIN
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0.8
0.6
0.4
0.2
0
-0.2
-0.4
f = 3.58MHz
0
1
2
3
4
MAX9541 toc09
SMALL-SIGNAL GAIN
vs. FREQUENCY
5
DIFFERENTIAL PHASE
f = 3.58MHz
0
1
2
3
4
5
Maxim Integrated │ 4
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Typical Operating Characteristics (continued) (MAX9541)
DIFFERENTIAL GAIN
0
1
2
3
4
12.5T RESPONSE
MAX9541 toc11
MAX9541 toc12
IN
200mV/div
IN
200mV/div
OUT
400mV/div
OUT
400mV/div
5
DIFFERENTIAL PHASE
f = 4.43MHz
0
1
2
3
4
5
NTC-7 VIDEO TEST SIGNAL
MAX9541 toc13
100ns/div
400ns/div
FIELD SQUARE WAVE
VIDEO SYNC-TIP CLAMP VOLTAGE
vs. TEMPERATURE
MAX9541 toc14
IN
500mV/div
0.37
IN
500mV/div
OUT
1V/div
OUT
1V/div
MAX9541 toc15
0.8
0.6
0.4
0.2
0
-0.2
-0.4
2T RESPONSE
f = 4.43MHz
SYNC-TIP CLAMP VOLTAGE (V)
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
MAX9541 toc10
DIFFERENTIAL PHASE (deg) DIFFERENTIAL GAIN (%)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
0.36
0.35
0.34
0.33
0.32
0.31
0.30
0.29
0.28
2ms/div
10µs/div
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
1.00
0.98
0.96
0.94
0.92
0.90
-50
-25
0
25
50
75
TEMPERATURE (°C)
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100
125
300
200
100
0
-100
0
0.2
0.4
0.6
0.8
1.0
1.2
INPUT VOLTAGE (V)
1.4
1.6
MAX9541 toc18
400
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
22.0
QUIESCENT SUPPLY CURRENT (mA)
1.02
MAX9541 toc17
1.04
500
SYNC-TIP CLAMP CURRENT (µA)
MAX9541 toc16
1.06
SYNC-TIP CLAMP CURRENT (µA)
SYNC-TIP CLAMP CURRENT
vs. INPUT VOLTAGE
VIDEO SYNC-TIP CLAMP CURRENT
vs. TEMPERATURE
21.5
21.0
20.5
20.0
19.5
19.0
18.5
18.0
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
Maxim Integrated │ 5
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Typical Operating Characteristics (continued) (MAX9542)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
VIN = 50mVP-P
GAIN IS NORMALIZED TO 0dB
-5
-10
-15
1
0
-20
-25
-30
-35
-7
100M
1M
10M
100M
FREQUENCY (Hz)
LARGE-SIGNAL GAIN
vs. FREQUENCY
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
3
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
2
1
0
-20
-25
-30
-35
-1
-2
-3
-4
-5
-40
-45
-6
10M
100M
VIDEO GROUP DELAY DISTORTION
vs. FREQUENCY
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
45
40
35
30
25
20
15
10
1 ADJACENT CHANNEL
5
2 ADJACENT CHANNELS
1M
50
GROUP DELAY (ns)
ALL-HOSTILE
10M
FREQUENCY (Hz)
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10M
VIDEO CROSSTALK
vs. FREQUENCY
-60
100k
1M
FREQUENCY (Hz)
-40
-80
100k
FREQUENCY (Hz)
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
-20
-7
100M
MAX9541 toc24
1M
MAX9541 toc23
100k
0
GAIN (dB)
100k
FREQUENCY (Hz)
GAIN (dB)
GAIN (dB)
10M
MAX9541 toc22
1M
MAX9541 toc21
100k
-5
-10
-15
-120
-3
-6
0
-100
-2
-5
10
5
-50
-1
-4
-40
-45
-50
VIN = 50mVP-P
GAIN IS NORMALIZED TO 0dB
2
GAIN (dB)
GAIN (dB)
0
3
MAX9541 toc19
10
5
