TEA1064A View Datasheet(PDF) - Philips Electronics

Part Name

Description

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TEA1064A

Low voltage versatile telephone transmission circuit with dialler interface and transmit level dynamic limiting

Philips Electronics 

Philips Semiconductors

Product specification

Low voltage versatile telephone transmission circuit

with dialler interface and transmit level dynamic limiting

TEA1064A

GENERAL DESCRIPTION

The TEA1064A is a bipolar integrated circuit that performs

all the speech and line interface functions required in fully

electronic telephone sets. It performs electronic switching

between dialling and speech and has a powerful DC

supply for peripheral circuits. The IC operates at line

voltages down to 1.8 V DC (with reduced performance) to

facilitate the use of more telephone sets connected in

parallel. The transmit signal on the line is dynamically

limited (speech-controlled) to prevent distortion at high

transmit levels of both the sending signal and the sidetone.

PACKAGE OUTLINES

TEA1064A :20-lead DIL; plastic (SOT146).(1)

TEA1064AT:20-lead mini-pack; plastic (SO20;

SOT163A).(2)

Notes

1. SOT146-1; 1998 Jun 18.

2. SOT163-1; 1998 Jun 18.

FEATURES

• Low DC line voltage; operates down to 1.8 V (excluding

polarity guard)

• Voltage regulator with low voltage drop and adjustable

static resistance

• DC line voltage adjustment facility

• Provides a supply for external circuits in two options:

unregulated supply, regulated line voltage;

stabilized supply, line voltage varies with supply

current

• Dynamic limiting (speech-controlled) in transmit

direction prevents distortion of line signal and sidetone

• Symmetrical high-impedance inputs (64 kΩ) for

dynamic, magnetic or piezo-electric microphones

• Asymmetrical high-impedance input (32 kΩ) for electret

microphones

• DTMF signal input

• Confidence tone in the earpiece during DTMF dialling

• Mute input for disabling speech during pulse or DTMF

dialling

• Power-down input for improved performance during

pulse dial or register recall (flash)

• Receiving amplifier for magnetic, dynamic or

piezo-electric earpieces

• Large amplification setting ranges on microphone and

earpiece amplifiers

• Line loss compensation (line current dependent) for

microphone and earpiece amplifiers (not used for DTMF

amplifier)

• Gain control curve adaptable to exchange supply

• Automatic disabling of the DTMF amplifier in

extremely-low voltage conditions

• Microphone MUTE function available with switch

March 1994

2

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