19-3269; Rev 0; 6/05 Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs 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 150Ω 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 (0°C to +70°C) 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 150Ω Video Loads YOUT and COUT Drive One 150Ω Video Load +5V Single-Supply Voltage 8-Pin SO Package Ordering Information PART TEMP RANGE MAX7453CSA 0°C to +70°C Applications PIN-PACKAGE 8 SO Pin Configuration Set-Top Boxes/HDRs/DVDs TOP VIEW Security Cameras/Digital Cameras YIN 1 Game Consoles 8 YOUT 7 VCC 3 6 CVOUT CIN 4 5 COUT N.C. 2 MAX7453 Digital VCRs GND Every Composite, S-Video Output for NTSC, PAL, and SDTV SO Functional Diagram VCC * ENCODER D/A YIN LOWPASS FILTER +6dB YOUT * MAX7453 D/A CIN LOWPASS FILTER Σ +6dB +6dB CVOUT * COUT * GND ________________________________________________________________ Maxim Integrated Products 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. 1 MAX7453 General Description MAX7453 Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs 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 = +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 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 = 0.1µF, RYOUT = 150Ω, RCOUT = 150Ω, RCVOUT = 75Ω, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL Passband Response Stopband Attenuation CONDITIONS MIN TYP MAX UNITS -0.6 -0.27 0 dB f = 27MHz 39 42 f = 3.58MHz, reference to CVOUT at 336kHz 96 98 100 % f = 100kHz to 4.2MHz, relative to 100kHz ASB Chroma/Luma Gain dB Differential Gain dG 5-step modulated staircase 0.15 0.5 % Differential Phase dθ 5-step modulated staircase 0.15 0.5 Degrees Signal-to-Noise Ratio SNR Peak signal (2VP-P) to RMS noise, f = 100Hz to 50MHz Line-Time Distortion HDIST 18µs, 100IRE bar 0.3 Field-Time Distortion VDIST 130 lines, 18µs, 100IRE bar 0.5 Clamp Settling Time 67 To ±1% Output DC Clamp Level 73 dB 300 % % Lines YOUT 0.60 0.8 0.95 CVOUT 0.60 0.8 0.95 COUT 1.44 1.6 1.95 -3.0 V Low-Frequency Gain Accuracy AV f = 100kHz, relative to 6dB Group-Delay Deviation ∆tg Deviation from 100kHz to 4.1MHz 8 Group-Delay Matching tg(MATCH) Low-frequency channel-to-channel matching, f = 100kHz for YOUT and COUT 2 ns f = 100kHz to 3.58MHz 61 dB Channel-to-Channel Crosstalk Input Leakage Current Input Dynamic Swing XTALK +2.0 % 16 ns IIN 10 YINP-P 1.2 CINP-P 0.9 µA VP-P SUPPLY Supply Voltage Range VCC Supply Current ICC Power-Supply Rejection Ratio 2 PSRR 4.75 VCC = +5.25V, no load 65 VIN = 100mVP-P, f = 0 to 3.5MHz 33 _______________________________________________________________________________________ 5.25 V 85 mA dB Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs AMPLITUDE vs. FREQUENCY PASSBAND AMPLITUDE vs. FREQUENCY 0 0 -30 -40 -50 -40 PHASE (DEGREES) AMPLITUDE (dB) -20 -0.5 -1.0 -1.5 -2.0 -120 -160 -240 NORMALIZED TO 0dB NORMALIZED TO 0dB -80 -3.0 10 1 -80 -200 -2.5 -70 MAX7453 toc03 0.5 -60 100 -280 0.1 10 1 FREQUENCY (MHz) FREQUENCY (MHz) GROUP DELAY vs. FREQUENCY 2T RESPONSE (1IRE = 7.4mV) 0.1 1 MODULATED 12.5T RESPONSE (1IRE = 7.14mV) MAX7453 toc06 MAX7453 toc04 85 80 10 FREQUENCY (MHz) MAX7453 toc05 90 GROUP DELAY (ns) PHASE RESPONSE vs. FREQUENCY 40 MAX7453 toc02 0 -10 AMPLITUDE (dB) 1.0 MAX7453 toc01 10 MAX7453 Typical Operating Characteristics (VCC = +5V, TA = +25°C, unless otherwise noted.) MEASURE AT TERMINATION 75 YIN 500mV/div 70 YIN 200mV/div 65 60 55 YOUT 500mV/div MEASURE AT TERMINATION 50 YOUT 200mV/div 45 40 0.1 10 1 100ns/div 400ns/div FREQUENCY (MHz) SUPPLY CURRENT (mA) 64 62 60 58 56 54 52 50 -40 -15 10 35 TEMPERATURE (°C) 60 85 MULTIBURST RESPONSE DIFFERENTIAL GAIN 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 MAX7453 toc09 MAX7453 toc08 66 DIFFERENTIAL PHASE (DEGREES) MAX7453 toc07 68 DIFFERENTIAL GAIN (%) SUPPLY CURRENT vs. TEMPERATURE 70 1st 2nd 3rd 4th 5th YIN 500mV/div 6th MEASURED AT TERMINATION DIFFERENTIAL PHASE 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 YOUT 500mV/div 10µs/div 1st 2nd 3rd 4th 5th 6th _______________________________________________________________________________________ 3 Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs MAX7453 Pin Description PIN NAME 1 YIN Luma (Y) Input FUNCTION 2 N.C. No Connection. No internal connection. 3 GND Ground 4 CIN Chroma (C) Input 5 COUT 6 CVOUT 7 VCC 5V Power Supply 8 YOUT 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 Chroma (C) Output Input Considerations Composite Video Output 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. 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. 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). Output Buffer Output Considerations The outputs of the MAX7453 are typically connected to a 75Ω 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 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 The YOUT and COUT buffers have a fixed +6dB gain capable of driving one standard 150Ω video load with a 2VP-P signal. The CVOUT buffer has a fixed +6dB gain, capable of driving two 150Ω 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. 4 _______________________________________________________________________________________ Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs N E H INCHES MILLIMETERS 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 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 SOICN .EPS DIM A A1 B C e E H L 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 N MS012 8 AA 14 AB 16 AC D C A B e 0∞-8∞ A1 L FRONT VIEW SIDE VIEW PROPRIETARY INFORMATION TITLE: PACKAGE OUTLINE, .150" SOIC APPROVAL DOCUMENT CONTROL NO. 21-0041 REV. 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 © 2005 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products, Inc. MAX7453 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.)