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19-4457; Rev 0; 2/09
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 75 load, which is the equivalent of two video loads, or AC-coupled to a 150 load. Both the MAX9541/MAX9542 feature a low-power shutdown mode, in which supply current is reduced to 35A. 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
Features
MAX9541/MAX9542
Ordering Information
PART MAX9541AEE+ MAX9542AEE+ PIN-PACKAGE 16 QSOP 16 QSOP STANDARDDEFINITION VIDEO FILTER Yes
No Note: All devices are specified over the -40C to +125C operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Applications
Automotive Infotainment
Functional Diagram
VDD SHDN
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A/B 0 IN0A LPF* 1 IN1A UNKNOWN BIAS IN2A IN3A 1 CLAMPREF 0 IN0B 1 IN1B CLAMPREF 0 IN2B 1 IN3B CLAMPREF LPF* 2V/V OUT3 LPF* 2V/V OUT2 LPF* 2V/V CLAMPREF 0 OUT1 300mV
MAX9541 MAX9542
2V/V
OUT0
GND *LOWPASS FILTER IN MAX9541 ONLY.
________________________________________________________________ Maxim Integrated Products
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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.
Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
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 = +70C) 16-Pin QSOP (derate 8.3mW/C above +70C)...........667mW Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = 150 to GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Supply Voltage Range Quiescent Supply Current Shutdown Supply Current Input Voltage Input Resistance Sync-Tip Clamp Level Input Voltage Range VCLP Guaranteed by DC voltage gain 2.7V VDD 3.6V 3.0V VDD 3.6V Sync-tip clamp; percentage reduction in sync pulse (0.3VP-P); guaranteed by input clamping current measurement 1 300 VDD = 2.7V, 0V VIN 1.05V VDD = 3V, 0V VIN 1.2V 1.96 1.96 -2 0.218 0.3 2.1 2.1 2.4 2.4 2.1 140 70 0.2 mA VP-P 2 2 2.04 V/V 2.04 +2 0.39 % V SYMBOL VDD IDD ISHDN No load SHDN = A/B= GND Unselected input Unselected input 0.23 CONDITIONS Guaranteed by power-supply rejection test MIN 2.7 TYP 3.3 21 35 VDD/3 222 0.3 0.39 1.05 1.2 2 2 MAX 3.6 45 70 UNITS V mA A V k V VP-P
Sync Crush Input Clamping Current Maximum Input Source Resistance
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% A
DC Voltage Gain (Note 2)
AV
RL = 150 to GND (Note 2)
DC Gain Mismatch Output Level
Guaranteed by DC voltage gain Measured at VOUT, CIN_ = 0.1F to GND Measured at output, VDD = 2.7V, VIN = VCLP to (VCLP +1.05V), RL = 150 to -0.2V Measured at output, VDD = 2.7V, VIN = VCLP to (VCLP +1.05V), RL = 150 to VDD/2
Output Voltage Swing
Measured at output, VDD = 3.0V, VIN = VCLP to (VCLP +1.2V), RL = 150 to -0.2V Measured at output, VDD = 3.0V, VIN = VCLP to (VCLP +1.2V), RL = 150 to VDD/2 Measured at output, VDD = 3.135V, VIN = VCLP to (VCLP +1.05V), RL = 75 to -0.2V
Output Short-Circuit Current Output Resistance ROUT
Short to GND (sourcing) Short to VDD (sinking) VOUT = 1.5V, -10mA ILOAD +10mA
2