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9541 toc20
SMALL-SIGNAL GAIN
vs. FREQUENCY
100M
0
100k
1M
10M
100M
FREQUENCY (Hz)
Maxim Integrated │ 6
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Typical Operating Characteristics (continued) (MAX9542)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
-30
PSRR (dB)
-40
-50
-60
2.01
2.00
1.99
1.98
1.97
-70
-80
MAX9541 toc26
2.02
VOLTAGE GAIN (V/V)
-20
2.03
100k
1M
10M
1.96
100M
-25
-50
0
FREQUENCY (Hz)
0
1
2
3
4
5
1
2
3
27 RESPONSE
100ns/div
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4
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
DIFFERENTIAL
PHASE (deg)
f = 3.58MHz
0
75
100
125
5
f = 4.43MHz
DIFFERENTIAL
GAIN (%)
f = 3.58MHz
DIFFERENTIAL
GAIN (%)
DIFFERENTIAL
PHASE (deg)
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
50
DIFFERENTIAL GAIN AND PHASE
MAX9541 toc27
DIFFERENTIAL GAIN AND PHASE
0.10
0.05
0.00
-0.05
-0.10
-0.15
-0.20
25
TEMPERATURE (°C)
0.8
0.6
0.4
0.2
0.0
-0.2
-0.4
0
1
2
3
5
f = 4.43MHz
0
1
2
3
12.5T RESPONSE
MAX9541 toc29
4
MAX9541 toc28
-10
VDD = 3.3V + 100mVP-P
VOLTAGE GAIN
vs. TEMPERATURE
2.04
MAX9541 toc25
0
VIDEO PSRR
vs. FREQUENCY
4
5
MAX9541 toc30
IN
200mV/div
IN
200mV/div
OUT
400mV/div
OUT
400mV/div
400ns/div
Maxim Integrated │ 7
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Typical Operating Characteristics (continued) (MAX9542)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
NTC-7 VIDEO TEST SIGNAL
FIELD SQUARE WAVE
MAX9541 toc31
IN
500mV/div
IN
500mV/div
OUT
1V/div
OUT
1V/div
10µs/div
2ms/div
VIDEO SYNC-TIP CLAMP VOLTAGE
vs. TEMPERATURE
0.36
0.35
0.34
0.33
0.32
0.31
0.30
1.06
0.29
0.28
100ns/div
-50
-25
0
25
50
75
100
VIDEO SYNC-TIP CLAMP CURRENT
vs. TEMPERATURE
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
125
MAX9541 toc35
MAX9541 toc34
SYNC-TIP CLAMP VOLTAGE (V)
OUTPUT (700mV/div)
INPUT (700mV/div)
MAX9541 toc33
0.37
SYNC-TIP CLAMP CURRENT (µA)
PULSE RESPONSE
-50
-25
0
TEMPERATURE (°C)
SYNC-TIP CLAMP CURRENT
vs. INPUT VOLTAGE
300
200
100
0
-100
0
0.2
0.4
0.6
0.8
1.0
INPUT VOLTAGE (V)
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1.2
1.4
1.6
50
75
100
125
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX9541 toc37
400
25
TEMPERATURE (°C)
22.0
QUIESCENT SUPPLY CURRENT (mA)
MAX9541 toc36
SYNC-TIP CLAMP CURRENT (µA)
500
MAX9541 toc32
21.5
21.0
20.5
20.0
19.5
19.0
18.5
18.0
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
Maxim Integrated │ 8
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Pin Description
PIN
NAME
1
IN0A
Video Input A Channel 0
FUNCTION
2
IN1A
Video Input A Channel 1
3
IN2A
Video Input A Channel 2
4
IN3A
Video Input A Channel 3
5
IN0B
Video Input B Channel 0
6
IN1B
Video Input B Channel 1
7
IN2B
Video Input B Channel 2
8
IN3B
Video Input B Channel 3
9
GND
Ground
10
SHDN
Shutdown Logic Input. Connect to GND to place the device in shutdown. Connect to VDD for
normal operation.
