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19-4453; Rev 0; 2/09
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps
General Description
The MAX9657 is a small, low-power, quad video amplifier with input sync-tip clamps. It features a bandwidth of 15MHz, 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. The MAX9658 is a quad video amplifier with integrated lowpass filters and input sync-tip clamps. The lowpass filters typically have 1dB passband flatness out to 9.5MHz and 47dB attenuation at 27MHz. Specially suited for composite video signals, the MAX9658 is ideal for performing anti-alias filtering at the inputs of a digital video recorder or for performing reconstruction filtering at the outputs of a SCART set-top box. Both devices require that the incoming video signals be AC-coupled to the inputs. The input sync-tip clamps set the internal DC level of the video signals. 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 MAX9657/MAX9658 feature a low-power shutdown mode, in which supply current is reduced to 35A. The MAX9657/MAX9658 operate from a single 2.7V to 3.6V supply, are specified over the -40C to +125C automotive temperature range, and are offered in a small, 16-pin QSOP package. Quad Channel 9.5MHz, 1dB Passband (MAX9658) 47dB Attenuation at 27MHz (MAX9658) Fixed Gain of 2V/V Low Power: 21mA 2.7V to 3.6V Single-Supply Operation
Features
MAX9657/MAX9658
Ordering Information
PART MAX9657AEE+ MAX9658AEE+ PIN-PACKAGE 16 QSOP 16 QSOP STANDARD-DEFINITION VIDEO FILTER No Yes
Note: All devices are specified over the -40C to +125C operating temperature range. +Denotes a lead(Pb)-free/RoHS-compliant package.
Functional Diagram
MAX9657/MAX9658
UNKNOWN BIAS SHDN 300mV IN0 LPF* AV = 2V/V CLAMPREF IN1 OUT1 AV = 2V/V CLAMPREF IN2 OUT2 AV = 2V/V OUT0
Applications
Set-Top Boxes Digital Video Recorders
LPF*
LPF*
Typical Application Circuits and Pin Configuration appear at end of data sheet.
CLAMPREF IN3 OUT3 AV = 2V/V CLAMPREF
LPF*
GND *LOWPASS FILTER IN MAX9658 ONLY.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658
ABSOLUTE MAXIMUM RATINGS
Supply Voltage VDD to GND ..........................................................-0.3V to +4V Input Pins, SHDN .....................................(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 = 0V, V SHDN = 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 Sync-Tip Clamp Level SYMBOL VDD IDD ISHDN VCLP Guaranteed by outputvoltage swing 2.7V VDD 3.6V 3.0V VDD 3.6V No load SHDN = GND 0.23 CONDITIONS Guaranteed by power-supply rejection test MIN 2.7 TYP 3.3 21 35 0.3 MAX 3.6 45 70 0.39 1.05 VP-P 1.2 UNITS V mA A V
Input Voltage Range
Sync Crush Input Clamping Current Maximum Input Source Resistance
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 2 2
2 2
% A
DC Voltage Gain (Note 2)
AV
RL = 150 to GND (Note 2)
2.04 V/V 2.04 +2 0.39 % V
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
VP-P
2
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Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VGND = 0V, V SHDN = VDD, RL = 150 to GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER Output Short-Circuit Current Output Resistance Power-Supply Rejection Ratio Small-Signal Bandwidth Large-Signal Bandwidth Slew Rate Settling Time ROUT SYMBOL CONDITIONS Short to GND (sourcing) Short to VDD (sinking) VOUT = 1.5V, -10mA ILOAD +10mA 2.7V VDD 3.6V f = 100kHz, 100mVP-P VOUT = 100mVP-P (MAX9657 only) VOUT = 2VP-P (MAX9657 only) MAX9657 only Settled to within 0.1% of final value (MAX9657 only) VOUT = 2VP-P, reference frequency is 100kHz 1dB passband flatness (MAX9658 only) Standard-Definition Reconstruction Filter f = 5.5MHz VOUT = 2VP-P, reference frequency is 100kHz (MAX9658 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 48 MIN TYP 140 70 0.2 64 20 27 15 65 75 MAX UNITS mA dB MHz MHz V/s ns
MAX9657/MAX9658
9.5 0.1 -1 -3 -47 0.4
MHz
dB
%
Differential Phase Group-Delay Distortion Peak Signal to RMS Noise 2T Pulse Response 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
0.3 0.1 8.07 -82 -78 -68
K% % dB dB
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3
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VGND = 0V, V SHDN = VDD, RL = 150 to GND, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1)
PARAMETER LOGIC SIGNALS (SHDN) Logic-Low Threshold Logic-High Threshold Logic Input Current VIL VIH IIN 0.7 x VDD 10 0.3 x VDD V V A SYMBOL CONDITIONS MIN TYP MAX UNITS
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.