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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 = 150 to GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Power-Supply Rejection Ratio Small-Signal Bandwidth Large-Signal Bandwidth Slew Rate Settling Time SYMBOL CONDITIONS 2.7V VDD 3.6V f = 100kHz, 100mVP-P VOUT = 100mVP-P (MAX9542 only) VOUT = 2VP-P (MAX9542 only) MAX9542 only Settled to within 0.1% of final value (MAX9542 only) VOUT = 2VP-P, reference frequency is 100kHz, 1dB passband flatness (MAX9541 only) Standard-Definition Reconstruction Filter f = 5.5MHz VOUT = 2VP-P, reference frequency is 100kHz (MAX9541 only) f = 9.5MHz f = 10MHz f = 27MHz Differential Gain DG 5-step modulated staircase of 129mV step size and 286mV peak-to-peak subcarrier amplitude, f = 4.43MHz 5-step modulated staircase of 129mV step size and 286mV peak-to-peak subcarrier amplitude, f = 4.43MHz 100kHz f 5MHz, outputs are 2VP-P 100kHz f 5MHz 2T = 200ns 2T = 200ns; bar time is 18s; the beginning 2.5%, and the ending 2.5% of the bar time is ignored 2T = 200ns; bar time is 18s; the beginning 2.5%, and the ending 2.5% of the bar time is ignored 5-step staircase f = 5.5MHz f = 15kHz f = 4.43MHz f = 30MHz MIN 48 TYP 64 20 27 15 65 75 MAX UNITS dB MHz MHz V/s ns
MAX9541/MAX9542
9.5 0.1 -1 -3 -47 0.4
MHz
dB
%
Differential Phase Group-Delay Distortion Peak Signal to RMS Noise 2T Pulse Response www..com 2T Bar Response
DP
0.45 9 71 0.2 0.2
deg ns dB K% K%
2T Pulse-to-Bar K Rating Nonlinearity Output Impedance All-Hostile Crosstalk Output-to-Input Crosstalk LOGIC SIGNALS (TV_SEL, VCR_SEL, SHDN) Logic-Low Threshold Logic-High Threshold Logic-Input Current VIL VIH IIN
0.3 0.1 8.07 -82 -78 -68 0.3 x VDD 0.7 x VDD 10
K% % dB dB
V V A
Note 1: All devices are 100% production tested at TA = +25C. 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. _______________________________________________________________________________________ 3
Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
Typical Operating Characteristics (MAX9541)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150 to GND, TA = +25C.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9541 toc01
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9541 toc02
LARGE-SIGNAL GAIN vs. FREQUENCY
VIN = 1VP-P GAIN IS NORMALIZED TO 0dB
MAX9541 toc03 MAX9541 toc09 MAX9541 toc06
10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 100k 1M
3 2 1 0 GAIN (dB) VIN = 50mVP-P GAIN IS NORMALIZED TO 0dB
VIN = 50mVP-P GAIN IS NORMALIZED TO 0dB
10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 GAIN (dB)
GAIN (dB)
-1 -2 -3 -4 -5 -6 -7
10M
100M
100k
1M
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9541 toc04
VIDEO CROSSTALK vs. FREQUENCY
MAX9541 toc05
VIDEO GROUP DELAY DISTORTION vs. FREQUENCY
120 110 100 90 GROUP DELAY (ns) 80 70 60 50 40 30 20 10 0 VIN = 1VP-P GAIN IS NORMALIZED TO 0dB
3 2 1 0 GAIN (dB)
VIN = 1VP-P GAIN IS NORMALIZED TO 0dB
0 -20 -40 GAIN (dB) -60 ALL-HOSTILE -80 -100 -120
VIN = 1VP-P GAIN IS NORMALIZED TO 0dB
-1 -2 -3 -4
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-6 -7 100k 1M 10M 100M FREQUENCY (Hz)
2 ADJACENT CHANNELS 1 ADJACENT CHANNEL 100k 1M 10M 100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
VIDEO PSRR vs. FREQUENCY
MAX9541 toc07
VOLTAGE GAIN vs. TEMPERATURE
MAX9541 toc08
DIFFERENTIAL GAIN
DIFFERENTIAL GAIN (%) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 0 1 2 3 1 2 3 f = 3.58MHz
0 -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80
2.04 2.03 VOLTAGE GAIN (V/V) 2.02 2.01 2.00 1.99 1.98 1.97 1.96 -50 -25 0 25 50 75 100
VDD = 3.3V + 100mVP-P
4
5
DIFFERENTIAL PHASE (deg)
DIFFERENTIAL PHASE
f = 3.58MHz
100k
1M
10M
100M
125
4
5
FREQUENCY (Hz)
TEMPERATURE (C)
4
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Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals
Typical Operating Characteristics (continued) (MAX9541)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150 to GND, TA = +25C.)
