19-2749; Rev 0; 1/03 Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs Features ♦ Triple-Channel Filter and Buffer for CVBS and Y/C (S-Video) ♦ Filter Response Ideal for NTSC, PAL, and Interlaced SDTV Signals ♦ 41dB (typ) Stopband Attenuation at 27MHz ♦ -0.3dB (typ) Passband Response ♦ Low Blanking Level Voltage Allows DC-Coupled Output ♦ Each Channel Drives Two 150Ω Video Loads ♦ +5V Single-Supply Voltage ♦ Tiny 8-Pin Thin QFN or 8-Pin SO Packages Ordering Information The MAX7443/MAX7444 are available in a tiny 8-pin thin QFN and an 8-pin SO package with exposed pad, and are fully specified over the -40°C to +85°C extended temperature range. PART TEMP RANGE PIN-PACKAGE TOP MARK MAX7443ETA -40°C to +85°C 8 Thin QFN-EP* AFX Applications MAX7443ESA -40°C to +85°C 8 SO-EP* MAX7444ETA -40°C to +85°C 8 Thin QFN-EP* MAX7444ESA -40°C to +85°C 8 SO-EP* Set-Top Boxes/HDR/DVD Digital VCRs Security Cameras/Digital Cameras Every Composite, S-Video Output for NTSC, PAL, SDTV Game Consoles — AFY — *EP = Exposed pad. Selector Guide appears at end of data sheet. Functional Diagram VCC * * ENCODER YIN D/A 6dB/ 9.5dB/ 12dB LOWPASS FILTER YOUT * MAX7443 MAX7444 D/A CIN LOWPASS FILTER Σ 6dB/ 9.5dB/ 12dB 6dB/ 9.5dB/ 12dB CVOUT * COUT * * GND GSET *OPTIONAL ________________________________________________________________ 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 MAX7443/MAX7444 General Description The MAX7443/MAX7444 are low-cost, triple-channel video reconstruction filters for S-video and CVBS video signals. These devices are ideal for anti-aliasing and DAC smoothing video applications such as set-top boxes, DVD players, hard-disk recorders (HDRs), and personal video recorders. These filters operate from a single +5V supply. They are optimized for NTSC, PAL, and standard-definition digital TV (SDTV) video systems. Each channel consists of a lowpass filter and an adjustable-gain output buffer capable of driving two 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 MAX7444 offers highfrequency boost to improve picture sharpness. The MAX7443 has a maximum flat-frequency response. MAX7443/MAX7444 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 Thin QFN (derate 24.4mW/°C above +70°C) ...1951mW 8-Pin SO (derate 18.9mW/°C above +70°C)..............1509mW Operating Temperature Range ...........................-40°C to +85°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, RL = 75Ω to GND for DC-couple, RL = 75Ω to VCC/2 for AC-couple, CYIN = CCIN = 0.1µF, TA = TMIN to TMAX, GSET = GND (6dB) and VCC (9.5dB), unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER SYMBOL f = 100kHz to 4.2MHz, relative to 100kHz Passband Response Stopband Attenuation CONDITIONS ASB MIN TYP MAX UNITS MAX7443 -0.8 -0.3 +0.1 MAX7444 -0.1 +0.6 +0.92 39 41 dB 0.6 dB f = 27MHz dB Boost Amplitude f = 4.2MHz, MAX7444 Differential Gain dG 5-step modulated staircase Gain = 6dB, 9.5dB, 12dB 0.15 0.4 % Differential Phase dθ 5-step modulated staircase Gain = 6dB, 9.5dB, 12dB 0.15 0.4 Degrees SNR Peak signal (2VP-P) to RMS noise, f = 100Hz to 50MHz Gain = 6dB, 9.5dB, 12dB ∆tg Deviation from 100kHz to 4.1MHz Signal-to-Noise Ratio Group Delay Deviation 67 73 dB MAX7443 8 20 MAX7444 12 30 ns Line-Time Distortion HDIST 18µs, 100 IRE bar 0.3 % Field-Time Distortion VDIST 130 lines, 18µs, 100 IRE bar 0.5 % To ±1% 100 Lines Clamp Settling Time Output DC Clamp Level Low-Frequency Gain Accuracy Group Delay Matching Channel-to-Channel Crosstalk Input Leakage Current 2 AV tg(MATCH) XTALK YOUT 0.6 0.8 CVOUT 0.6 0.8 1.0 1.0 COUT 1.44 1.6 1.97 f = 