XR-T6420-1 Speakerphone Audio Circuit GENERAL DESCRIPTION The XR-T6420-1 is a monolithic integrated circuit for use in high performance speakerphone systems.
It is designed to be used with the XR-T6421 Speakerphone Control Circuit.
The XR-T6420-1 contains the audio paths comprising the following: Two variable gain cells, a microphone amplifier, a transmitting amplifier, a receive amplifier, and a speaker amplifier.
FUNCTIONAL BLOCK DIAGRAM XR-T6420-1 SPI SPC SPO LiLJ~--VEE RVO RXC RVI_ _--'-,YI RVO FEATURES Two Matched Variable GaiA Cells Internal Microphone Amplifier Independent Control of Transmitting and Receiving Levels External Control of Gains and Freq·uency Response GND VCC TXO ...

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