MAX9541/MAX9542
DIFFERENTIAL GAIN
DIFFERENTIAL GAIN (%) 0.1 0 -0.1 -0.2 -0.3 -0.4 -0.5 0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 0 1 2 3 1 2 3 f = 4.43MHz
MAX9541 toc10
2T RESPONSE
MAX9541 toc11
12.5T RESPONSE
MAX9541 toc12
IN 200mV/div
IN 200mV/div
4
5
DIFFERENTIAL PHASE (deg)
DIFFERENTIAL PHASE
f = 4.43MHz OUT 400mV/div OUT 400mV/div
4
5
100ns/div
400ns/div
NTC-7 VIDEO TEST SIGNAL
MAX9541 toc13
FIELD SQUARE WAVE
VIDEO SYNC-TIP CLAMP VOLTAGE vs. TEMPERATURE
MAX9541 toc14
0.36 SYNC-TIP CLAMP VOLTAGE (V) IN 500mV/div IN 500mV/div 0.35 0.34 0.33 0.32 0.31 0.30 0.29 0.28 10s/div 2ms/div -50 -25 0 25 50 75 100
OUT 1V/div
OUT 1V/div
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125
TEMPERATURE (C)
VIDEO SYNC-TIP CLAMP CURRENT vs. TEMPERATURE
MAX9541 toc16
SYNC-TIP CLAMP CURRENT vs. INPUT VOLTAGE
MAX9541 toc17
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
QUIESCENT SUPPLY CURRENT (mA) 21.5 21.0 20.5 20.0 19.5 19.0 18.5 18.0 -50 -25 0 25 50 75 100 125
MAX9541 toc18
1.06 SYNC-TIP CLAMP CURRENT (A) 1.04 1.02 1.00 0.98 0.96 0.94 0.92 0.90 -50 -25 0 25 50 75 100
500 SYNC-TIP CLAMP CURRENT (A) 400 300 200 100 0 -100
22.0
125
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
TEMPERATURE (C)
INPUT VOLTAGE (V)
TEMPERATURE (C)
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MAX9541 toc15
0.37
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Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
Typical Operating Characteristics (continued) (MAX9542)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150 to GND, TA = +25C.)
SMALL-SIGNAL GAIN vs. FREQUENCY
MAX9541 toc19
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 -7 VIN = 50mVP-P GAIN IS NORMALIZED TO 0dB
MAX9541 toc20 MAX9541 toc24 MAX9541 toc22
10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 100k 1M
VIN = 50mVP-P GAIN IS NORMALIZED TO 0dB
3
GAIN (dB)
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN vs. FREQUENCY
VIN = 1VP-P GAIN IS NORMALIZED TO 0dB
MAX9541 toc21
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 -7 VIN = 1VP-P GAIN IS NORMALIZED TO 0dB
10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 100k 1M
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GAIN (dB)
10M
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
VIDEO CROSSTALK vs. FREQUENCY
VIN = 1VP-P GAIN IS NORMALIZED TO 0dB
MAX9541 toc23
VIDEO GROUP DELAY DISTORTION vs. FREQUENCY
50 45 40 GROUP DELAY (ns) 35 30 25 20 15 10 5 0 100M 100k 1M 10M 100M VIN = 1VP-P GAIN IS NORMALIZED TO 0dB
0 -20 -40 GAIN (dB) -60 ALL-HOSTILE -80 -100 -120 100k 1M 10M FREQUENCY (Hz) 1 ADJACENT CHANNEL 2 ADJACENT CHANNELS
FREQUENCY (Hz)
6
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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 = 150 to GND, TA = +25C.)
VIDEO PSRR vs. FREQUENCY
MAX9541 toc25
MAX9541/MAX9542
VOLTAGE GAIN vs. TEMPERATURE
2.03 VOLTAGE GAIN (V/V) 2.02 2.01 2.00 1.99 1.98 1.97 1.96
MAX9541 toc26
0 VDD = 3.3V + 100mVP-P -10 -20 PSRR (dB) -30 -40 -50 -60 -70 -80 100k 1M 10M
2.04
100M
-50
-25
0
25
50
75
100
125
FREQUENCY (Hz)
TEMPERATURE (C)
DIFFERENTIAL GAIN AND PHASE
0.10 0.05 0.00 -0.05 -0.10 -0.15 -0.20 0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 0 1 2 3 1 2 3 DIFFERENTIAL GAIN (%) DIFFERENTIAL GAIN (%) f = 3.58MHz 0.10 0.05 0.00 -0.05 -0.10 -0.15 -0.20
MAX9541 toc27
DIFFERENTIAL GAIN AND PHASE
f = 4.43MHz
MAX9541 toc28
4
5 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4
0
1
2
3
4
5
DIFFERENTIAL PHASE (deg)
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4
5
DIFFERENTIAL PHASE (deg)
f = 3.58MHz
f = 4.43MHz
0
1
2
3
4
5
27 RESPONSE
MAX9541 toc29
12.5T RESPONSE
MAX9541 toc30
IN 200mV/div
IN 200mV/div
OUT 400mV/div
OUT 400mV/div
100ns/div
400ns/div
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Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
Typical Operating Characteristics (continued) (MAX9542)
(VDD = 3.3V, VGND = 0, SHDN = VDD, A/B = VDD, RL = 150 to GND, TA = +25C.)
