General Description
The MAX9657 is a small, low-power, quad video ampli-
fier with input sync-tip clamps. It features a bandwidth
of 15MHz, making it suitable for not only standard-defi-
nition 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 suit-
ed 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 75Ωload, which is the equivalent of
two video loads, or AC-coupled to a 150Ωload.
Both the MAX9657/MAX9658 feature a low-power shut-
down mode, in which supply current is reduced to
35µA.
The MAX9657/MAX9658 operate from a single 2.7V to
3.6V supply, are specified over the -40°C to +125°C
automotive temperature range, and are offered in a
small, 16-pin QSOP package.
Applications
Set-Top Boxes
Digital Video Recorders
Features
♦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
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
________________________________________________________________
Maxim Integrated Products
1
19-4453; Rev 0; 2/09
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.
Typical Application Circuits and Pin Configuration appear
at end of data sheet.
UNKNOWN
BIAS 300mV
AV = 2V/V
LPF*
CLAMPREF
OUT0IN0
AV = 2V/V
LPF*
CLAMPREF
OUT1IN1
AV = 2V/V
LPF*
CLAMPREF
OUT2IN2
*LOWPASS FILTER IN MAX9658 ONLY.
AV = 2V/V
LPF*
CLAMPREF
OUT3IN3
SHDN
MAX9657/MAX9658
GND
Functional Diagram
Ordering Information
PART PIN-PACKAGE STANDARD-DEFINITION
VIDEO FILTER
MAX9657AEE+ 16 QSOP No
MAX9658AEE+ 16 QSOP Yes
Note: All devices are specified over the -40°C to +125°C oper-
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VDD = 3.3V, VGND = 0V, VSHDN = VDD, RL= 150Ωto GND, TA= TMIN to TMAX, unless otherwise noted. Typical values are at
TA= +25°C.) (Note 1)
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.
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= +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
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 = GND 35 70 µA
Sync-Tip Clamp Level VCLP 0.23 0.3 0.39 V
2.7V ≤ VDD ≤
3.6V 1.05
Input Voltage Range Guaranteed by output-
voltage swing 3.0V ≤ VDD ≤
3.6V 1.2
VP-P
Sync Crush
Sync-tip clamp; percentage reduction in
sync pulse (0.3VP-P); guaranteed by input
clamping current measurement
2%
Input Clamping Current 12µA
Maximum Input Source
Resistance 300 Ω
VDD = 2.7V,
0V ≤ VIN ≤ 1.05V 1.96 2 2.04
DC Voltage Gain (Note 2) AVRL = 150Ω to GND
(Note 2) VDD = 3V,
0V ≤ VIN ≤ 1.2V 1.96 2 2.04
V/V
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
Measured at output, VDD = 2.7V, VIN =
VCLP to (VCLP +1.05V), RL = 150Ω to -0.2V 2.1
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, VIN =
VCLP to (VCLP +1.2V), RL = 150Ω to VDD/2 2.4
Output-Voltage Swing
Measured at output, VDD = 3.135V, VIN =
VCLP to (VCLP +1.05V), RL = 75Ω to -0.2V 2.1
VP-P
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Short to GND (sourcing) 140
Output Short-Circuit Current Short to VDD (sinking) 70 mA
Output Resistance ROUT VOUT = 1.5V, -10mA ≤ ILOAD ≤ +10mA 0.2 Ω
2.7V ≤ VDD ≤ 3.6V 48 64
Power-Supply Rejection Ratio f = 100kHz, 100mVP-P 20 dB
Small-Signal Bandwidth VOUT = 100mVP-P (MAX9657 only) 27 MHz
Large-Signal Bandwidth VOUT = 2VP-P (MAX9657 only) 15 MHz
Slew Rate MAX9657 only 65 V/µs
Settling Time Settled to within 0.1% of final value
(MAX9657 only) 75 ns
VOUT = 2VP-P, reference frequency is
100kHz ±1dB passband flatness (MAX9658
only)
9.5 MHz
f = 5.5MHz 0.1
f = 9.5MHz -1
f = 10MHz -3
Standard-Definition
Reconstruction Filter VOUT = 2VP-P, reference
frequency is 100kHz
(MAX9658 only)
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 9ns
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 18µs; 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 18µs; 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
All-Hostile Crosstalk f = 4.43MHz -78 dB