11
OUT3
Video Output Channel 3
12
OUT2
Video Output Channel 2
13
OUT1
Video Output Channel 1
14
OUT0
Video Output Channel 0
15
A/B
Input Select. Connect to GND to select Video Input A as the video source. Connect to VDD to select
Video Input B as the video source.
16
VDD
Positive Power Supply. Bypass to GND with a 0.1µF capacitor.
Detailed Description
The MAX9541 selects between two standard-definition
video sources that can each have up to four video signals,
for example, RGB with composite sync (RGBS) or RGB
with sync-on-green. See Figure 1. It is also possible to
select between two sets of four composite video signals
with blanking and sync (CVBS). With its integrated lowpass filter (10MHz large-signal -3dB bandwidth typical),
the MAX9541 can provide the anti-alias filtering before
an analog-to-digital converter (ADC) or the reconstruction filtering after a digital-to-analog converter (DAC). The
incoming video signals can have any DC bias because
the MAX9541 has input sync-tip clamps which restore
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the DC level. The output amplifiers have a gain of 2V/V.
The MAX9541 operates from a single 3.3V supply and
consumes low quiescent power and low average power.
In addition, the device also has shutdown mode.
The MAX9542 is similar to the MAX9541 except that it
does not have the integrated lowpass filter. As a result,
the typical, large-signal bandwidth of the MAX9541 is
15MHz. Therefore, it can select between two video sources that can each have up to four video signals that are
standard definition or VGA. A standard-definition signal
set would be RGB with composite sync. A VGA signal set
would be RGB with a 640 x 480 resolution and up to 85Hz
refresh rate. See Figure 2.
Maxim Integrated │ 9
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
VDD
MAX9541
NAVIGATION
COMPUTER
COMPOSITE
SYNC
A/B
0.1µF
IN0A
75Ω
0.1µF
RED
LPF
2V/V
LPF
2V/V
LPF
2V/V
LPF
2V/V
OUT0
75Ω
DISPLAY
PANEL
COMPOSITE
SYNC
CLAMPREF
IN1A
75Ω
CLAMPREF
0.1µF
IN2A
GREEN
75Ω
0.1µF
BLUE
COMPOSITE
SYNC
IN3A
CLAMPREF
IN0B
75Ω
0.1µF
RED
RED
75Ω
CLAMPREF
75Ω
0.1µF
OUT1
OUT2
GREEN
75Ω
CLAMPREF
IN1B
75Ω
CLAMPREF
0.1µF
IN2B
GREEN
75Ω
0.1µF
BLUE
VIDEO SOURCE
75Ω
OUT3
BLUE
75Ω
CLAMPREF
IN3B
CLAMPREF
GND
Figure 1. The MAX9541 selects between two sources of RGB with composite sync, filters the signals, and drives the signals into a
display panel.
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Maxim Integrated │ 10
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
VDD
MAX9542
MONITOR
PC NO. 1
A/B
0.1µF
RED
IN0A
2V/V
OUT0
RED
75Ω
75Ω
0.1µF
GREEN
CLAMPREF
IN1A
75Ω
CLAMPREF
0.1µF
IN2A
BLUE
2V/V
75Ω
0.1µF
NOT
USED
0.1µF
IN3A
CLAMPREF
IN0B
2V/V
0.1µF
OUT2
BLUE
75Ω
75Ω
GREEN
GREEN
75W
CLAMPREF
75Ω
RED
OUT1
CLAMPREF
IN1B
75Ω
CLAMPREF
0.1µF
IN2B
BLUE
75Ω
PC NO. 2
NOT
USED
0.1µF
75Ω
2V/V
OUT3
75Ω
NOT
USED
CLAMPREF
IN3B
CLAMPREF
GND
Figure 2. The MAX9542 Selecting Between Two VGA Sources
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Maxim Integrated │ 11
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Operating Modes
A/B controls whether Video Input A or Video Input B is
selected. See Table 1.
SHDN controls whether the device is on or off. See Table 2.
In shutdown, the outputs are in high impedance.
Input
Each video source can provide up to four video signals.
