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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 kW) for dynamic, magnetic or piezo-electric microphones Asymmetrical high impedance input (32...

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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 inpu...

TEA1112A Data Sheet

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TEA1112A
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Product Details

Description



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 kW) for dynamic, magnetic or piezo-electric microphones
Asymmetrical high impedance input (32 kW) 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.


Pinout

Connection Diagram




Specifications

SYMBOL PARAMETER CONDITIONS MIN. MAX. UNIT
VLN positive continuous line voltage   VEE - 0.4 +12 V
repetitive line voltage during switch-on or line interruption   VEE  - 0.4 +13.2 V
Vn(max) maximum voltage on pins REG, SLPE, IR and AGC   VEE  - 0.4 VLN + 0.4 V
maximum voltage on all other pins except VDD   VEE  - 0.4 Vcc + 0.4 V
Iline maximum line current
RSLPE= 20 ; see
Figs 12 and 13		 - 140

mA

Ptot

 total power dissipation
TEA1112; TEA1112A
TEA1112T; TEA1112AT		 Tamb = 75 °C;
see Figs 12 and 13
-
-
625
416
mW
mW
Tstg IC storage temperature   -40 +125 °C
Tamb operating ambient temperature   -25 +75 °C



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.




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