100kHz, relative to 6dB -3.5 +2 V % Low-frequency channel-to-channel matching, f = 100kHz for YOUT and COUT 2 ns f = 100kHz to 3.58MHz, gain = 6dB 61 dB IIN _______________________________________________________________________________________ 10 µA Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs (VCC = +5V ±5%, CL = 0 to 20pF, RL = 75Ω to GND for DC-couple, RL = 75Ω to VCC/2 for AC-couple, CYIN = CCIN = 0.1µF, TA = TMIN to TMAX, GSET = GND (6dB) and VCC (9.5dB), unless otherwise noted. Typical values are at TA = +25°C.) PARAMETER Input Dynamic Swing SYMBOL CONDITIONS MIN TYP MAX YINP-P GSET = GND (6dB) 1.2 CINP-P GSET = GND (6dB) 0.9 UNITS VP-P SUPPLY Supply Voltage Range VCC Supply Current 4.75 ICC Power-Supply Rejection Ratio PSRR VCC = +5.25V, no load 88 VIN = 100mVP-P, f = 0 to 3.5MHz 33 5.25 V 110 mA dB Typical Operating Characteristics (VCC = +5V, TA = +25°C, unless otherwise noted.) AMPLITUDE vs. FREQUENCY -40 0.5 0 MAX7443 -0.5 -1.0 -60 NORMALIZED TO 0dB MAX7443/44 toc03 MAX7444 150 100 PHASE (DEGREES) 1.0 AMPLITUDE (dB) -20 1.5 PHASE RESPONSE vs. FREQUENCY 200 MAX7443/44 toc02 MAX7443/44 toc01 0 AMPLITUDE (dB) PASSBAND AMPLITUDE vs. FREQUENCY 2.0 50 0 -50 -100 -1.5 -150 NORMALIZED TO 0dB -80 -2.0 10 -200 0.1 1 10 0.1 1 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) GROUP DELAY vs. FREQUENCY 2T RESPONSE (1 IRE = 7.14mV) MODULATED 12.5T RESPONSE (1 IRE = 7.14mV) 80 MAX7443/44 toc05 MAX7443/44 toc04 90 GROUP DELAY (ns) 100 YIN 200mV/div 70 10 MAX7443/44 toc06 1 YIN 200mV/div 60 50 YOUT 200mV/div YOUT 400mV/div 40 0.1 1 10 200ns/div 400ns/div FREQUENCY (MHz) _______________________________________________________________________________________ 3 MAX7443/MAX7444 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VCC = +5V, TA = +25°C, unless otherwise noted.) 80 75 70 65 -15 10 35 60 85 TEMPERATURE (°C) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 MAX7443/44 toc08 DIFFERENTIAL PHASE (DEGREES) DIFFERENTIAL GAIN (%) MAX7443/44 toc07 85 -40 1 2 3 NAME 1 YIN 2 GSET 5 6 1 2 3 FUNCTION 4 5 YIN 200mV/div 7 YOUT 200mV/div 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 6 7 10µs/div These devices operate from a single +5V supply. The filters have a nominal cutoff frequency optimized for NTSC, PAL, and SDTV. Filter Luma (Y) Input Gain-Setting Control Input. See Table 1 for values. 3 CIN Chroma (C) Input 4 GND Ground 5 VCC 5V Power Supply 6 COUT 7 CVOUT 8 YOUT Chroma (C) Output Composite Video Output Luma (Y) Output Detailed Description The primary function of the MAX7443/MAX7444 is to filter and buffer the encoder DAC outputs that contain digital video information in applications such as set-top boxes, hard-disk recorders, DVD players, and digital VCRs. These devices reconstruct and clean up analog video signals. Each MAX7443/MAX7444 consists of a lowpass filter and an adjustable-gain output video buffer that is capable of driving two standard 150Ω video loads. The luma (YIN) and chroma (CIN) video inputs are summed internally to provide the composite (CVOUT) video output. 