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MC33215 - Telephone Line Interface and Speakerphone Circuit

Key Features

  • Line Driver and Supply.
  • AC and DC Termination of Telephone Line.
  • Adjustable Set Impedance for Real and Complex Termination.
  • Efficient Supply Point for Loudspeaker Amplifier and Peripherals.
  • Two Stabilized Supply Points for Handset and Base Microphones.
  • Separate Supply Arrangement for Handset and Speakerphone Operation Handset Operation.
  • Transmit and Receive Amplifiers.
  • Differential Microphone Inputs.
  • Sidetone Cancellation Ne.

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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 MC33215/D MC33215 Advance Information Telephone Line Interface and Speakerphone Circuit The MC33215 is developed for use in fully electronic telephone sets with speakerphone functions. The circuit performs the ac and dc line termination, 2–4 wire conversion, line length AGC and DTMF transmission. The speakerphone part includes a half duplex controller with signal and noise monitoring, base microphone and loudspeaker amplifiers and an efficient supply. The circuit is designed to operate at low line currents down to 4.0 mA enabling parallel operation with a classical telephone set.