MAX9671

19-4653; Rev 0; 7/09 KIT ATION www.DataSheet4U.com EVALU E L B AVAILA Low-Power Audio/Video Switch with Audio Volume Control for Dual SCART Connectors General Description The MAX9670/MAX9671 dual SCART matrices route 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 MAX9670/MAX9671 consume 70mW during quiescent operation and 471mW during average operation when driving typical signals into typical loads. Video input detection, video load detection, and a 2.5mW standby mode facilitate the design of intelligent, low-power set-top boxes. The MAX9670/MAX9671 audio section contains a buffered crosspoint to route audio inputs to audio outputs and programmable volume control from -62dB to 0dB in 2dB steps. 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 zerocrossing. The MAX9671 offers TV left and right audio inputs. The MAX9670/MAX9671 video section contains a buffered crosspoint to route video inputs to video outputs. The standard-definition video signals from the settop box decoder chip are lowpass filtered to remove out-of-band artifacts. The MAX9670/MAX9671 also support slow-switching and fast-switching signals. An in...