TEA1085

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 specification Listening-in circuit for line-powered telephone sets 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 3rd-order filter and attack delay adjustable voltage thresholds Power down input MUTE input TEA1085/TEA1085A - clickfree switching between listening-in mode and standby mode TEA1085 - toggle function - start-up in standby condition TEA1085A - logic level input ORDERING INFORMATION EXTENDED TYPE NUMBER TEA1085/TEA1085A TEA1085T/TEA1085AT Notes 1. SOT101-1; 1998 Jun 18. 2. SOT137-1; 1998 Jun 18. PACKAGE PINS 24 24 PIN POSITION DIL SO24 TEA1085; TEA1085A 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 loudspea...