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19-3269; Rev 0; 6/05
Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs
General Description
The MAX7453 is a low-cost, triple-channel video reconstruction filter for S-video and CVBS video-signal applications. 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-definition 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 150 video loads. The output buffers can drive either an AC or a DC load such that the blanking 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 maximally flat frequency response. The MAX7453 is available in an 8-pin SO package and is fully specified over the commercial (0C to +70C) temperature range.
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 150 Video Loads YOUT and COUT Drive One 150 Video Load +5V Single-Supply Voltage 8-Pin SO Package
MAX7453
Ordering Information
PART MAX7453CSA TEMP RANGE 0C to +70C PIN-PACKAGE 8 SO
Applications
Set-Top Boxes/HDRs/DVDs Security Cameras/Digital Cameras Game Consoles Digital VCRs Every Composite, S-Video Output for NTSC, PAL, and SDTV
GND 3 CIN 4
Pin Configuration
TOP VIEW
YIN 1 N.C. 2 8 7 YOUT VCC CVOUT COUT
MAX7453
6 5
SO
Functional Diagram
VCC * ENCODER D/A YIN LOWPASS FILTER +6dB YOUT
*
MAX7453
+6dB
CVOUT
*
D/A
CIN
LOWPASS FILTER GND
+6dB
COUT
*
________________________________________________________________ Maxim Integrated Products
1
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs MAX7453
ABSOLUTE MAXIMUM RATINGS
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 = +70C) 8-Pin SO ....................................................................522.8mW Operating Temperature Range...............................0C to +70C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+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
(VCC = +5V 5%, CL = 0 to 20pF, all loads to GND for DC-couple, all loads to VCC / 2 for AC-couple, CYIN = CCIN = 0.1F, RYOUT = 150, RCOUT = 150, RCVOUT = 75, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Passband Response Stopband Attenuation Chroma/Luma Gain Differential Gain Differential Phase Signal-to-Noise Ratio Line-Time Distortion Field-Time Distortion Clamp Settling Time Output DC Clamp Level Low-Frequency Gain Accuracy Group-Delay Deviation Group-Delay Matching Channel-to-Channel Crosstalk Input Leakage Current Input Dynamic Swing SUPPLY Supply Voltage Range Supply Current Power-Supply Rejection Ratio VCC ICC PSRR VCC = +5.25V, no load VIN = 100mVP-P, f = 0 to 3.5MHz 4.75 65 33 5.25 85 V mA dB AV tg tg(MATCH) XTALK IIN YINP-P CINP-P dG d SNR HDIST VDIST ASB SYMBOL f = 27MHz f = 3.58MHz, reference to CVOUT at 336kHz 5-step modulated staircase 5-step modulated staircase Peak signal (2VP-P) to RMS noise, f = 100Hz to 50MHz 18s, 100IRE bar 130 lines, 18s, 100IRE bar To 1% YOUT CVOUT COUT f = 100kHz, relative to 6dB Deviation from 100kHz to 4.1MHz Low-frequency channel-to-channel matching, f = 100kHz for YOUT and COUT f = 100kHz to 3.58MHz 0.60 0.60 1.44 -3.0 8 2 61 10 1.2 0.9 300 0.8 0.8 1.6 0.95 0.95 1.95 +2.0 16 % ns ns dB A VP-P V 67 CONDITIONS f = 100kHz to 4.2MHz, relative to 100kHz MIN -0.6 39 96 TYP -0.27 42 98 0.15 0.15 73 0.3 0.5 100 0.5 0.5 MAX 0 UNITS dB dB % % Degrees dB % % Lines
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs MAX7453
Typical Operating Characteristics
(VCC = +5V, TA = +25C, unless otherwise noted.)