Typical Operating Characteristics (MAX9657)
(VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150 to GND, TA = +25C.)
SMALL-SIGNAL GAIN vs. FREQUENCY
10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 100k 1M 10M 100M FREQUENCY (Hz) GAIN (dB)
MAX9657 toc01
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9657 toc02
LARGE-SIGNAL GAIN vs. FREQUENCY
10 5 0 -5 -10 GAIN (dB) -15 -20 -25 -30 -35 -40 -45 -50 VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB
MAX9657 toc03 MAX9657 toc06
VIN = 50mVP-P NOTE: GAIN IS NORMALIZED TO 0dB
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 -7 100k 1M 10M VIN = 50mVP-P NOTE: GAIN IS NORMALIZED TO 0dB
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9657 toc04
VIDEO CROSSTALK vs. FREQUENCY
VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB
MAX9657 toc05
VIDEO GROUP DELAY DISTORTION vs. FREQUENCY
50 45 40 GROUP DELAY (ns) 35 30 25 20 15 VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB
3 2 1 0 GAIN (dB)
VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB
0 -20 -40 GAIN (dB) -60
-1 -2 -3 -4 -5 -6 -7 100k 1M 10M 100M FREQUENCY (Hz)
ALL-HOSTILE -80 -100 -120 100k 1M 10M 100M FREQUENCY (Hz) 1 ADJACENT CHANNEL 2 ADJACENT CHANNELS
10 5 0 100k 1M 10M 100M FREQUENCY (Hz)
4
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Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps
Typical Operating Characteristics (MAX9657) (continued)
(VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150 to GND, TA = +25C.)
VIDEO PSRR vs. FREQUENCY
MAX9657 toc07
MAX9657/MAX9658
VOLTAGE GAIN vs. TEMPERATURE
MAX9657 toc08
DIFFERENTIAL GAIN AND PHASE
DIFFERENTIAL GAIN (%) 0.10 0.05 0 -0.05 -0.10 -0.15 -0.20 0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 0 1 2 3 1 2 3 f = 3.58MHz
MAX9657 toc09
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)
f = 3.58MHz
100k
1M
10M
100M
125
4
5
FREQUENCY (Hz)
TEMPERATURE (C)
DIFFERENTIAL GAIN AND PHASE
DIFFERENTIAL GAIN (%) 0.10 0.05 0 -0.05 -0.10 -0.15 -0.25 0 0.8 0.6 0.4 0.2 0 -0.2 -0.4 0 1 2 3 1 2 3 f = 4.43MHz
MAX9657 toc10
2T RESPONSE
12.5T RESPONSE
MAX9657 toc11
MAX9657 toc12
IN 200mV/div 4 5
IN 200mV/div
DIFFERENTIAL PHASE (deg)
f = 4.43MHz OUT 400mV/div
OUT 400mV/div
4
5
100ns/div
400ns/div
NTC-7 VIDEO TEST SIGNAL
MAX9657 toc13
FIELD SQUARE WAVE
PULSE RESPONSE
MAX9657 toc14
IN 500mV/div
IN 500mV/div
OUT 1V/div
OUT 1V/div
10s/div
2ms/div
OUTPUT (700mV/div)
INPUT (700mV/div)
TIME (100ns/div)
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MAX9657 toc15
5
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658
Typical Operating Characteristics (MAX9657) (continued)
(VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150 to GND, TA = +25C.)
VIDEO SYNC-TIP CLAMP VOLTAGE vs. TEMPERATURE
MAX9657 toc16
VIDEO SYNC-TIP CLAMP CURRENT vs. TEMPERATURE
MAX9657 toc17
SYNC-TIP CLAMP CURRENT vs. INPUT VOLTAGE
MAX9657 toc18
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 -50 -25 0 25 50 75 100
1.06 SYNC-TIP CLAMP CURRENT (A) 1.04 1.02 1.00 0.98 0.96 0.94 0.92 0.90
500 SYNC-TIP CLAMP CURRENT (A) 400 300 200 100 0 -100
125
-50
-25
0
25
50
75
100
125
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
TEMPERATURE (C)
TEMPERATURE (C)
INPUT VOLTAGE (V)
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 TEMPERATURE (C)
MAX9657 toc19
22.0
6
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Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps
Typical Operating Characteristics (MAX9658) (continued)
(VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150 to GND, TA = +25C.)
