Preliminary Data Video Switch for Dual SCART Connectors The MAX7457 4-channel video switch is ideal for antialiasing and DAC-smoothing video applications or wherever analog video is reconstructed from a digital data stream such as cable/satellite/terrestrial set-top boxes (STBs), DVD players, hard disk recorders (HDRs), and personal video recorders (PVRs). The MAX7457 filters and buffers CVBS and RGB video signals, making it ideal for dual SCART (peritelevision) STBs with an auxillary CVBS input. The MAX7457 operates from a single +5V supply and has a flat passband out to 5MHz with a stopband attenuation of 43dB at 27MHz, making it ideal for NTSC, PAL, and standard-definition digital TV (SDTV) video systems. The MAX7457 output buffers have a fixed gain of +6dB and are capable of driving two standard 150Ω video loads. The channel for CVBS video has high-frequency boost circuitry that enhances picture sharpness with up to +1.2dB of gain boost without degradation in the stopband. The video output drivers can be disabled by an external control input. The MAX7457 is available in a 16-pin, 5mm x 5mm x 0.8mm TQFN package, and is specified over the extended (-40°C to +85°C) temperature range. Applications STBs/HDRs Game Consoles DVD Players Digital VCRs Features ♦ 4-Channel Video Filter/Buffer for RGB and CVBS Signals with Auxiliary Input ♦ Allows Auxiliary Input for CVBS Video LoopThrough Applications ♦ Filter Response Ideal for NTSC, PAL, and Interlaced SDTV Video Signals ♦ 43dB (typ) Stopband Attenuation at 27MHz ♦ ±0.75dB (max) Passband Ripple Out to 5MHz ♦ Blanking Level Voltage on Cable <1V ♦ Each Channel Drives Two 150Ω Video Loads ♦ +5V Single-Supply Operation ♦ Available in 5mm x 5mm x 0.8mm, 16-Pin TQFN Ordering Information PART TEMP RANGE PIN-PACKAGE MAX7457ETE -40°C to +85°C 16 TQFN-EP* Pin Configuration appears at end of data sheet. Typical Operating Circuit VCC SELA 0.1µF 75Ω INA2 ENCODER 0.1µF INA1 CVBS D/A 2-TO-1 MUX LOWPASS FILTER SYNC DETECTOR +6dB 75Ω 75Ω INB R D/A LOWPASS FILTER +6dB 75Ω 75Ω INC LOWPASS FILTER +6dB 75Ω 75Ω LOWPASS FILTER +6dB MAX7457 * * 75Ω 75Ω * * 75Ω 75Ω OUTC 0.1µF IND 75Ω OUTB 0.1µF G D/A * OUTA 0.1µF B D/A T1655-2 *EP = Exposed pad. Desktop Video Editors AUXILIARY VIDEO SOURCE (VCR, DVD, ETC.) PKG CODE * * 75Ω 75Ω OUTD 75Ω * 75Ω *OPTIONAL CAPACITORS GND 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 MAX7457 General Description MAX7457 Video Switch for Dual SCART Connectors ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V INA1, INA2, INB, INC, IND to GND ............-0.3V to (VCC + 0.3V) OUTA, OUTB, OUTC, OUTD to GND .........-0.3V to (VCC + 0.3V) SELA, DISABLE to GND .............................-0.3V to (VCC + 0.3V) Maximum Current into Any Pin Except VCC and GND .....±50mA Continuous Power Dissipation (TA = +70°C) 16-Pin TQFN (derate 20.8mW/°C above +70°C)..........................................................1666.7mW 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-coupled load, RL = 75Ω to VCC/2 for AC-coupled load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, TA = +25°C.) PARAMETER SYMBOL CONDITIONS f = 100kHz to 5MHz, relative to 100kHz Passband Flatness MIN TYP MAX Channel INA_ +0.9 +1.2 +1.5 Channels INB, INC, IND -0.75 +0.15 +0.75 40 43 UNITS dB Stopband Attenuation ASB f ≥ 27MHz 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 dB 80 dB Channel INA_ 17 30 Channels INB, INC, IND 11 20 ∆tg Deviation from 100kHz to 4.1MHz Line-Time Distortion HDIST 18µs, 100 IRE bar 0.3 % Field-Time Distortion VDIST 130 lines, 18µs, 100 IRE bar 0.5 % Clamp Settling Time tCLAMP Group Delay Deviation Output DC Clamp Level To ±1% 0.6 0.9 1.1 Channel INB, INC, IND 1.1 1.5 1.8 -3 AV f = 100kHz, relative to gain of +6dB Low-Frequency Gain Matching AV(MATCH) Low-frequency channel-to-channel matching, f = 100kHz Group Delay Matching tg(MATCH) Low-frequency channel-to-channel matching, f = 100kHz XTALK Disabled Output Impedance ZDISABLE Output Short-Circuit Current ISC 2 Lines Channel INA_ Low-Frequency Gain Accuracy Channel-to-Channel Crosstalk 300 f = 100kHz to 3.58MHz 2 ns V +3 % 4 % ns -60 dB At 5MHz 2 kΩ OUT_ shorted to GND or VCC 70 mA _______________________________________________________________________________________ Video Switch for Dual SCART Connectors (VCC = +5V ±5%, CL = 0 to 20pF, RL = 75Ω to GND for DC-coupled load, RL = 75Ω to VCC/2 for AC-coupled load, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = 5V, TA = +25°C.) PARAMETER Input Leakage Current SYMBOL CONDITIONS MIN TYP IIN Input Dynamic Swing Mux Crosstalk MAX UNITS 10 µA Channel INA_ 1.2 Channels INB, INC, IND 0.9 f = 100kHz to 4.1MHz -60 VP-P dB SUPPLY Supply Voltage Range Supply Current VCC ICC Power-Supply Rejection Ratio PSRR 4.75 No load 100 VIN = 100mVP-P, f = 0 to 3.5MHz 40 5.25 V 140 mA dB LOGIC INTERFACE Logic Input High Voltage VIH Logic Input Low Voltage VIL Logic Input Current 2.0 VIL = 0 (sink), VIH = VCC (source) V 0.8 V ±10 µA _______________________________________________________________________________________ 3 MAX7457 ELECTRICAL CHARACTERISTICS (continued)