NTC-7 VIDEO TEST SIGNAL
MAX9541 toc31
FIELD SQUARE WAVE
MAX9541 toc32
IN 500mV/div
IN 500mV/div
OUT 1V/div
OUT 1V/div
10s/div
2ms/div
PULSE RESPONSE
INPUT (700mV/div)
MAX9541 toc33
VIDEO SYNC-TIP CLAMP VOLTAGE vs. TEMPERATURE
MAX9541 toc34
VIDEO SYNC-TIP CLAMP CURRENT vs. TEMPERATURE
1.04 1.02 1.00 0.98 0.96 0.94 0.92 0.90
MAX9541 toc35
0.37 0.36 SYNC-TIP CLAMP VOLTAGE (V) 0.35 0.34 0.33 0.32 0.31 0.30 0.29 0.28
1.06 SYNC-TIP CLAMP CURRENT (A)
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100ns/div
OUTPUT (700mV/div)
-50
-25
0
25
50
75
100
125
-50
-25
0
25
50
75
100
125
TEMPERATURE (C)
TEMPERATURE (C)
SYNC-TIP CLAMP CURRENT vs. INPUT VOLTAGE
MAX9541 toc36
QUIESCENT SUPPLY CURRENT vs. TEMPERATURE
QUIESCENT SUPPLY CURRENT (mA) 21.5 21.0 20.5 20.0 19.5 19.0 18.5 18.0
MAX9541 toc37
500 SYNC-TIP CLAMP CURRENT (A) 400 300 200 100 0 -100 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4
22.0
1.6
-50
-25
0
25
50
75
100
125
INPUT VOLTAGE (V)
TEMPERATURE (C)
8
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Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals
Pin Description
PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 NAME IN0A IN1A IN2A IN3A IN0B IN1B IN2B IN3B GND SHDN OUT3 OUT2 OUT1 OUT0 A/B VDD Video Input A Channel 0 Video Input A Channel 1 Video Input A Channel 2 Video Input A Channel 3 Video Input B Channel 0 Video Input B Channel 1 Video Input B Channel 2 Video Input B Channel 3 Ground Shutdown Logic Input. Connect to GND to place the device in shutdown. Connect to VDD for normal operation. Video Output Channel 3 Video Output Channel 2 Video Output Channel 1 Video Output Channel 0 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. Positive Power Supply. Bypass to GND with a 0.1F capacitor. FUNCTION
MAX9541/MAX9542
Detailed Description
The MAX9541 selects between two standard-definition video sources that can each have up to four video sigwww..com nals, 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 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.
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Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
VDD
NAVIGATION COMPUTER 0.1F COMPOSITE SYNC 75 0.1F RED 75 CLAMPREF 0.1F GREEN 75 CLAMPREF 0.1F BLUE 75 CLAMPREF 0.1F COMPOSITE SYNC 75 CLAMPREF 0.1F RED 75 0.1F IN1B IN0B IN3A IN2A IN1A IN0A
MAX9541
A/B OUT0 75 CLAMPREF
DISPLAY PANEL
LPF
2V/V
COMPOSITE SYNC
LPF
2V/V
OUT1 75
RED
LPF
2V/V
OUT2 75
GREEN
CLAMPREF IN2B LPF 2V/V
GREEN www..com 75
OUT3 75
BLUE
CLAMPREF 0.1F BLUE VIDEO SOURCE 75 CLAMPREF IN3B
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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Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
VDD
PC NO. 1 0.1F IN0A RED 75 0.1F GREEN 75 CLAMPREF 0.1F BLUE 75 CLAMPREF 0.1F NOT USED 75 CLAMPREF 0.1F IN0B RED 75 CLAMPREF 0.1F GREEN 75 0.1F IN1B IN3A IN2A IN1A
MAX9542
A/B OUT0 75 CLAMPREF RED
MONITOR
2V/V
2V/V
OUT1 75
GREEN
2V/V
OUT2 75
BLUE
CLAMPREF IN2B 2V/V
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PC NO. 2 75
OUT3 75
NOT USED
CLAMPREF 0.1F NOT USED 75 CLAMPREF IN3B
GND
Figure 2. The MAX9542 Selecting Between Two VGA Sources
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Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
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.