SMALL-SIGNAL GAIN vs. FREQUENCY
10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 100k 1M 10M 100M FREQUENCY (Hz)
MAX9657 toc20
MAX9657/MAX9658
SMALL-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9657 toc21
LARGE-SIGNAL GAIN vs. FREQUENCY
10 5 0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 GAIN (dB) VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB
MAX9657 toc22 MAX9657 toc28 MAX9657 toc25
VIN = 50mVP-P NOTE: GAIN IS NORMALIZED TO 0dB
3 2 1 0 GAIN (dB) -1 -2 -3 -4 -5 -6 -7 100k 1M 10M VIN = 50mVP-P NOTE: GAIN IS NORMALIZED TO 0dB
GAIN (dB)
100M
100k
1M
10M
100M
FREQUENCY (Hz)
FREQUENCY (Hz)
LARGE-SIGNAL GAIN FLATNESS vs. FREQUENCY
MAX9657 toc23
VIDEO CROSSTALK vs. FREQUENCY
VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB
MAX9657 toc24
VIDEO GROUP DELAY DISTORTION vs. FREQUENCY
120 110 100 90 GROUP DELAY (ns) 80 70 60 50 40 30 20 10 0 100k 1M 10M 100M FREQUENCY (Hz) VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB
3 2 1 0 GAIN (dB)
VIN = 1VP-P NOTE: GAIN IS NORMALIZED TO 0dB
0 -20 -40 GAIN (dB) -60
-1 -2 -3 -4 -5 -6 -7 100k 1M 10M 100M FREQUENCY (Hz)
ALL-HOSTILE -80 -100 -120 100k 1M 10M 100M FREQUENCY (Hz) 1 ADJACENT CHANNEL 2 ADJACENT CHANNELS
VIDEO PSRR vs. FREQUENCY
MAX9657 toc26
VOLTAGE GAIN vs. TEMPERATURE
MAX9657 toc27
DIFFERENTIAL GAIN AND PHASE
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)
f = 3.58MHz
100k
1M
10M
100M
125
4
5
FREQUENCY (Hz)
TEMPERATURE (C)
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7
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658
Typical Operating Characteristics (MAX9658) (continued)
(VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150 to GND, TA = +25C.)
DIFFERENTIAL GAIN AND PHASE
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
MAX9657 toc29
2T RESPONSE
MAX9657 toc30
IN 200mV/div 4 5
DIFFERENTIAL PHASE (deg)
f = 4.43MHz OUT 400mV/div
4
5
100ns/div
12.5T RESPONSE
MAX9657 toc31
NTC-7 VIDEO TEST SIGNAL
MAX9657 toc32
IN 200mV/div
IN 500mV/div
OUT 400mV/div
OUT 1V/div
400ns/div
10s/div
FIELD SQUARE WAVE
VIDEO SYNC-TIP CLAMP VOLTAGE vs. TEMPERATURE
MAX9657 toc33
0.36 SYNC-TIP CLAMP VOLTAGE (V) 0.35 0.34 0.33 0.32 0.31 0.30 0.29 0.28 2ms/div -50 -25 0 25 50 75 100 IN 500mV/div
OUT 1V/div
125
TEMPERATURE (C)
8
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MAX9657 toc34
0.37
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps
Typical Operating Characteristics (MAX9658) (continued)
(VDD = 3.3V, VGND = 0, V SHDN = VDD, RL = 150 to GND, TA = +25C.)
VIDEO SYNC-TIP CLAMP CURRENT vs. TEMPERATURE
MAX9657 toc35
MAX9657/MAX9658
SYNC-TIP CLAMP CURRENT vs. INPUT VOLTAGE
MAX9657 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 -50 -25 0 25 50 75 100 125
MAX9657 toc37
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)
Pin Description
PIN 1 2 3 4 5-8, 15 9 10 11 12 13 14 16 NAME IN0 IN1 IN2 IN3 N.C. GND SHDN OUT3 OUT2 OUT1 OUT0 VDD Video Input Channel 0 Video Input Channel 1 Video Input Channel 2 Video Input Channel 3 No Connection. Not internally connected. Ground Active-Low Shutdown Logic Input. Connect to GND to place 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 Positive Power Supply. Bypass to GND with a 0.1F capacitor. FUNCTION
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9
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658
Detailed Description
The MAX9657 consists of input sync-tip clamps and gain of 2V/V output amplifiers capable of driving standard 150 loads to ground. It can be used to buffer video signals, for example, before a crosspoint matrix. The MAX9658 filters and amplifies video signals. It is very similar to the MAX9657 except that it also has integrated lowpass filters. This device can be used to provide the anti-alias filtering before the video decoders of a digital video recorder, or it can be used to do the reconstruction filtering after a video DAC that references output signals to the positive supply. 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.
