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TEA1085T Scheda tecnica(PDF) 2 Page - NXP Semiconductors |
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TEA1085T Scheda tecnica(HTML) 2 Page - NXP Semiconductors |
2 / 32 page March 1992 2 Philips Semiconductors Preliminary specification Listening-in circuit for line-powered telephone sets TEA1085; TEA1085A 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 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. The devices also incorporate a Larsen Level Limiter to reduce howling effects. The ICs are intended for use in conjunction with a transmission circuit of the TEA1060 family. ORDERING INFORMATION Notes 1. SOT101-1; 1998 Jun 18. 2. SOT137-1; 1998 Jun 18. EXTENDED TYPE NUMBER PACKAGE PINS PIN POSITION MATERIAL CODE TEA1085/TEA1085A 24 DIL plastic SOT101B(1) TEA1085T/TEA1085AT 24 SO24 plastic SOT137A(2) |
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