Low-Power Audio/Video Switch for Dual SCART Connectors

Industry's First 3.3V, Dual SCART Solution Minimizes Power Consumption in Set-Top Box and DVD Applications


The MAX9598 dual SCART matrix routes audio and video signals between a set-top box decoder chip and two external SCART connectors under I²C control. Operating from a 3.3V supply and a 12V supply, the MAX9598 consumes 70mW during quiescent operation and 471mW during average operation when driving typical signals into typical loads. Video input detection, video load detection, and a 1.7mW low-power mode facilitate the design of low-power set-top boxes.

The MAX9598 audio section contains a buffered cross-point to route audio inputs to audio outputs. The DirectDrive® output amplifiers create a 2VRMS full-scale audio signal biased around ground, eliminating the need for bulky output capacitors and reducing click-and-pop noise. The zero-cross detection circuitry also further reduces clicks and pops by enabling audio sources to switch only during a zero-crossing.

The MAX9598 video section contains a buffered cross-point to route video inputs to video outputs. The standard-definition video signals from the set-top box decoder chip are lowpass filtered to remove out-of-bandwidth artifacts.

The MAX9598 also supports slow-switching and fast-switching signals. An interrupt signal from the MAX9598 informs the microcontroller (µC) when the system status has changed.

The MAX9598 is available in a compact 40-pin thin QFN package and is specified over the 0°C to +70°C commercial temperature range.
MAX9598: System Block Diagram MAX9598: System Block Diagram Enlarge+

Key Features

  • 70mW Quiescent Power Consumption
  • 1.7mW Low-Power Mode Consumption
  • 0.1mW Shutdown Consumption
  • Clickless/Popless, DirectDrive Audio
  • Video Input Detection
  • Video Load Detection
  • Video Reconstruction Filter with 10MHz Passband and 52dB Attenuation at 27MHz
  • 3.3V and 12V Supply Voltages


  • DVD Players
  • Set-Top Boxes
  • TVs

Quality and Environmental Data

Product Reliability Reports: MAX9598.pdf 
Lead-Free Package Tin (Sn) Whisker Reports

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