19-2990; Rev 0; 9/03 KIT ATION EVALU E L B A IL AVA 3-Channel Video Reconstruction Filter for RGB Component Video Features ♦ 3-Channel Filter and Buffer for RGB Video Signals The MAX7449 processes component RGB video signals. The output video buffers have a fixed gain of +6dB. The output video drivers can be disabled with an external pin. The MAX7449 is available in a 14-pin TSSOP package with an exposed pad, and is specified over the -40°C to +85°C extended temperature range. ♦ External Sync Signal Input ♦ Filter Response Ideal for NTSC, PAL, and Interlaced SDTV Video Signals ♦ 43dB (typ) Stopband Attenuation at 27MHz ♦ ±0.75dB (max) Passband Ripple at 5MHz ♦ Blanking Level Voltage on Output <1V ♦ Each Channel Drives Two 150Ω Video Loads ♦ +5V Single-Supply Voltage ♦ Small 14-Pin TSSOP Package Ordering Information PART Applications Set-Top Boxes/HDRs Game Consoles Desktop Video Editors DVD Players MAX7449EUD TEMP RANGE PIN-PACKAGE -40°C to +85°C 14 TSSOP-EP* *EP = Exposed pad. Digital VCRs Pin Configuration appears at end of data sheet. Functional Diagram VCC ENCODER 75Ω 75Ω 0.1µF R D/A * INA OUTA LOWPASS FILTER 75Ω * 75Ω 75Ω 0.1µF G D/A * INB OUTB LOWPASS FILTER 75Ω 75Ω 0.1µF B D/A 75Ω INC OUTC LOWPASS FILTER MAX7449 75Ω * * * 75Ω 75Ω 75Ω *OPTIONAL CAPACITORS GND EXTSYNC DISABLE ________________________________________________________________ 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 MAX7449 General Description The MAX7449, 3-channel, buffered video reconstruction filter is ideal for anti-aliasing and digital-to-analog converter (DAC)-smoothing video applications or wherever analog video is reconstructed from a digital data stream (such as cable/satellite/terrestrial set-top boxes, DVD players, hard-disk recorders (HDRs), and personal video recorders (PVRs)). This device operates from a single +5V supply and has a flat passband out to 5MHz with a stopband attenuation of 43dB at 27MHz. This makes it ideal for use with NTSC, PAL, and standarddefinition digital TV (SDTV) video systems. Each output is capable of driving two standard 150Ω video loads. MAX7449 3-Channel Video Reconstruction Filter for RGB Component Video 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) TSSOP-EP (derate 20.8mW/°C above +70°C) ...........1667mW 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 = +4.75V to +5.25V, CL = 0 to 20pF, RL = 75Ω to GND for DC-coupled load, RL = 75Ω to VCC / 2 for AC-coupled load, CIN_ = 0.1µF, GAIN = +6dB, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, TA = +25°C.) PARAMETER SYMBOL Passband Response CONDITIONS MIN TYP MAX UNITS f = 100kHz to 5MHz, relative to 100kHz, channels A, B, C -0.75 +0.15 +0.75 dB 39 43 Stopband Attenuation ASB f ≥ 27MHz Differential Gain dG dθ 5-step modulated staircase 0.15 0.50 % 5-step modulated staircase 0.15 0.50 Degrees Differential Phase Signal-to-Noise Ratio Group Delay Deviation Line-Time Distortion SNR Peak signal (2VP-P) to RMS noise, f = 100Hz to 50MHz 80 ∆tg Deviation from 100kHz to 4.1MHz 11 dB dB 20 ns 0.3 % HDIST 18µs, 100 IRE bar Field-Time Distortion VDIST 130 lines, 18µs, 100 IRE bar 0.5 % Clamp Settling Time tCLAMP To ±1% 100 Lines 1.8 V +3 % 4 % Output DC Clamp Level Low-Frequency Gain Accuracy AV Channels A, B, C 1.1 f = 100kHz -3 Low-Frequency Gain Matching Low-frequency channel-to-channel AV(MATCH) matching, f = 100kHz Group Delay Matching tg(MATCH) Channel-to-Channel Crosstalk XTALK Output Short-Circuit Current ISC Input Leakage Current IIN Input Dynamic Swing Low-frequency channel-to-channel matching, f = 100kHz 1.5 2 ns f = 100kHz to 3.58MHz 60 dB OUT_ shorted to GND or VCC 70 mA Channels A, B, C 10 µA 0.9 VP-P SUPPLY Supply Voltage Range VCC Supply Current ICC Power-Supply Rejection Ratio 2 PSRR 4.75 No load 75 VIN = 100mVP-P, f = 0 to 3.5MHz 40 _______________________________________________________________________________________ 5.25 V 100 mA dB 3-Channel Video Reconstruction Filter for RGB Component Video (VCC = +4.75V to +5.25V, CL = 0 to 20pF, RL = 75Ω to GND for DC-coupled load, RL = 75Ω to VCC / 2 for AC-coupled load, CIN_ = 0.1µF, GAIN = +6dB, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS LOGIC INPUTS (DISABLE and EXTSYNC) Output Impedance During Disable ZDISABLE Logic-Input High Voltage VIH Logic-Input Low Voltage VIL Logic Input Current At 5MHz 2 kΩ 2.0 ILOGIC V VIL = 0V (SINK), VIH = VCC (SOURCE) 0.8 V ±10 µA Typical Operating Characteristics (VCC = +5V, TA = +25°C, unless otherwise noted.) 