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4-Channel Video Reconstruction Filter

4-Channel Video Reconstruction Filters Ideal for European SCART Set-Top Boxes

Product Details

Key Features

Simplified Block Diagram

Technical Docs

Data Sheet 4-Channel Video Reconstruction Filter Dec 08, 2005

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Key Features

  • 4-Channel Filter and Buffer for CVBS, RGB, or Y/C 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
  • Selectable Gain: +6dB, +9.5dB, and +12dB
  • Small 14-Pin TSSOP Package

Applications/Uses

  • Desktop Video Editors
  • Digital VCRs
  • DVD Players
  • Game Consoles
  • Set-Top Boxes/HDRs

Description

The MAX7445 4-channel, buffered video reconstruction filter 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, 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 MAX7445 has three modes of operation. Mode 1 processes CVBS and RGB video signals. Mode 2 processes CVBS, Y, and C signals, as well as a second asynchronous CVBS video signal. Mode 3 processes RGB and CVBS (asynchronous) video signals. An external pin adjusts the gain of the video buffer to either +6dB, +9.5dB, or +12dB to accommodate video-encoder DAC output signals of < 1V. High-frequency boost circuitry 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 MAX7445 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.

Simplified Block Diagram

Technical Docs

Data Sheet 4-Channel Video Reconstruction Filter Dec 08, 2005

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .