General Description
The MAX7453 is a low-cost, triple-channel video recon-
struction filter for S-video and CVBS video-signal appli-
cations. This device is ideal for anti-aliasing and DAC
smoothing video applications such as set-top boxes,
DVD players, hard-disk recorders (HDRs), and personal
video recorders. This filter operates from a single +5V
supply. It is optimized for NTSC, PAL, and standard-defi-
nition TV (SDTV) video systems.
Each channel consists of a lowpass filter and an output
buffer capable of driving one (YOUT, COUT) or two
(CVOUT) standard 150Ωvideo loads. The output buffers
can drive either an AC or a DC load such that the blank-
ing level voltage after the backmatch resistor is less than
1V. The Y and C video inputs are summed to produce
the composite video output. The MAX7453 has a maxi-
mally flat frequency response.
The MAX7453 is available in an 8-pin SO package and is
fully specified over the commercial (0°C to +70°C) tem-
perature range.
Applications
Set-Top Boxes/HDRs/DVDs
Security Cameras/Digital Cameras
Game Consoles
Digital VCRs
Every Composite, S-Video Output for NTSC,
PAL, and SDTV
Features
♦Triple-Channel Filter and Buffer for CVBS and
Y/C (S-Video) Video Signals
♦Filter Response Ideal for NTSC, PAL, and
Interlaced SDTV Signals
♦42dB (typ) Stopband Attenuation at 27MHz
♦-0.3dB (typ) Passband Response
♦<1V Blanking Level Allows DC-Coupled Output
♦CVOUT Drives Two 150ΩVideo Loads
♦YOUT and COUT Drive One 150ΩVideo Load
♦+5V Single-Supply Voltage
♦8-Pin SO Package
MAX7453
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
________________________________________________________________ Maxim Integrated Products 1
19-3269; Rev 0; 6/05
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
EVALUATION KIT
AVAILABLE
D/A CIN LOWPASS
FILTER
LOWPASS
FILTER
YIN
D/A
Σ
COUT
CVOUT
YOUT
*
GND
VCC
*
*
*
ENCODER
MAX7453
+6dB
+6dB
+6dB
Functional Diagram
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX7453CSA 0°C to +70°C 8 SO
CVOUT
COUTCIN
1
2
8
7
YOUT
VCC
N.C.
GND
YIN
SO
TOP VIEW
3
4
6
5
MAX7453
Pin Configuration
MAX7453
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
2 _______________________________________________________________________________________
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.
VCC to GND ...........................................................................+6V
All Other Pins to GND.................................-0.3V to (VCC + 0.3V)
Maximum Current into Any Pin Except VCC and GND .....±50mA
Continuous Power Dissipation (TA= +70°C)
8-Pin SO ....................................................................522.8mW
Operating Temperature Range...............................0°C to +70°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%, CL= 0 to 20pF, all loads to GND for DC-couple, all loads to VCC / 2 for AC-couple, CYIN = CCIN = 0.1µF,
RYOUT = 150Ω, RCOUT = 150Ω, RCVOUT = 75Ω, TA= TMIN to TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Passband Response f = 100kHz to 4.2MHz, relative to 100kHz -0.6 -0.27 0 dB
Stopband Attenuation ASB f = 27MHz 39 42 dB
Chroma/Luma Gain f = 3.58MHz, reference to CVOUT at 336kHz 96 98 100 %
Differential Gain dG 5-step modulated staircase 0.15 0.5 %
Differential Phase dθ5-step modulated staircase 0.15 0.5 Degrees
Signal-to-Noise Ratio SNR Peak signal (2VP-P) to RMS noise,
f = 100Hz to 50MHz 67 73 dB
Line-Time Distortion HDIST 18µs, 100IRE bar 0.3 %
Field-Time Distortion VDIST 130 lines, 18µs, 100IRE bar 0.5 %
Clamp Settling Time To ±1% 300 Lines
YOUT 0.60 0.8 0.95
CVOUT 0.60 0.8 0.95Output DC Clamp Level
COUT 1.44 1.6 1.95
V
Low-Frequency Gain Accuracy AVf = 100kHz, relative to 6dB -3.0 +2.0 %
Group-Delay Deviation ΔtgDeviation from 100kHz to 4.1MHz 8 16 ns
Group-Delay Matching tg(MATCH) Low-frequency channel-to-channel matching,
f = 100kHz for YOUT and COUT 2ns
Channel-to-Channel Crosstalk XTALK f = 100kHz to 3.58MHz 61 dB
Input Leakage Current IIN 10 µA
YINP-P 1.2
Input Dynamic Swing CINP-P 0.9 VP-P
SUPPLY
Supply Voltage Range VCC 4.75 5.25 V
Supply Current ICC VCC = +5.25V, no load 65 85 mA
Power-Supply Rejection Ratio PSRR VIN = 100mVP-P, f = 0 to 3.5MHz 33 dB
MAX7453
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
_______________________________________________________________________________________ 3
AMPLITUDE vs. FREQUENCY
MAX7453 toc01
FREQUENCY (MHz)
AMPLITUDE (dB)
10
-70
-60
-50
-40
-30
-20
-10
0
10
-80
1 100
NORMALIZED TO 0dB
PASSBAND AMPLITUDE vs. FREQUENCY
MAX7453 toc02
FREQUENCY (MHz)
AMPLITUDE (dB)
1
-2.5
-2.0
-1.5
-1.0
-0.5
0
0.5
1.0
-3.0
0.1 10
NORMALIZED TO 0dB
PHASE RESPONSE vs. FREQUENCY
MAX7453 toc03
FREQUENCY (MHz)
PHASE (DEGREES)
1
-240
-200
-160
-120
-80
-40
0
40
-280
0.1 10
GROUP DELAY vs. FREQUENCY
MAX7453 toc04
FREQUENCY (MHz)
GROUP DELAY (ns)
1
50
55
60
65
70
75
80
85
90
40
45
0.1 10
2T RESPONSE (1IRE = 7.4mV)
MAX7453 toc05
100ns/div
YIN
200mV/div
YOUT
200mV/div
MEASURE AT
TERMINATION
MODULATED 12.5T RESPONSE
(1IRE = 7.14mV)
MAX7453 toc06
400ns/div
YIN
500mV/div
YOUT
500mV/div
MEASURE AT TERMINATION
SUPPLY CURRENT vs. TEMPERATURE
MAX7453 toc07
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
603510-15
52
54
56
58
60
62
64
66
68
70
50
-40 85
DIFFERENTIAL GAIN
DIFFERENTIAL PHASE
MAX7453 toc08
DIFFERENTIAL GAIN (%)
-0.3
-0.2
0.2
-0.1
0.1
0
0.3
1st 2nd 3rd 4th 5th 6th
DIFFERENTIAL PHASE (DEGREES)
-0.3
-0.2
0.2
-0.1
0.1
0
0.3
1st 2nd 3rd 4th 5th 6th
MULTIBURST RESPONSE
MAX7453 toc09
10μs/div
YIN
500mV/div
YOUT
500mV/div
MEASURED AT TERMINATION
Typical Operating Characteristics
(VCC = +5V, TA= +25°C, unless otherwise noted.)