Output-to-Input Crosstalk f = 30MHz -68 dB
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VGND = 0V, VSHDN = VDD, RL= 150Ωto GND, TA= TMIN to TMAX, unless otherwise noted. Typical values are at
TA= +25°C.) (Note 1)
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9657 toc01
FREQUENCY (Hz)
GAIN (dB)
10M1M
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
-50
100k 100M
VIN = 50mVP-P
NOTE: GAIN IS NORMALIZED TO 0dB
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9657 toc02
FREQUENCY (Hz)
GAIN (dB)
10M1M
-6
-5
-4
-3
-2
-1
0
1
2
3
-7
100k 100M
VIN = 50mVP-P
NOTE: GAIN IS NORMALIZED TO 0dB
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX9657 toc03
FREQUENCY (Hz)
GAIN (dB)
10M1M
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
-50
100k 100M
VIN = 1VP-P
NOTE: GAIN IS NORMALIZED TO 0dB
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9657 toc04
FREQUENCY (Hz)
GAIN (dB)
10M1M
-6
-5
-4
-3
-2
-1
0
1
2
3
-7
100k 100M
VIN = 1VP-P
NOTE: GAIN IS NORMALIZED TO 0dB
VIDEO CROSSTALK
vs. FREQUENCY
MAX9657 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
NOTE: GAIN IS NORMALIZED TO 0dB
VIDEO GROUP DELAY DISTORTION
vs. FREQUENCY
MAX9657 toc06
FREQUENCY (Hz)
GROUP DELAY (ns)
10M1M
5
10
15
20
25
30
35
40
45
50
0
100k 100M
VIN = 1VP-P
NOTE: GAIN IS NORMALIZED TO 0dB
Typical Operating Characteristics (MAX9657)
(VDD = 3.3V, VGND = 0, VSHDN = VDD, RL= 150Ωto GND, TA= +25°C.)
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
4 _______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(VDD = 3.3V, VGND = 0V, VSHDN = VDD, RL= 150Ωto GND, TA= TMIN to TMAX, unless otherwise noted. Typical values are at
TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
LOGIC SIGNALS (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
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.
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
_______________________________________________________________________________________ 5
VIDEO PSRR
vs. FREQUENCY
MAX9657 toc07
FREQUENCY (Hz)
PSRR (dB)
10M1M
-70
-60
-50
-40
-30
-20
-10
0
-80
100k 100M
VDD = 3.3V + 100mVP-P
VOLTAGE GAIN
vs. TEMPERATURE
MAX9657 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 AND PHASE
MAX9657 toc09
DIFFERENTIAL PHASE (deg)
103245
0.6
0.8
0.4
0.2
0
-0.2
-0.4
DIFFERENTIAL GAIN (%)
0.05
0.10
0
-0.05
-0.10
-0.15
-0.20
103245
f = 3.58MHz
f = 3.58MHz
Typical Operating Characteristics (MAX9657) (continued)
(VDD = 3.3V, VGND = 0, VSHDN = VDD, RL= 150Ωto GND, TA= +25°C.)
DIFFERENTIAL GAIN AND PHASE
MAX9657 toc10
DIFFERENTIAL PHASE (deg)
103245
0.6
0.8
0.4
0.2
0
-0.2
-0.4
DIFFERENTIAL GAIN (%)
0.05
0.10
0
-0.05
-0.10
-0.15
-0.25
103245
f = 4.43MHz
f = 4.43MHz
100ns/div
2T RESPONSE
IN
200mV/div
MAX9657 toc11
OUT
400mV/div
400ns/div
12.5T RESPONSE
IN
200mV/div
MAX9657 toc12
OUT
400mV/div
10μs/div
NTC-7 VIDEO TEST SIGNAL
IN
500mV/div
MAX9657 toc13
OUT
1V/div
2ms/div
FIELD SQUARE WAVE
IN
500mV/div
MAX9657 toc14
OUT
1V/div
PULSE RESPONSE
MAX9657 toc15
TIME (100ns/div)
INPUT (700mV/div)OUTPUT (700mV/div)
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
6 _______________________________________________________________________________________
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX9657 toc19
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
VIDEO SYNC-TIP CLAMP VOLTAGE
vs. TEMPERATURE
MAX9657 toc16
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
MAX9657 toc17
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
SYNC-TIP CLAMP CURRENT
vs. INPUT VOLTAGE
MAX9657 toc18
INPUT VOLTAGE (V)
SYNC-TIP CLAMP CURRENT (μA)
0.40.2
0
100
200
300
400
500
-100
0 1.00.80.6 1.41.2 1.6
Typical Operating Characteristics (MAX9657) (continued)
(VDD = 3.3V, VGND = 0, VSHDN = VDD, RL= 150Ωto GND, TA= +25°C.)
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
_______________________________________________________________________________________ 7
SMALL-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9657 toc21
FREQUENCY (Hz)
GAIN (dB)
10M1M
-6
-5
-4
-3
-2
-1
0
1
2
3
-7
100k 100M
VIN = 50mVP-P
NOTE: GAIN IS NORMALIZED TO 0dB
SMALL-SIGNAL GAIN
vs. FREQUENCY
MAX9657 toc20
FREQUENCY (Hz)
GAIN (dB)
10M1M
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
-50
100k 100M
VIN = 50mVP-P
NOTE: GAIN IS NORMALIZED TO 0dB
LARGE-SIGNAL GAIN
vs. FREQUENCY
MAX9657 toc22
FREQUENCY (Hz)
GAIN (dB)
10M1M
-45
-40
-35
-30
-25
-20
-15
-10
-5
0
5
10
-50
100k 100M
VIN = 1VP-P
NOTE: GAIN IS NORMALIZED TO 0dB
LARGE-SIGNAL GAIN FLATNESS
vs. FREQUENCY
MAX9657 toc23
FREQUENCY (Hz)
GAIN (dB)
10M1M
-6
-5
-4
-3
-2
-1
0
1
2
3
-7
100k 100M
VIN = 1VP-P
NOTE: GAIN IS NORMALIZED TO 0dB
VIDEO CROSSTALK
vs. FREQUENCY
MAX9657 toc24
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
NOTE: GAIN IS NORMALIZED TO 0dB
VIDEO GROUP DELAY DISTORTION
vs. FREQUENCY
MAX9657 toc25
FREQUENCY (Hz)
GROUP DELAY (ns)
10M1M
20
30
40
50
60
80
10
70
90
100
110
120
0
100k 100M
VIN = 1VP-P
NOTE: GAIN IS NORMALIZED TO 0dB
VIDEO PSRR
vs. FREQUENCY
MAX9657 toc26
FREQUENCY (Hz)
PSRR (dB)
10M1M
-70
-60
-50
-40
-30
-20
-10
0
-80
100k 100M
VDD = 3.3V + 100mVP-P
VOLTAGE GAIN
vs. TEMPERATURE
MAX9657 toc27
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
MAX9657 toc28
DIFFERENTIAL PHASE (deg)
103245
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
103245
f = 3.58MHz
f = 3.58MHz
Typical Operating Characteristics (MAX9658) (continued)
(VDD = 3.3V, VGND = 0, VSHDN = VDD, RL= 150Ωto GND, TA= +25°C.)
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
8 _______________________________________________________________________________________
DIFFERENTIAL GAIN AND PHASE
MAX9657 toc29
DIFFERENTIAL PHASE (deg)
103245
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
103245
f = 4.43MHz
f = 4.43MHz
100ns/div
2T RESPONSE
IN
200mV/div
MAX9657 toc30
OUT
400mV/div
400ns/div
12.5T RESPONSE
IN
200mV/div
MAX9657 toc31
OUT
400mV/div
10μs/div
NTC-7 VIDEO TEST SIGNAL
IN
500mV/div
MAX9657 toc32
OUT
1V/div
2ms/div
FIELD SQUARE WAVE
IN
500mV/div
MAX9657 toc33
OUT
1V/div
VIDEO SYNC-TIP CLAMP VOLTAGE
vs. TEMPERATURE
MAX9657 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
Typical Operating Characteristics (MAX9658) (continued)
(VDD = 3.3V, VGND = 0, VSHDN = VDD, RL= 150Ωto GND, TA= +25°C.)
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
_______________________________________________________________________________________
9
VIDEO SYNC-TIP CLAMP CURRENT
vs. TEMPERATURE
MAX9657 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
SYNC-TIP CLAMP CURRENT
vs. INPUT VOLTAGE
MAX9657 toc36
INPUT VOLTAGE (V)
SYNC-TIP CLAMP CURRENT (μA)
0.40.2
0
100
200
300
400
500
-100
0 1.00.80.6 1.41.2 1.6
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX9657 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
Typical Operating Characteristics (MAX9658) (continued)
(VDD = 3.3V, VGND = 0, VSHDN = VDD, RL= 150Ωto GND, TA= +25°C.)
