maxim
integrated ,,
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 standard-
definition 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 suit-
able 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 shut-
down mode, in which supply current is reduced to 35µA.
Applications
●Industrial
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
19-4457; Rev 1; 9/14
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
PART PIN-PACKAGE
STANDARD-
DEFINITION
VIDEO FILTER
MAX9541AEE+ 16 QSOP Yes
MAX9542AEE+ 16 QSOP No
UNKNOWN
BIAS 300mV
IN2A
IN3A
OUT1
IN1A
IN0A OUT0
OUT3
OUT2
IN3B
IN2B
IN1B
IN0B
A/B
0
1
0
1
0
1
0
1
VDD
GND
MAX9541
MAX9542
SHDN
LPF*
CLAMPREF
2V/V
LPF*
CLAMPREF
2V/V
LPF*
CLAMPREF
2V/V
LPF*
CLAMPREF
2V/V
*LOWPASS FILTER IN MAX9541 ONLY.
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Functional Diagram
Ordering Information
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
(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 MIN TYP MAX UNITS
Supply Voltage Range VDD Guaranteed by power-supply rejection test 2.7 3.3 3.6 V
Quiescent Supply Current IDD No load 21 45 mA
Shutdown Supply Current ISHDN SHDN = A/B= GND 35 70 µA
Input Voltage Unselected input VDD/3 V
Input Resistance Unselected input 222 kΩ
Sync-Tip Clamp Level VCLP 0.23 0.3 0.39 V
Input Voltage Range Guaranteed by DC
voltage gain
2.7V ≤ VDD ≤ 3.6V 1.05 VP-P
3.0V ≤ VDD ≤ 3.6V 1.2
Sync Crush
Sync-tip clamp; percentage reduction in sync
pulse (0.3VP-P); guaranteed by input clamping
current measurement
2 %
Input Clamping Current 1 2 µA
Maximum Input Source
Resistance 300 Ω
DC Voltage Gain (Note 2) AVRL = 150Ω to GND
(Note 2)
VDD = 2.7V,
0V ≤ VIN ≤ 1.05V 1.96 2 2.04
V/V
VDD = 3V,
0V ≤ VIN ≤ 1.2V 1.96 2 2.04
DC Gain Mismatch Guaranteed by DC voltage gain -2 +2 %
Output Level Measured at VOUT, CIN_ = 0.1µF to GND 0.218 0.3 0.39 V
Output Voltage Swing
Measured at output, VDD = 2.7V, VIN = VCLP
to (VCLP +1.05V), RL = 150Ω to -0.2V 2.1
VP-P
Measured at output, VDD = 2.7V, VIN = VCLP
to (VCLP +1.05V), RL = 150Ω to VDD/2 2.1
Measured at output, VDD = 3.0V, VIN = VCLP
to (VCLP +1.2V), RL = 150Ω to -0.2V 2.4
Measured at output, VDD = 3.0V, V IN = VCLP
to (VCLP +1.2V), RL = 150Ω to VDD/2 2.4
Measured at output, VDD = 3.135V, VIN = VCLP
to (VCLP +1.05V), RL = 75Ω to -0.2V 2.1
Output Short-Circuit Current Short to GND (sourcing) 140 mA
Short to VDD (sinking) 70
Output Resistance ROUT VOUT = 1.5V, -10mA ≤ ILOAD ≤ +10mA 0.2 Ω
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
www.maximintegrated.com Maxim Integrated
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Absolute Maximum Ratings
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)
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.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Power-Supply Rejection Ratio 2.7V ≤ VDD ≤ 3.6V 48 64 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
Standard-Definition
Reconstruction Filter
VOUT = 2VP-P, reference frequency is 100kHz,
±1dB passband flatness (MAX9541 only) 9.5 MHz
VOUT = 2VP-P, reference
frequency is 100kHz
(MAX9541 only)
f = 5.5MHz 0.1
dB
f = 9.5MHz -1
