Order this document by MC33219A/D MC33219A Voice Switched Speakerphone The Motorola MC33219A Voice Switched Speakerphone Circuit incorporates the necessary amplifiers, attenuators, level detectors, and control algorithm to form the heart of a high quality hands free speakerphone system.
Included are a microphone amplifier with mute, transmit and receive attenuators, a background monitoring system for both the transmit and receive paths, and level detectors for each path.
An AGC system r