TEA1112A View Datasheet(PDF) - Philips Electronics

Part Name

Description

Manufacturer

TEA1112A

Low voltage versatile telephone transmission circuits with dialler interface

Philips Electronics 

Philips Semiconductors

Low voltage versatile telephone

transmission circuits with dialler interface

Product specification

TEA1112; TEA1112A

FEATURES

• Low DC line voltage; operates down to 1.6 V (excluding

polarity guard)

• Voltage regulator with adjustable DC voltage

• Provides a supply for external circuits

• Symmetrical high impedance inputs (64 kΩ) for

dynamic, magnetic or piezo-electric microphones

• Asymmetrical high impedance input (32 kΩ) for electret

microphones

• DTMF input with confidence tone

• Mute input for pulse or DTMF dialling (MUTE for

TEA1112 and MUTE for TEA1112A)

• Receiving amplifier for dynamic, magnetic or

piezo-electric earpieces

• AGC line loss compensation for microphone and

earpiece amplifiers

• LED on-hook/off-hook status indication

• Microphone mute function (MMUTE for TEA1112 and

MMUTE for TEA1112A).

APPLICATION

• Line powered telephone sets, cordless telephones, fax

machines and answering machines.

GENERAL DESCRIPTION

The TEA1112; TEA1112A are bipolar integrated circuits

that perform all speech and line interface functions

required in fully electronic telephone sets. They perform

electronic switching between speech and dialling. The ICs

operate at a line voltage down to 1.6 V DC (with reduced

performance) to facilitate the use of telephone sets

connected in parallel.

A current (proportional to the line current and internally

limited to a typical value of 19.5 mA) is available to drive

an LED which indicates the on-hook/off-hook status.

The microphone amplifier can be disabled during speech

condition by means of a microphone mute function.

All statements and values refer to all versions unless

otherwise specified.

QUICK REFERENCE DATA

Iline = 15 mA; VEE = 0 V; RSLPE = 20 Ω; AGC pin connected to VEE; Zline = 600 Ω; f = 1 kHz; Tamb = 25 °C;

unless otherwise specified.

SYMBOL

Iline

ILED(max)

VLN

ICC

VCC

Gvtrx

∆Gvtrx

∆Gvtxm

PARAMETER

line current operating range

maximum supply current available

DC line voltage

internal current consumption

supply voltage for peripherals

typical voltage gain range

microphone amplifier

receiving amplifier

gain control range for microphone and

receiving amplifiers with respect to

Iline = 15 mA

microphone amplifier gain reduction

CONDITIONS

normal operation

with reduced performance

Iline = 18 mA

Iline > 76 mA

VCC = 2.9 V

Ip = 0 mA

MIN.

11

1

−

−

3.35

−

−

TYP.

−

−

0.5

19.5

3.65

1.15

2.9

MAX.

140

11

−

−

3.95

1.4

−

UNIT

mA

mA

mA

mA

V

mA

V

VMIC = 2 mV (RMS)

VIR = 6 mV (RMS)

Iline = 85 mA

38.8 −

19.2 −

−

5.8

51.8 dB

31.2 dB

−

dB

−

80 −

dB

1997 Mar 26

2

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