f = 10MHz -3
f = 27MHz -47
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
All-Hostile Crosstalk f = 15kHz -82 dB
f = 4.43MHz -78
Output-to-Input Crosstalk f = 30MHz -68 dB
LOGIC SIGNALS (TV_SEL, VCR_SEL, SHDN)
Logic-Low Threshold VIL 0.3 x VDD V
Logic-High Threshold VIH 0.7 x VDD V
Logic-Input Current IIN 10 µA
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
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Electrical Characteristics (continued)
E2 Zia :5 3mg 135
E3 2:5 59 2:5
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9541 toc02
FREQUENCY (Hz)
GAIN (dB)
10M1M
-6
-5
-4
-3
-2
-1
0
1
2
3
-7
100k 100M
VIN = 50mVP-P
GAIN IS NORMALIZED TO 0dB
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX9541 toc03
FREQUENCY (Hz)
GAIN (dB)
10M1M
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
-50
100k 100M
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9541 toc04
FREQUENCY (Hz)
GAIN (dB)
10M1M
-6
-5
-4
-3
-2
-1
0
1
2
3
-7
100k 100M
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
VIDEO CROSSTALK
vs. FREQUENCY
MAX9541 toc05
FREQUENCY (Hz)
GAIN (dB)
10M1M
-100
-80
-60
-40
-20
0
-120
100k 100M
ALL-HOSTILE
1 ADJACENT CHANNEL
2 ADJACENT CHANNELS
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
VIDEO GROUP DELAY DISTORTION
vs. FREQUENCY
MAX9541 toc06
FREQUENCY (Hz)
GROUP DELAY (ns)
10M1M
10
20
30
40
50
60
70
80
90
100
110
120
0
100k 100M
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
VIDEO PSRR
vs. FREQUENCY
MAX9541 toc07
FREQUENCY (Hz)
PSRR (dB)
10M1M
-70
-60
-50
-40
-30
-20
-10
0
-80
100k 100M
VDD = 3.3V + 100mVP-P
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9541 toc01
FREQUENCY (Hz)
GAIN (dB)
10M1M
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
-50
100k 100M
VIN = 50mVP-P
GAIN IS NORMALIZED TO 0dB
VOLTAGE GAIN
vs. TEMPERATURE
MAX9541 toc08
TEMPERATURE (°C)
VOLTAGE GAIN (V/V)
10075-25 0 25 50
1.97
1.98
1.99
2.00
2.01
2.02
2.03
2.04
1.96
-50 125
DIFFERENTIAL GAIN
MAX9541 toc09
DIFFERENTIAL PHASE (deg)
10 32 4 5
0.6
0.8
0.4
0.2
0
-0.2
-0.4
DIFFERENTIAL GAIN (%)
0
0.1
-0.1
-0.2
-0.3
-0.4
-0.5
DIFFERENTIAL PHASE
10 32 4 5
f = 3.58MHz
f = 3.58MHz
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Maxim Integrated
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www.maximintegrated.com
Typical Operating Characteristics (MAX9541)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
DIFFERENTIAL GAIN
MAX9541 toc10
DIFFERENTIAL PHASE (deg)
10 32 4 5
0.6
0.8
0.4
0.2
0
-0.2
-0.4
DIFFERENTIAL GAIN (%)
0
0.1
-0.1
-0.2
-0.3
-0.4
-0.5
DIFFERENTIAL PHASE
10 32 4 5
f = 4.43MHz
f = 4.43MHz
100ns/div
2T RESPONSE
IN
200mV/div
MAX9541 toc11
OUT
400mV/div
400ns/div
12.5T RESPONSE
IN
200mV/div
MAX9541 toc12
OUT
400mV/div
10µs/div
NTC-7 VIDEO TEST SIGNAL
IN
500mV/div
MAX9541 toc13
OUT
1V/div
2ms/div
FIELD SQUARE WAVE
IN
500mV/div
MAX9541 toc14
OUT
1V/div
VIDEO SYNC-TIP CLAMP VOLTAGE
vs. TEMPERATURE
MAX9541 toc15
TEMPERATURE (°C)
SYNC-TIP CLAMP VOLTAGE (V)
1007525 500-25
0.29
0.30
0.31
0.32
0.33
0.34
0.35
0.36
0.37
0.28
-50 125
VIDEO SYNC-TIP CLAMP CURRENT
vs. TEMPERATURE
MAX9541 toc16
TEMPERATURE (°C)
SYNC-TIP CLAMP CURRENT (µA)
