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Low-Power Video Switches for Dual SCART Connectors

Low-Power, Video-Only Dual SCART Reduces Cost and Provides Flexibility in System Designs

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Dual SCART Support for Video Signals
  • Supports CVBS Input from TV SCART (MAX9656)
  • Reconstruction Filters with 9.5MHz Passband and 47dB Attenuation at 27MHz
  • Fixed Gain of 2V/V
  • Input Sync-Tip Clamps
  • 2.7V to 3.6V Single-Supply Operation

Applications/Uses

  • SCART Set-Top Boxes

Description

The MAX9655/MAX9656 dual SCART switches route video signals between a set-top box decoder chip and two external SCART connectors. Under the control of the TV_SEL logic input, the MAX9655 selects whether the CVBS and RGB signals from the encoder or the VCR SCART are routed to the TV SCART. The CVBS signal from the encoder is always routed to the VCR SCART.

The MAX9656 is similar to the MAX9655 except that under the control of the VCR_SEL logic input, the MAX9656 selects whether the CVBS signal from the encoder or the TV SCART is routed to the VCR SCART. The MAX9656 also features a low-power shutdown mode, in which quiescent current falls to 35µA.

The incoming video signals must be AC-coupled to the inputs, which have sync-tip clamps to set the internal DC level. After the input stages, multiplexers select which video signals are routed to the reconstruction filters and output amplifiers. The reconstruction filters are optimized for standard-definition signals and typically have ±1dB passband flatness out to 9.5MHz and 47dB attenuation at 27MHz.

The amplifiers have 2V/V gain, and the outputs can be DC-coupled to a 75Ω load, which is the equivalent of two video loads, or AC-coupled to a 150Ω load.

Simplified Block Diagram

MAX9655, MAX9656: Functional Diagram MAX9655, MAX9656: Functional Diagram Zoom icon

Technical Docs

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 .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.