Pin Description
PIN NAME FUNCTION
1 IN0 Video Input Channel 0
2 IN1 Video Input Channel 1
3 IN2 Video Input Channel 2
4 IN3 Video Input Channel 3
5–8, 15 N.C. No Connection. Not internally connected.
9 GND Ground
10 SHDN Active-Low Shutdown Logic Input. Connect to GND to place 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
16 VDD Positive Power Supply. Bypass to GND with a 0.1µF capacitor.
MAX9657/MAX9658
Detailed Description
The MAX9657 consists of input sync-tip clamps and
gain of 2V/V output amplifiers capable of driving stan-
dard 150Ωloads 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 inte-
grated lowpass filters. This device can be used to pro-
vide 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 refer-
ences output signals to the positive supply.
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 sync-
tip 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 shut-
down 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 220kΩ, which presents negligible loading on the
video current DAC.
Video Filter (MAX9658 Only)
The MAX9658 filters feature ±1dB passband out to
9.5MHz and 47dB attenuation at 27MHz, making the fil-
ter 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 mod-
ern video systems oversample by two times, clocking
the video current DAC at 27MHz.
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-cou-
pled 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 35µA of supply cur-
rent when SHDN is low. In shutdown mode, the amplifi-
er 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 220µF or greater to
keep the highpass filter, formed by the 150Ωequivalent
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.
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 150Ωload 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 con-
sumption of the MAX9657/MAX9658.
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 0.1µF capacitor. Place all
external components as close as possible to the
device.
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
10 ______________________________________________________________________________________
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
______________________________________________________________________________________ 11
AV = 2V/V
LPF*
0.1μF
GRAPHICS PROCESSING
UNIT OR
MPEG DECODER
CLAMPREF
AV = 2V/V
LPF*
CLAMPREF
AV = 2V/V
LPF*
CLAMPREF
AV = 2V/V
LPF*
CLAMPREF
MAX9657/
MAX9658
0.1μF
0.1μF
0.1μF
75Ω220μF
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
OUT0
OUT1
OUT2
OUT3
IN0
IN1
IN2
IN3
220μF
220μF
220μF
*LOWPASS FILTER IN MAX9658 ONLY.
Y
C
CVBS1
CVBS2
GND
VDD
0.1μF
+3.3V
DAC
DAC
DAC
LUMA
CHROMA
CVBS
Figure 1. AC-Coupled Outputs
MEASUREMENT POWER CONSUMPTION
(mW) CONDITIONS
Quiescent power consumption 69 No load.
Average power consumption 200 150Ω to ground on each output. 50% flat field signal on
each input.
Table 1. Quiescent and Average Power Consumption for MAX9657/MAX9658
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
12 ______________________________________________________________________________________
AV = 2V/V
0.1μF
CLAMPREF
AV = 2V/V
CLAMPREF
AV = 2V/V
CLAMPREF
AV = 2V/V
CLAMPREF
MAX9657
GND
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
VDD
+3.3V
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
NOTE: FOUR MAX9657s ARE REQUIRED BEFORE THE 16x16 CROSSPOINT.
OUT0
OUT1
OUT2
OUT3
IN0
IN1
IN2
IN3
SHDN
16x16
CROSSPOINT
CVBS
INPUTS
Typical Application Circuits
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
______________________________________________________________________________________ 13
AV = 2V/V
LPF
0.1μF
CLAMPREF
AV = 2V/V
LPF
CLAMPREF
AV = 2V/V
LPF
CLAMPREF
AV = 2V/V
LPF
CLAMPREF
MAX9658
GND
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
0.1μF
VDD
+3.3V
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
75Ω
OUT0
OUT1
OUT2
OUT3
IN0
IN1
IN2
IN3
SHDN
QUADRUPLE
VIDEO
DECODER
CVBS
INPUTS
Typical Application Circuits (continued)
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
14 ______________________________________________________________________________________
16 VDD
1IN0
15 N.C.2IN1
14 OUT03IN2
13 OUT14IN3
12 OUT25N.C.
11 OUT36N.C.
10 SHDN7N.C.
9 GND8N.C.
MAX9657
MAX9658
QSOP
+
Pin Configuration Chip Information
PROCESS: BiCMOS
MAX9657/MAX9658
Quad Video (Filter) Amplifiers with Input
Sync-Tip Clamps
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________
15
© 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.
PACKAGE TYPE PACKAGE CODE DOCUMENT NO.
16 QSOP E16-4 21-0055
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages.
QSOP.EPS
