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MC33219A - VOICE SWITCHED SPEAKERPHONE CIRCUIT

General Description

Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Symbol CP2 XDI CPT TLI TLO VB CT CD NC CPR RLI RLO GND RAO RAI RXO RXI MUTE VLC Description A capacitor at this pin stores voltage representing the transmit background noise and speech levels for the background noise monitor.

Key Features

  • ound noise monitor. Input to the transmit background noise monitor. An RC sets the time constant for the transmit background noise monitor. Input to the transmit level detector. Output of the transmit level detector. A mid.
  • supply reference voltage, and analog ground for the amplifiers. This must be well bypassed for proper power supply rejection. An RC sets the switching time between transmit, receive and idle modes. Chip Disable (Logic Input). When low, the IC is active. When high, the.

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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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 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. The volume control can be implemented with a potentiometer.