Description

The Sony CXA2161R is an Audio/Video switch designed primarily for application in Digital Set Top Boxes. It provides video and audio routing from the digital encoder source to the TV and VCR scart (peritelevision) connectors. In addition, the TV audio output has a programmable volume control. The chip is programmed by means of an I2C interface and can operate from a single or dual power supply.

Target specifications: Canal+, BSkyB, TPS, NorDig, and ECCA Euro-Box

Features

Supply

• Single: 0V, +5V, +12V

• Dual: 0V, –5V, +5V and +12V (Low number of external parts required) Video

• 2 scart switching (VCR, TV)

• VCR input supports RGB mode

• Integrated 75Ω drivers for direct video connection

• Y/C mixer with trap for RF modulators

• Switchable clamps on inputs

• Adjustable gain on RGB outputs

• Video output shutdown for low power modes

• Fast blanking switch

• Slow blanking switch for TV and VCR output

• SVHS switch on VCR output

• Y/C auxiliary input

Audio

• Four stereo audio inputs

• Volume control (–56dB to +6dB in 2dB steps)

• Additional switchable gain on audio DAC inputs

• Audio overlay facility

• Volume bypass for TV and Phono outputs

• Mono switching on TV, VCR outputs

• High drive capability (600Ω loads possible)

• Switchable audio limiter function

• Switchable Mono output for RF modulators

• Audio output disable

I2C and Logic

• Fast mode compatible I2C bus

• Function monitor with loop through

• Interrupt output for function monitor

• Logic output pin

• Sync detector for Y/CVBS inputs

Applications

• Digital Set Top Box

• Integrated digital television