Detailed Description
The primary function of the MAX7453 is to filter and
buffer the encoder DAC outputs that contain digital
video information in applications such as set-top boxes,
HDRs, DVD players, and digital VCRs. This device
reconstructs and cleans up analog video signals. The
MAX7453 consists of a lowpass filter and a +6dB-gain
output video buffer. The luma (YIN) and chroma (CIN)
video inputs are summed internally to provide the com-
posite (CVOUT) video output.
These devices operate from a single +5V supply. The
filters have a nominal cutoff frequency optimized for
NTSC, PAL, and SDTV.
Filter
Filter Response
The reconstruction filter consists of two 2nd-order
Sallen-Key stages. The Butterworth-type response fea-
tures a maximally flat passband for NTSC and PAL
bandwidths. The stopband offers 42dB (typ) of attenua-
tion at sampling frequencies of 27MHz and above (see
the Typical Operating Characteristics).
Output Buffer
The YOUT and COUT buffers have a fixed +6dB gain
capable of driving one standard 150Ωvideo load with a
2VP-P signal. The CVOUT buffer has a fixed +6dB gain,
capable of driving two 150Ωvideo loads. The MAX7453
can drive an AC load or drive the video load directly
without using the large output capacitor. The output
buffer of all the channels drives a DC load with an out-
put blanking level of less than 1V.
Output Clamp Level
When sync pulses in the luma signal (Y) are detected,
the DC restore loop is activated. The function of the
loop is to set the sync tip of the video signal to the
desired DC level of 0.8V for YOUT and COUT, and to
set the average DC voltage of COUT at 1.6V.
Applications Information
Input Considerations
Use a 0.1µF ceramic capacitor to AC-couple the input
to the MAX7453. This input capacitor stores a DC level
such that the outputs are clamped to the appropriate
DC voltage level.
Output Considerations
The outputs of the MAX7453 are typically connected to
a 75Ωseries back-match resistor followed by the video
cable. Because of the inherent divide-by-two of this con-
figuration, the blanking level of the video cable is always
less than 1V, which complies with industry-standard
video requirements. The video buffer can also drive an
AC-coupled video load. Good video performance is
achieved with an output capacitor as low as 220µF.
Power-Supply Bypassing and Layout
The MAX7453 operates from a single +5V supply.
Bypass VCC to GND with a 0.1µF capacitor. Place all
external components as close to the device as possible.
The maximum power dissipation listed in the Absolute
Maximum Ratings section assumes that the PC board is
a multilayer board with ground and power planes.
Chip Information
TRANSISTOR COUNT: 4100
PROCESS: BiCMOS
PIN NAME FUNCTION
1 YIN Luma (Y) Input
2 N.C. No Connection. No internal connection.
3 GND Ground
4 CIN Chroma (C) Input
5 COUT Chroma (C) Output
6 CVOUT Composite Video Output
7V
CC 5V Power Supply
8 YOUT Luma (Y) Output
Pin Description
MAX7453
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
4 _______________________________________________________________________________________
MAX7453
Triple-Channel Video Reconstruction Filter and
Buffer for Composite and Y/C Outputs
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 _____________________ 5
© 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
SOICN .EPS
PACKAGE OUTLINE, .150" SOIC
1
1
21-0041 B
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
MAX
0.010
0.069
0.019
0.157
0.010
INCHES
0.150
0.007
E
C
DIM
0.014
0.004
B
A1
MIN
0.053A
0.19
3.80 4.00
0.25
MILLIMETERS
0.10
0.35
1.35
MIN
0.49
0.25
MAX
1.75
0.050
0.016L0.40 1.27
0.3940.386D
D
MINDIM
D
INCHES
MAX
9.80 10.00
MILLIMETERS
MIN MAX
16 AC
0.337 0.344 AB8.758.55 14
0.189 0.197 AA5.004.80 8
N MS012
N
SIDE VIEW
H 0.2440.228 5.80 6.20
e 0.050 BSC 1.27 BSC
C
HE
eBA1
A
D
0∞-8∞
L
1
VARIATIONS:
