Order this document by MC33218A/D Advance Information Voice Switched Speakerphone with Microprocessor Interface The Motorola MC33218A 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 reduces the receive gain on long lines where loop current and power are in short supply.
A dial tone detector prevents fading of dial tone.
A Chip Disable pin permits c...

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