MAX7448

4-Channel RGB Video Filter with Asynchronous CVBS Input

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Overview

4-Channel Filter and Buffer for RGB and CVBS Video Signals
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 Voltage
Small 14-Pin TSSOP Package

The MAX7448, 4-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 standard-definition digital TV (SDTV) video systems. Each output is capable of driving two standard 150Ω video loads.

The MAX7448 processes RGB and asynchronous CVBS video signals. The output video buffers have a fixed gain of +6dB. The channel used for CVBS video has high-frequency boost circuitry, which provides picture sharpness with +1.2dB of gain boost without degradation in the stopband. The output video drivers can be disabled with an external pin.

The MAX7448 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.

Applications