XR-T6421
XR-T6421 is Speakerphone Control IC manufactured by Exar.
DESCRIPTION
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 'the transmitting or receiving path in order to avoid acoustic feedback.
Circuitry is included to detect bacground noise level and provide a preset amount of attenuation in each path when no voice is present.
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 CMPBTHB CMPB+
SIGNAL CMPA+
A- OUT
VAEF AXA- OUT AXA- IN HPF- OUT HPF- IN A- IN
ORDERING INFORMATION
Part Number XR-T6421CN...