Shutdown
The devices draw approximately 35A of supply current when SHDN is low. In shutdown mode, the amplifier outputs become high impedance.
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 1. 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 higher. The corner frequency should be well below the frame rate.
Input
The MAX9657/MAX9658 feature sync-tip clamps at the input that accept video signals with sync pulses. Composite video with blanking and sync (CVBS) is an example of a video signal with sync pulses. The synctip voltage is internally set to 300mV. In shutdown mode, the inputs to the MAX9657/ MAX9658 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 in shutdown mode are biased at VDD/3, which is sufficiently above ground such 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.
Power Consumption
The quiescent power consumption and average power consumption of the MAX9657/MAX9658 are very low because of the 3.3V operation and low-power circuit design. Quiescent power consumption is defined when the MAX9657/MAX9658 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 MAX9657/MAX9658 drive a 150 load to ground with a 50% flat field, which serves as a proxy for a real video signal. Table 1 shows the quiescent and average power consumption of the MAX9657/MAX9658.
Video Filter (MAX9658 Only)
The MAX9658 filters feature 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.
Power-Supply Bypassing and Ground
The MAX9657/MAX9658 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.
Outputs
The video output amplifiers can both source and sink load current, allowing output loads to be DC- or ACcoupled. 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.
10 ______________________________________________________________________________________
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658
VDD GRAPHICS PROCESSING UNIT OR MPEG DECODER DAC LUMA 75 CLAMPREF CHROMA 75 CLAMPREF CVBS 75 CLAMPREF 0.1F IN3 OUT3 AV = 2V/V CLAMPREF 75 0.1F IN2 OUT2 AV = 2V/V 75 0.1F IN1 OUT1 AV = 2V/V 75 0.1F IN0
+3.3V 0.1F
MAX9657/ MAX9658
GND
LPF* AV = 2V/V
OUT0
75
220F Y
220F C
DAC
LPF*
220F CVBS1
DAC
LPF*
220F CVBS2
LPF*
*LOWPASS FILTER IN MAX9658 ONLY.
Figure 1. AC-Coupled Outputs
Table 1. Quiescent and Average Power Consumption for MAX9657/MAX9658
MEASUREMENT Quiescent power consumption Average power consumption POWER CONSUMPTION (mW) 69 200 No load. 150 to ground on each output. 50% flat field signal on each input. CONDITIONS
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11
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658
Typical Application Circuits
+3.3V
0.1F VDD
MAX9657
SHDN 0.1F 75 0.1F
IN0 AV = 2V/V CLAMPREF
OUT0
75
75
0.1F
IN1 AV = 2V/V CLAMPREF
OUT1
75
0.1F
75 CVBS INPUTS 0.1F IN2
75 16x16 CROSSPOINT OUT2 75 0.1F
75 CLAMPREF 0.1F IN3
AV = 2V/V
75
OUT3 AV = 2V/V CLAMPREF
75
0.1F
75
75
GND
NOTE: FOUR MAX9657s ARE REQUIRED BEFORE THE 16x16 CROSSPOINT.
12
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Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps
Typical Application Circuits (continued)
+3.3V
MAX9657/MAX9658
0.1F VDD
MAX9658
SHDN 0.1F 75 0.1F
IN0
LPF AV = 2V/V CLAMPREF
OUT0
75
75
0.1F
IN1
LPF AV = 2V/V CLAMPREF
OUT1
75
0.1F
75 CVBS INPUTS 0.1F IN2
75
QUADRUPLE VIDEO DECODER 0.1F
LPF AV = 2V/V CLAMPREF
OUT2
75
75
75
0.1F
IN3
LPF AV = 2V/V CLAMPREF
OUT3
75
0.1F
75
75
GND
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13
Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps MAX9657/MAX9658
Pin Configuration
PROCESS: BiCMOS
IN0 1 IN1 2 IN2 3 IN3 4 N.C. 5 N.C. 6 N.C. 7 N.C. 8
Chip Information
+
16 VDD 15 N.C.
MAX9657 MAX9658
14 OUT0 13 OUT1 12 OUT2 11 OUT3 10 SHDN 9 GND
QSOP
14
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Quad Video (Filter) Amplifiers with Input Sync-Tip Clamps
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
MAX9657/MAX9658
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.
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