Every video signal must be AC-coupled to the MAX9541/
MAX9542 through 0.1µF capacitors. The MAX9541/
MAX9542 have sync-tip clamps and bias circuits to
restore the DC level of the video signal after the input
coupling capacitor. When a video input is selected, the
input has a sync-tip clamp, which accepts video signals
that have sync pulses or that reach their minimum level
during sync. Composite video with blanking and sync
(CVBS) is an example of a video signal with sync pulses.
The red, green, and blue signals in an RGBS signal set
are examples of signals that return to their blank level during sync. The sync-tip voltage is internally set to 300mV.
When a video input is not selected, the inputs to the
MAX9541/MAX9542 do not distort the video signal in
case the video source is driving video signals to another
video circuit such as a video multiplexer. The inputs are
biased at VDD/3, which is sufficiently above ground so
that the ESD diodes never forward bias as the video
signal changes. The input resistance is 220kΩ, which
presents negligible loading on the video current DAC. The
sole exception to this condition is IN3A, in which the input
circuit is always a sync-tip clamp. Table 3 summarizes
which input circuit is active, dependent upon A/B.
In shutdown mode (SHDN = LOW), a bias circuit is active
on every input.
Table 1. A/B Logic
LOGIC STATE
MODE
Low
Video Input A
High
Video Input B
Table 2. SHDN Logic
LOGIC STATE
MODE
Low
Off
High
On
Multiplexer
The MAX9541/MAX9542 have quadruple 2:1 multiplexers
to select between either Video Input A or Video Input B as
the source of the video signal. When A/B is connected to
GND, Video Input A is the video source. When A/B is connected to VDD, Video Input B is the video source.
Video Filter
The MAX9541 filter features ±1dB passband out to
9.5MHz and 47dB attenuation at 27MHz, making the
filter suitable for standard-definition video signals from
all sources (e.g., broadcast and DVD). Broadcast video
signals are channel limited: NTSC signals have 4.2MHz
bandwidth, and PAL signals have 5MHz bandwidth.
Video signals from a DVD player, however, are not channel limited; so the bandwidth of DVD video signals can
approach the Nyquist limit of 6.75MHz. Recommendation:
ITU-R BT.601-5 specifies 13.5MHz as the sampling rate
for standard-definition video. Therefore, the maximum
bandwidth of the signal is 6.75MHz. To ease the filtering
requirements, most modern video systems oversample
by two times, clocking the video current DAC at 27MHz.
The MAX9542 does not have a filter.
Table 3. Input Circuit of Input as Determined by State of A/B (SHDN = HIGH)
INPUT
INPUT CIRCUIT
A/B = LOW
INPUT CIRCUIT
A/B = HIGH
IN0A
Sync-tip clamp
Bias
IN1A
Sync-tip clamp
Bias
IN2A
Sync-tip clamp
Bias
IN3A
Sync-tip clamp
Sync-tip clamp
IN0B
Bias
Sync-tip clamp
IN1B
Bias
Sync-tip clamp
IN2B
Bias
Sync-tip clamp
IN3B
Bias
Sync-tip clamp
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Maxim Integrated │ 12
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Table 4. Quiescent and Average Power Consumption
MEASUREMENT
POWER CONSUMPTION (mW)
CONDITIONS
Quiescent power consumption
69
No load.
Average power consumption
175
150Ω to ground on each output. 50% flat field signal on
each input.
Outputs
Power Consumption
If the supply voltage is greater than 3.135V (5% below a
3.3V supply), each amplifier can drive two DC-coupled
video loads to ground. If the supply is less than 3.135V,
each amplifier can drive only one DC-coupled or
AC-coupled video load.
Average power consumption represents the normal power
consumption when the devices drive real video signals
into real video loads. It is measured when the MAX9541/
MAX9542 drive 150Ω loads to ground with a 50% flat
field, which serves as proxy for a real video signal.
Applications Information
Table 4 shows the quiescent and average power consumption of the MAX9541/MAX9542.
The video output amplifiers can both source and
sink load current, allowing output loads to be DC- or
AC-coupled. The amplifier output stage needs approximately 300mV of headroom from either supply rail. The
devices have an internal level-shift circuit that positions
the sync tip at approximately 300mV at the output.