10075-25 0 25 50
0.92
0.94
0.96
0.98
1.00
1.02
1.04
1.06
0.90
-50 125
-100
0
100
200
300
400
500
0 0.40.2 0.6 0.8 1.0 1.2 1.4 1.6
SYNC-TIP CLAMP CURRENT
vs. INPUT VOLTAGE
MAX9541 toc17
INPUT VOLTAGE (V)
SYNC-TIP CLAMP CURRENT (µA)
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX9541 toc18
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (mA)
10075-25 0 25 50
18.5
19.0
19.5
20.0
20.5
21.0
21.5
22.0
18.0
-50 125
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Maxim Integrated
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www.maximintegrated.com
Typical Operating Characteristics (continued) (MAX9541)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9541 toc19
FREQUENCY (Hz)
GAIN (dB)
1M 10M
-40
-30
-20
-10
0
10
-50
-35
-25
-15
-5
5
-45
100k 100M
VIN = 50mVP-P
GAIN IS NORMALIZED TO 0dB
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9541 toc20
FREQUENCY (Hz)
GAIN (dB)
1M 10M
-6
-4
-2
-1
1
3
-7
-5
-3
0
2
100k 100M
VIN = 50mVP-P
GAIN IS NORMALIZED TO 0dB
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX9541 toc21
FREQUENCY (Hz)
GAIN (dB)
1M 10M
-40
-30
-20
-10
0
10
-50
-35
-25
-15
-5
5
-45
100k 100M
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9541 toc22
FREQUENCY (Hz)
GAIN (dB)
1M 10M
-6
-4
-2
-1
1
3
-7
-5
-3
0
2
100k 100M
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
VIDEO CROSSTALK
vs. FREQUENCY
MAX9541 toc23
FREQUENCY (Hz)
GAIN (dB)
1M 10M
-100
-60
-20
0
-120
-80
-40
100k 100M
2 ADJACENT CHANNELS
1 ADJACENT CHANNEL
ALL-HOSTILE
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
VIDEO GROUP DELAY DISTORTION
vs. FREQUENCY
MAX9541 toc24
FREQUENCY (Hz)
GROUP DELAY (ns)
1M 10M
5
15
25
30
40
50
0
10
20
35
45
100k 100M
VIN = 1VP-P
GAIN IS NORMALIZED TO 0dB
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Maxim Integrated
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Typical Operating Characteristics (continued) (MAX9542)
MN V
.aml,.w»‘V\/\~
unlrw
N
WW
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
VIDEO PSRR
vs. FREQUENCY
MAX9541 toc25
FREQUENCY (Hz)
PSRR (dB)
1M 10M
-50
-40
-20
0
-80
-60
-70
-30
-10
100k 100M
VDD = 3.3V + 100mVP-P
VOLTAGE GAIN
vs. TEMPERATURE
MAX9541 toc26
TEMPERATURE (°C)
VOLTAGE GAIN (V/V)
10075-25 0 25 50
1.97
1.98
1.99
2.00
2.01
2.02
2.03
2.04
1.96
-50 125
DIFFERENTIAL GAIN AND PHASE
MAX9541 toc27
DIFFERENTIAL
PHASE (deg)
1 2
0.2
0.4
0.8
-0.4
0.0
-0.2
0.6
DIFFERENTIAL
GAIN (%)
-0.05
0.00
0.10
-0.20
-0.10
-0.15
0.05
0 3 4 5
1 20 3 4 5
f = 3.58MHz
f = 3.58MHz
DIFFERENTIAL GAIN AND PHASE
MAX9541 toc28
DIFFERENTIAL
PHASE (deg)
1 2
0.2
0.4
0.8
-0.4
0.0
-0.2
0.6
DIFFERENTIAL
GAIN (%)
-0.05
0.00
0.10
-0.20
-0.10
-0.15
0.05
0 3 4 5
1 20 3 4 5
f = 4.43MHz
f = 4.43MHz
27 RESPONSE
MAX9541 toc29
100ns/div
IN
200mV/div
OUT
400mV/div
12.5T RESPONSE
MAX9541 toc30
400ns/div
IN
200mV/div
OUT
400mV/div
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Maxim Integrated
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www.maximintegrated.com
Typical Operating Characteristics (continued) (MAX9542)
AL
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150Ω to GND, TA = +25°C.)
