MC33218A - VOICE SWITCHED SPEAKERPHONE

Motorola Semiconductor (now NXP Semiconductors)

Key Features

Output swing is limited by the capability of the receive attenuator input. See Figure 16. 4.

MC33218A voice switched speakerphone by Motorola Semiconductor (now NXP Semiconductors) - Datasheet Preview

Datasheet Details

Part number	MC33218A
Manufacturer	Motorola Semiconductor (now NXP Semiconductors)
File Size	411.83 KB
Description	VOICE SWITCHED SPEAKERPHONE
Datasheet	MC33218A Datasheet

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Full PDF Text Transcription (Reference)

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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 conserving power when the circuit is not in use.