AC-Coupling the Outputs
The outputs can be AC-coupled since the output stage
can source and sink current as shown in Figure 3.
Coupling capacitors should be 220µF or greater to keep
the highpass filter, formed by the 150Ω equivalent resistance of the video transmission line, to a corner frequency
of 4.8Hz or below. The frame rate of PAL systems is
25Hz, the frame rate of NTSC systems is 30Hz, and the
frame rate of VGA is usually 60Hz or higher. The corner
frequency should be well below the frame rate.
Pin Configuration
The quiescent power consumption and average power
consumption of the MAX9541/MAX9542 are very low
because of 3.3V operation and low-power circuit design.
Quiescent power consumption is defined when the
MAX9541/MAX9542 are operating without loads and
without any video signals.
Power-Supply Bypassing and Ground
The MAX9541/MAX9542 operate from a single-supply
voltage down to 2.7V, allowing for low-power operation.
Bypass VDD to GND with a 0.1µF capacitor. Place all
external components as close as possible to the device.
Chip Information
PROCESS: BiCMOS
TOP VIEW
IN0A 1
+
16 VDD
15 A/B
IN1A 2
IN2A 3
IN3A 4
MAX9541
MAX9542
14 OUT0
13 OUT1
IN0B 5
12 OUT2
IN1B 6
11 OUT3
IN2B 7
10 SHDN
IN3B 8
9
GND
QSOP
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Maxim Integrated │ 13
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
+3.3V
0.1µF
SHDN
VDD
A/B
MAX9541
MAX9542
0
0.1µF
BUFFER
IN0A
LPF*
1
75Ω
0.1µF
VIDEO SOURCE A
4 CVBS SIGNALS
75Ω
IN1A
0
0.1µF
BUFFER
IN2A
LPF*
1
75Ω
2V/V
220µF
OUT1
75Ω
CLAMPREF
IN3A
75Ω
0.1µF
220µF
OUT0
CLAMPREF
75Ω
0.1µF
2V/V
0
BUFFER
IN0B
LPF*
1
75Ω
2V/V
220µF
OUT2
75Ω
CLAMPREF
0.1µF
VIDEO SOURCE B
4 CVBS SIGNALS
IN1B
75Ω
0
0.1µF
BUFFER
IN2B
LPF*
1
75Ω
2V/V
220µF
OUT3
75Ω
CLAMPREF
0.1µF
IN3B
75Ω
*LOWPASS FILTER MAX9451 ONLY.
GND
Figure 3. AC-Coupled Outputs
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Maxim Integrated │ 14
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Typical Application Circuit
+3.3V
0.1µF
SHDN
VDD
A/B
0
0.1µF
MAX9541
MAX9542
BUFFER
IN0A
LPF*
1
75Ω
0.1µF
VIDEO SOURCE A
4 CVBS SIGNALS
75Ω
IN1A
0
0.1µF
BUFFER
IN2A
LPF*
1
75Ω
2V/V
OUT1
75Ω
CLAMPREF
IN3A
75Ω
0.1µF
OUT0
CLAMPREF
75Ω
0.1µF
2V/V
VIDEO OUTPUT
4 CVBS SIGNALS
0
BUFFER
IN0B
LPF*
1
75Ω
2V/V
OUT2
75Ω
CLAMPREF
0.1µF
VIDEO SOURCE B
4 CVBS SIGNALS
IN1B
75Ω
0
0.1µF
BUFFER
IN2B
LPF*
1
7Ω
2V/V
OUT3
75Ω
CLAMPREF
0.1µF
IN3B
75Ω
*LOWPASS FILTER MAX9451 ONLY.
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GND
Maxim Integrated │ 15
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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.
16 QSOP
E16-4
21-0055
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Maxim Integrated │ 16
MAX9541/MAX9542
Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Revision History
REVISION
NUMBER
REVISION
DATE
0
2/09
Initial release
—
1
9/14
Updated Applications section
1
DESCRIPTION
PAGES
CHANGED
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2014 Maxim Integrated Products, Inc. │ 17