NTC-7 VIDEO TEST SIGNAL
MAX9541 toc31
10µs/div
IN
500mV/div
OUT
1V/div
FIELD SQUARE WAVE
MAX9541 toc32
2ms/div
IN
500mV/div
OUT
1V/div
PULSE RESPONSE
MAX9541 toc33
100ns/div
INPUT (700mV/div)OUTPUT (700mV/div)
VIDEO SYNC-TIP CLAMP CURRENT
vs. TEMPERATURE
MAX9541 toc35
TEMPERATURE (°C)
SYNC-TIP CLAMP CURRENT (µA)
10075-25 0 25 50
0.92
0.94
0.96
0.98
1.00
1.02
1.04
1.06
0.90
-50 125
VIDEO SYNC-TIP CLAMP VOLTAGE
vs. TEMPERATURE
MAX9541 toc34
TEMPERATURE (°C)
SYNC-TIP CLAMP VOLTAGE (V)
1007525 500-25
0.29
0.30
0.31
0.32
0.33
0.34
0.35
0.36
0.37
0.28
-50 125
SYNC-TIP CLAMP CURRENT
vs. INPUT VOLTAGE
MAX9541 toc36
INPUT VOLTAGE (V)
SYNC-TIP CLAMP CURRENT (µA)
0.40.2
0
200
400
500
-100
300
100
0 1.00.80.6 1.61.41.2
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX9541 toc37
TEMPERATURE (°C)
QUIESCENT SUPPLY CURRENT (mA)
10075-25 0 25 50
18.5
19.0
19.5
20.0
20.5
21.0
21.5
22.0
18.0
-50 125
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
Maxim Integrated
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Typical Operating Characteristics (continued) (MAX9542)
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 low-
pass filter (10MHz large-signal -3dB bandwidth typical),
the MAX9541 can provide the anti-alias filtering before
an analog-to-digital converter (ADC) or the reconstruc-
tion 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
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 sourc-
es 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.
PIN NAME FUNCTION
1 IN0A Video Input A Channel 0
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.
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
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Pin Description
W‘WM
W‘WM
C ““““““““ wk “““““““ wx %
fig;
Figure 1. The MAX9541 selects between two sources of RGB with composite sync, filters the signals, and drives the signals into a
display panel.
IN2A
IN3A
OUT1
IN1A
IN0A OUT0
OUT3
OUT2
IN3B
IN2B
IN1B
IN0B
A/B
VDD
GND
MAX9541
LPF
CLAMPREF
2V/V
CLAMPREF
CLAMPREF
LPF 2V/V
LPF 2V/V
LPF 2V/V
COMPOSITE
SYNC
RED
GREEN
BLUE
DISPLAY
PANEL
CLAMPREF
CLAMPREF
CLAMPREF
CLAMPREF
CLAMPREF
COMPOSITE
SYNC
RED
GREEN
BLUE
VIDEO SOURCE
COMPOSITE
SYNC
RED
GREEN
BLUE
NAVIGATION
COMPUTER
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
75Ω
75Ω
75Ω
75Ω
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
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: 9 ; 9
33%
Figure 2. The MAX9542 Selecting Between Two VGA Sources
IN2A
IN3A
OUT1
IN1A
IN0A OUT0
OUT3
OUT2
IN3B
IN2B
IN1B
IN0B
A/B
VDD
GND
MAX9542
CLAMPREF
2V/V
CLAMPREF
CLAMPREF
2V/V
2V/V
2V/V
RED
GREEN
BLUE
MONITOR
CLAMPREF
CLAMPREF
CLAMPREF
CLAMPREF
CLAMPREF
RED
GREEN
BLUE
PC NO. 2
RED
GREEN
BLUE
PC NO. 1
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
NOT
USED
NOT
USED
NOT
USED
75Ω
75W
75Ω
75Ω
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
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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 dur-
ing 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.
