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MC34118N Datasheet Voice Switched Speakerphone

Manufacturer: HTC KOREA

Overview: Voice Switched Speakerphone Circuit.

This datasheet includes multiple variants, all published together in a single manufacturer document.

General Description

The MC34118 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 adjustable gain and MUTE control, Transmit and Receive attenuators which operate in a complementary manner, level detectors at both input and output of both attenuators, and background noise monitors for both the transmit and receive channels.

A Dial Tone Detector prevents the dial tone from being attenuated by the Receive background noise monitor circuit.

Key Features

  • Improved Attenuator Gain Range: 52dB Between Transmit and Receive.
  • Low Voltage Operation for Line-Powered.

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