200 MAX7449 toc02 MAX7449 toc01 0 PHASE RESPONSE vs. FREQUENCY PASSBAND AMPLITUDE vs. FREQUENCY 2.0 1.5 150 100 -40 -60 0.5 0 -0.5 -50 -100 -150 NORMALIZED TO 0dB 10 0 -1.0 -200 -2.0 1 50 -1.5 NORMALIZED TO 0dB -80 0.1 100 0.1 10 1 10 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) MAX7449 toc05 MAX7449 toc04 100 90 GROUP DELAY (ns) PHASE (DEGREES) AMPLITUDE (dB) AMPLITUDE (dB) 1.0 -20 MAX7449 toc03 AMPLITUDE vs. FREQUENCY 80 MAX7449 toc06 IN_ IN_ 250mV/div 250mV/div 70 OUT_ OUT_ 60 250mV/div 250mV/div 50 0.1 1 10 200ns/div 400ns/div FREQUENCY (MHz) _______________________________________________________________________________________ 3 MAX7449 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VCC = +5V, TA = +25°C, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE INPUTS BIASED TO +2V NO LOAD 110 100 90 80 -40 -15 10 35 60 85 TEMPERATURE (°C) 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 MAX7449 toc08 DIFFERENTIAL PHASE (DEGREES) DIFFERENTIAL GAIN (%) DIFFERENTIAL GAIN MAX7449 toc07 120 SUPPLY CURRENT (mA) MAX7449 3-Channel Video Reconstruction Filter for RGB Component Video 1st 2nd 3rd 4th 5th 6th DIFFERENTIAL PHASE 0.3 0.2 0.1 0 -0.1 -0.2 -0.3 1st 2nd 3rd 4th 5th 6th Pin Description 4 PIN NAME FUNCTION 1, 10 VCC +5V Supply Input 2 INA Channel A Video Input. Use channel A for the red (R) video signal. AC-couple INA with a series 0.1µF capacitor. 3 INB Channel B Video Input. Use channel B for the green (G) video signal. AC-couple INB with a series 0.1µF capacitor. 4 INC Channel C Video Input. Use channel C for the blue (B) video signal. AC-couple INC with a series 0.1µF capacitor. 5 DISABLE Disable Logic Input. Connect DISABLE to GND for normal operation. Connect DISABLE to VCC to disable all buffer outputs and put them in a high-impedance state. 6 EXTSYNC External Sync Input. Use TTL logic levels. A logic high enables the DC restore loop and clamps the output voltages to +1.5V (typ). 7, 8 GND Ground 9, 14 N.C. No Connection. Make no connection to these pins. 11 OUTC Channel C Buffer Output. This output can be either AC- or DC-coupled. 12 OUTB Channel B Buffer Output. This output can be either AC- or DC-coupled. 13 OUTA Channel A Buffer Output. This output can be either AC- or DC-coupled. _______________________________________________________________________________________ 3-Channel Video Reconstruction Filter for RGB Component Video Filter Filter Response The reconstruction filter consists of two 2nd-order SallenKey stages. The Butterworth-type response features a maximally flat passband for NTSC and PAL bandwidths. The stopband offers at least 43dB (typ) of attenuation at a sampling frequency of ≥27MHz (see the Typical Operating Characteristics). Output Buffers Each output buffer has a fixed gain of +6dB and can drive two 150Ω video loads with a 2VP-P signal. The MAX7449 can drive an AC load or drive the video load directly without using a large output capacitor. The output buffers drive DC loads with an output blanking level of less than 1V. Output Clamp Level When a sync pulse is detected on EXTSYNC, the DC restore loop is activated for channels A, B, and C. The function of the loop is to set the DC level of the video signal to the desired level. See Table 1 for clamp levels. Applications Information Input Considerations Use 0.1µF ceramic capacitors to AC-couple the inputs. These input capacitors store a DC level so the outputs are clamped to an appropriate DC voltage level. The MAX7449 allows R, G, or B video signals to be processed by any channel. G must not have sync information. Output Considerations The outputs 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 voltage on the video cable is always less than 1V, complying with industry-standard video requirements such as the European SCART standard (which allows up to 2V of DC on the video cable). 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 MAX7449 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. Exposed Pads The TSSOP-EP package has an exposed pad on the bottom of the package. This pad is electrically connected to GND and should be connected to the ground plane for improved thermal conductivity. Do not route signals under this package. Pin Configuration TOP VIEW Table 1. Output Clamp Level 14 N.C. VCC 1 CLAMP LEVEL (V) INA 2 13 OUTA A 1.5 INB 3 12 OUTB B 1.5 INC 4 C 1.5 CHANNEL MAX7449 DISABLE 5 11 OUTC 10 VCC EXTSYNC 6 9 N.C. GND 7 8 GND TSSOP Chip Information TRANSISTOR COUNT: 6300 PROCESS: BiCMOS _______________________________________________________________________________________ 5 MAX7449 Detailed Description The MAX7449 filters and buffers video-encoder DAC outputs in applications such as set-top boxes, HDRs, DVD players, and digital VCRs. The MAX7449 reconstructs and cleans up component RGB analog video signals. Each channel consists of a lowpass filter and an output video buffer that drives two standard 150Ω video loads. This device operates from a single +5V supply and has a nominal cutoff frequency of 5MHz optimized for NTSC, PAL, and SDTV. 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.) TSSOP 4.4mm BODY.EPS MAX7449 3-Channel Video Reconstruction Filter for RGB Component Video PACKAGE OUTLINE, TSSOP, 4.40 MM BODY EXPOSED PAD 21-0108 C 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. 6 _____________________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.