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 con-
nected 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 chan-
nel 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 1. A/B Logic
Table 2. SHDN Logic
Table 3. Input Circuit of Input as Determined by State of A/B (SHDN = HIGH)
LOGIC STATE MODE
Low Video Input A
High Video Input B
LOGIC STATE MODE
Low Off
High On
INPUT INPUT CIRCUIT
A/B = LOW
INPUT CIRCUIT
A/B = HIGH
IN0A Sync-tip clampBias
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
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
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Outputs
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 approxi-
mately 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.
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.
Applications Information
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 resis-
tance 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.
Power Consumption
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.
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.
Table 4 shows the quiescent and average power con-
sumption of the MAX9541/MAX9542.
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.
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.
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
IN0A VDD
A/B
OUT0
OUT1
OUT2
OUT3
SHDN
GND
TOP VIEW
MAX9541
MAX9542
QSOP
IN1A
IN2A
IN1B
IN3A
IN0B
IN2B
IN3B
+
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
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Pin Configuration Chip Information
PROCESS: BiCMOS
,,,,,,,,,,,,,,,,,,,,,
Figure 3. AC-Coupled Outputs
IN2A
IN3A
OUT1
IN1A
IN0A OUT0
OUT3
OUT2
IN3B
IN2B
IN1B
IN0B
A/B
VDD
GND
MAX9541
MAX9542
CLAMPREF
2V/V
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
75Ω
75Ω
75Ω
75Ω
220µF
220µF
220µF
220µF
LPF*
CLAMPREF
CLAMPREF
CLAMPREF
2V/V
LPF*
2V/V
LPF*
2V/V
LPF*
1
0
1
0
1
0
1
0
0.1µF
SHDN
VIDEO SOURCE B
4 CVBS SIGNALS
VIDEO SOURCE A
4 CVBS SIGNALS
+3.3V
BUFFER
BUFFER
BUFFER
BUFFER
*LOWPASS FILTER MAX9451 ONLY.
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
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IN2A
IN3A
OUT1
IN1A
IN0A OUT0
OUT3
OUT2
IN3B
IN2B
IN1B
IN0B
A/B
VDD
GND
MAX9541
MAX9542
CLAMPREF
2V/V
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
7Ω
75Ω
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
0.1µF
75Ω
75Ω
75Ω
75Ω
LPF*
CLAMPREF
CLAMPREF
CLAMPREF
2V/V
LPF*
2V/V
LPF*
2V/V
LPF*
1
0
1
0
1
0
1
0
0.1µF
SHDN
VIDEO SOURCE B
4 CVBS SIGNALS
VIDEO SOURCE A
4 CVBS SIGNALS
+3.3V
VIDEO OUTPUT
4 CVBS SIGNALS
BUFFER
BUFFER
BUFFER
BUFFER
*LOWPASS FILTER MAX9451 ONLY.
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
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16 QSOP E16-4 21-0055
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
www.maximintegrated.com Maxim Integrated
│
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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.
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.
MAX9541/MAX9542 Quadruple, 2:1, Mux Amplifiers for
Standard-Definition and VGA Signals
© 2014 Maxim Integrated Products, Inc.
│
17
REVISION
NUMBER
REVISION
DATE DESCRIPTION PAGES
CHANGED
0 2/09 Initial release —
1 9/14 Updated Applications section 1
Revision History
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.
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