XR-T6421 Datasheet - Exar

XR-T6421 Speakerphone Control IC

The XR-T6421 is a monolithic integrated circuit for use in high performance speakerphone systems. It is designed to provide all control functions for the XR-T6420-1 or XR-T 6420-2 speakerphone audio circuit. The XR-T6421 contains the level sensors and logic necessary to change the attenuation in 'th.

XR-T6421 Features

* Low Current Background Noise Detection and Suppression External Control of Attach and Decay Time Constants Independent Control of Gain and Frequency Response Provides Three Level Control of Transmit & Receive Paths FUNCTIONAL BLOCK DIAGRAM VCON VOL MCR-IN MCA

* OUT NOISE TXA

* IN TXA

* OUT

XR-T6421-Exar.pdf