4 4 DIFFERENTIAL PHASE Pin Description PIN MULTIBURST RESPONSE DIFFERENTIAL GAIN 90 MAX7443/44 toc09 SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT (mA) MAX7443/MAX7444 Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs 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 41dB (typ) of attenuation at sampling frequencies of 27MHz and above (see Typical Operating Characteristics). High-Frequency Boost The high-frequency boost available in the MAX7444 compensates for signal degradation and rolloff in the video encoder, which increases the image sharpness. The MAX7443 has a flat response over the video bandwidth. Output Buffer The output buffer drives two 150Ω video loads with a 2VP-P signal. The adjustable gain of the output buffer provides a gain of 6dB, 9.5dB, and 12dB, which are selected by tying the GSET pin to GND, VCC, or floating, respectively. The MAX7443/MAX7444 can drive an AC load or drive the video load directly without using the large output capacitor. The output buffer drives a DC load with an output blanking level of less than 1V. _______________________________________________________________________________________ Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs GSET GAIN (dB) PART HIGH-FREQUENCY BOOST No GND 6 MAX7443ETA VCC 9.5 MAX7443ESA No 12 MAX7444ETA Yes MAX7444ESA Yes Open 12dB Gain Setting The GSET pin is biased internally to VCC/2 through two 100kΩ resistors from VCC to GND. The internal impedance at the node is 50kΩ. No additional connection is necessary since the pin offers a minimum noise margin immunity of 1VP-P. 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 the average DC voltage of COUT at 1.6V. Pin Configurations TOP VIEW YIN 1 GSET 2 CIN 3 GND 4 MAX7443 MAX7444 8 YOUT 7 CVOUT 6 COUT 5 VCC 8 YOUT 7 CVOUT 6 COUT 5 VCC Applications Information THIN QFN Input Considerations Use a 0.1µF ceramic capacitor to AC-couple the input to the MAX7443/MAX7444. 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 MAX7443/MAX7444 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 MAX7443/MAX7444 operate 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. Refer to the MAX7443 evaluation kit for a proven PC board layout example. YIN 1 GSET 2 CIN 3 GND 4 MAX7443 MAX7444 SO Chip Information TRANSISTOR COUNT: 4252 PROCESS: BiCMOS Exposed Pads Both the SO and thin QFN packages of the MAX7443/ MAX7444 have exposed pads on the bottom of the packages. These pads are electrically connected to GND and should be connected to the ground plane for improved thermal conductivity. Do not route signals under these packages. _______________________________________________________________________________________________________ 5 MAX7443/MAX7444 Selector Guide Table 1. Gain-Setting Control 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.) 8L, SOIC EXP. PAD.EPS MAX7443/MAX7444 Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs 6 _______________________________________________________________________________________ Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs 6, 8, &10L, QFN THIN.EPS PACKAGE OUTLINE, 6, 8 & 10L, QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm 21-0137 C _______________________________________________________________________________________ 7 MAX7443/MAX7444 Package Information (continued) (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.) MAX7443/MAX7444 Triple-Channel Video Reconstruction Filter and Buffer for Composite and Y/C Outputs Package Information (continued) (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.) COMMON DIMENSIONS SYMBOL A MIN. MAX. 0.70 0.80 D 2.90 3.10 E 2.90 3.10 A1 0.00 0.05 L k 0.20 0.40 0.25 MIN A2 0.20 REF. PACKAGE VARIATIONS PKG. CODE N D2 E2 e JEDEC SPEC b T633-1 6 1.50–0.10 2.30–0.10 0.95 BSC MO229 / WEEA 0.40–0.05 1.90 REF T833-1 8 1.50–0.10 2.30–0.10 0.65 BSC MO229 / WEEC 0.30–0.05 1.95 REF T1033-1 10 1.50–0.10 2.30–0.10 0.50 BSC MO229 / WEED-3 0.25–0.05 2.00 REF [(N/2)-1] x e PACKAGE OUTLINE, 6, 8 & 10L, QFN THIN (DUAL), EXPOSED PAD, 3x3x0.80 mm 21-0137 C 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.