Table 1. A/B Logic
LOGIC STATE Low High MODE Video Input A Video Input B
Input
Table 2. SHDN Logic
LOGIC STATE Low High MODE Off On
Each video source can provide up to four video signals. Every video signal must be AC-coupled to the MAX9541/MAX9542 through 0.1F 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 220k, 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 www..com 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 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 IN0A IN1A IN2A IN3A IN0B IN1B IN2B IN3B INPUT CIRCUIT A/B = LOW Sync-tip clamp Sync-tip clamp Sync-tip clamp Sync-tip clamp Bias Bias Bias Bias INPUT CIRCUIT A/B = HIGH Bias Bias Bias Sync-tip clamp Sync-tip clamp Sync-tip clamp Sync-tip clamp Sync-tip clamp
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Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
Table 4. Quiescent and Average Power Consumption
MEASUREMENT Quiescent power consumption Average power consumption POWER CONSUMPTION (mW) 69 175 No load. 150 to ground on each output. 50% flat field signal on each input. CONDITIONS
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 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. 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.
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 150 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 consumption of the MAX9541/MAX9542.
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 220F or greater to keep the highpass filter, formed by the 150 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 www..com higher. The corner frequency should be well below the frame rate.
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 0.1F capacitor. Place all external components as close as possible to the device.
Pin Configuration
PROCESS: BiCMOS
TOP VIEW
+ IN0A 1 IN1A 2 IN2A 3 IN3A 4 IN0B 5 IN1B 6 IN2B 7 IN3B 8 16 VDD 15 A/B 14 OUT0
Chip Information
MAX9541 MAX9542
13 OUT1 12 OUT2 11 OUT3 10 SHDN 9 GND
QSOP ______________________________________________________________________________________ 13
Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
+3.3V
0.1F
SHDN A/B 0 0.1F IN0A 1 75 0.1F IN1A VIDEO SOURCE A 4 CVBS SIGNALS 75 0 0.1F IN2A 1 75
VDD
MAX9541 MAX9542 BUFFER
LPF* CLAMPREF 2V/V OUT0 75
220F
BUFFER LPF* CLAMPREF 2V/V OUT1 75
220F
0.1F
IN3A
75 0.1F IN0B
0 BUFFER 1 LPF* CLAMPREF 2V/V OUT2 75
220F
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75
0.1F IN1B
VIDEO SOURCE B 4 CVBS SIGNALS
75 0 0.1F IN2B 1 75 CLAMPREF 0.1F IN3B LPF* 2V/V BUFFER OUT3 75 220F
75
GND *LOWPASS FILTER MAX9451 ONLY.
Figure 3. AC-Coupled Outputs
14 ______________________________________________________________________________________
Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals
Typical Application Circuit
+3.3V
MAX9541/MAX9542
0.1F
SHDN A/B 0 0.1F IN0A 1 75 0.1F IN1A VIDEO SOURCE A 4 CVBS SIGNALS 75 0 0.1F IN2A 1 75
VDD
MAX9541 MAX9542
BUFFER LPF* CLAMPREF 2V/V OUT0 75
BUFFER LPF* CLAMPREF 2V/V OUT1 75
0.1F
IN3A
VIDEO OUTPUT 4 CVBS SIGNALS 0 BUFFER 1 LPF* CLAMPREF 2V/V OUT2 75
75 0.1F IN0B
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75
0.1F IN1B
VIDEO SOURCE B 4 CVBS SIGNALS
75 0 0.1F IN2B 1 75 CLAMPREF 0.1F IN3B BUFFER LPF* 2V/V OUT3 75
75
*LOWPASS FILTER MAX9451 ONLY.
GND
______________________________________________________________________________________
15
Quadruple, 2:1, Mux Amplifiers for Standard-Definition and VGA Signals MAX9541/MAX9542
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE 16 QSOP PACKAGE CODE E16-4 DOCUMENT NO. 21-0055
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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.
16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
QSOP.EPS

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