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TEA1085A Datasheet Line-powered Telephone Listening-in

Manufacturer: NXP Semiconductors

Overview: INTEGRATED CIRCUITS DATA SHEET TEA1085; TEA1085A Listening-in circuit for line-powered telephone sets Preliminary specification File under Integrated Circuits, IC03A March 1992 Philips Semiconductors Preliminary.

General Description

The TEA1085 and TEA1085A are bipolar ICs which have been designed for use in line-powered telephone sets and provide a listening-in facility for the received line signal via a loudspeaker.

Nearly all the line current can be used for powering the loudspeaker.

The circuits incorporate a supply circuit, loudspeaker amplifier dynamic limiter, MUTE circuit, power-down facility and logic inputs for gain setting.

Key Features

  • Internal supply optimum current split-up - low constant current (adjustable) in transmission IC - nearly all line current available for listening-in adjustable supply voltage.
  • Loudspeaker amplifier dynamic limiter providing low distortion and the highest possible output power SE or BTL drive for loudspeaker volume control by potentiometer and/or logic inputs (e. g. microcontroller drive) fixed gain of 35 dB.
  • Larsen level limiter low sensitivity for own speech due to 3r.

More Datasheets from NXP Semiconductors

Part Number Description
TEA1085 Line-powered Telephone Listening-in
TEA1081 telephone set peripherals power-down
TEA1083 Call progress monitor
TEA1083A Call progress monitor
TEA1039 switched-mode power-supply
TEA1062 Low voltage transmission
TEA1062A Low voltage transmission
TEA1062AM1 Low voltage transmission
TEA1062AT Low voltage transmission
TEA1062M1 Low voltage transmission

TEA1085A Distributor