Description

The CXA2149Q is a video and audio switch IC featuring I2C bus compatibility for TV’s.  The IC has

input pins that are compatible with the SCART protocols.  It offers other features such as an

electronic mute function with switching noise reduction (zero cross detection), electronic volume

control, automatic SYNC pulse detection, and group delay control.

Features

• 3 CVBS inputs.

• 2 CVBS outputs.

• Group delay control on TV and CVIN1.

• SYNC ID on TV and CVIN1.

• 3 Y/C inputs.

• 2 Y/C outputs.

• 6 L/R/2 inputs.

• 3 L/R/2 outputs.

• Mode inputs compatible with the SCART protocol.

• 3 Y/C mixer circuits.

• Audio muting via software control.

• External muting input.

• Audio switching noise elimination circuit.

• Volume adjustment via software control on L/R channel 3.

• Wide band video amplifiers (20 MHz, –3 dB).

• Wide audio dynamic range (3 Vrms typ)

• Serial control via I2C bus.

• Separate control of video and audio switches.

• High impedance maintained by I2C lines (SDA, SCL) even when power is off.

• Configurable dual slave address 90/92.

• I2C bus 5 and 3.3 V compatible.



Applications

TV’s