MAX7457

Video Switch for Dual SCART Connectors

Data Sheet (Rev. 0)

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Overview

4-Channel Video Filter/Buffer for RGB and CVBS Signals with Auxiliary Input

Allows Auxiliary Input for CVBS Video Loop-Through 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

The MAX7457 4-channel video switch is ideal for anti-aliasing 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 auxiliary 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