AMPLITUDE vs. FREQUENCY
MAX7453 toc01
PASSBAND AMPLITUDE vs. FREQUENCY
MAX7453 toc02
PHASE RESPONSE vs. FREQUENCY
0 -40 PHASE (DEGREES) -80 -120 -160 -200 -240
MAX7453 toc03
10 0 -10 AMPLITUDE (dB) -20 -30 -40 -50 -60 -70 -80 1 10 FREQUENCY (MHz) NORMALIZED TO 0dB
1.0 0.5 0 AMPLITUDE (dB) -0.5 -1.0 -1.5 -2.0 -2.5 NORMALIZED TO 0dB -3.0
40
-280 0.1 1 FREQUENCY (MHz) 10 0.1 1 FREQUENCY (MHz) 10
100
GROUP DELAY vs. FREQUENCY
MAX7453 toc04
2T RESPONSE (1IRE = 7.4mV)
MAX7453 toc05
MODULATED 12.5T RESPONSE (1IRE = 7.14mV)
MAX7453 toc06
90 85 80 GROUP DELAY (ns) 75 70 65 60 55 50 45 40 0.1 1 FREQUENCY (MHz)
MEASURE AT TERMINATION
YIN 500mV/div YIN 200mV/div
MEASURE AT TERMINATION
YOUT 500mV/div YOUT 200mV/div 100ns/div 400ns/div
10
SUPPLY CURRENT vs. TEMPERATURE
DIFFERENTIAL GAIN (%)
MAX7453 toc07
68 66 SUPPLY CURRENT (mA) 64 62 60 58 56 54 52 50 -40 -15 10 35 60
MAX7453 toc08
70
0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1st 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1st 2nd 2nd
DIFFERENTIAL GAIN
MULTIBURST RESPONSE
MAX7453 toc09
YIN 500mV/div
3rd
4th
5th
6th MEASURED AT TERMINATION YOUT 500mV/div
DIFFERENTIAL PHASE (DEGREES)
DIFFERENTIAL PHASE
85
10s/div 3rd 4th 5th 6th
TEMPERATURE (C)
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs MAX7453
Pin Description
PIN 1 2 3 4 5 6 7 8 NAME YIN N.C. GND CIN COUT CVOUT VCC YOUT FUNCTION Luma (Y) Input No Connection. No internal connection. Ground Chroma (C) Input Chroma (C) Output Composite Video Output 5V Power Supply Luma (Y) Output
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 0.1F 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.
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 composite (CVOUT) video output. These devices operate from a single +5V supply. The filters have a nominal cutoff frequency optimized for NTSC, PAL, and SDTV.
Output Considerations
The outputs of the MAX7453 are typically connected to a 75 series back-match resistor followed by the video cable. Because of the inherent divide-by-two of this configuration, 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 220F.
Power-Supply Bypassing and Layout
The MAX7453 operates from a single +5V supply. Bypass VCC to GND with a 0.1F 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.
Filter
Filter Response The reconstruction filter consists of two 2nd-order Sallen-Key stages. The Butterworth-type response features a maximally flat passband for NTSC and PAL bandwidths. The stopband offers 42dB (typ) of attenuation at sampling frequencies of 27MHz and above (see the Typical Operating Characteristics).
Chip Information
TRANSISTOR COUNT: 4100 PROCESS: BiCMOS
Output Buffer
The YOUT and COUT buffers have a fixed +6dB gain capable of driving one standard 150 video load with a 2VP-P signal. The CVOUT buffer has a fixed +6dB gain, capable of driving two 150 video 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 output blanking level of less than 1V.
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Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs
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.)
MAX7453
INCHES DIM A A1 B C e E H L MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050
MILLIMETERS MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.19 0.25 1.27 BSC 3.80 4.00 5.80 6.20 0.40 1.27
N
E
H
VARIATIONS:
1
INCHES
MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC
TOP VIEW
DIM D D D
MIN 0.189 0.337 0.386
MAX 0.197 0.344 0.394
D A e B A1 L C
0-8
FRONT VIEW
SIDE VIEW
PROPRIETARY INFORMATION TITLE:
PACKAGE OUTLINE, .150" SOIC
APPROVAL DOCUMENT CONTROL NO. REV.
21-0041
B
1 1
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 (c) 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc.
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