Telephone Listening-in. TEA1085A Datasheet

TEA1085A Listening-in. Datasheet pdf. Equivalent

Part TEA1085A
Description Line-powered Telephone Listening-in
Feature INTEGRATED CIRCUITS DATA SHEET TEA1085; TEA1085A Listening-in circuit for line-powered telephone s.
Manufacture NXP
Datasheet
Download TEA1085A Datasheet

INTEGRATED CIRCUITS DATA SHEET TEA1085; TEA1085A Listening TEA1085A Datasheet
Recommendation Recommendation Datasheet TEA1085A Datasheet




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



TEA1085A
Philips Semiconductors
Listening-in circuit for line-powered
telephone sets
Preliminary specification
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
EXTENDED TYPE
NUMBER
TEA1085/TEA1085A
TEA1085T/TEA1085AT
Notes
1. SOT101-1; 1998 Jun 18.
2. SOT137-1; 1998 Jun 18.
PINS
24
24
PIN POSITION
DIL
SO24
PACKAGE
MATERIAL
plastic
plastic
CODE
SOT101B(1)
SOT137A(2)
March 1992
2





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