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TEA1111A

Features: Low DC line voltage; operates down to 1.5 V (excluding voltage drop across external polarity guard) Line voltage regulator with adjustable DC voltage 3.25 V regulated strong supply point for peripheral circuits compatible with: Speech mode Ringer mode Trickle mode. Transmit stage wit...

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SeekIC No. : 004517258 Detail

TEA1111A: Features: Low DC line voltage; operates down to 1.5 V (excluding voltage drop across external polarity guard) Line voltage regulator with adjustable DC voltage 3.25 V regulated strong supply point ...

TEA1111A Data Sheet

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Part Number:
TEA1111A
Supply Ability:
5000

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Product Details

Description



Features:

Low DC line voltage; operates down to 1.5 V (excluding voltage drop across external polarity guard)
Line voltage regulator with adjustable DC voltage
3.25 V regulated strong supply point for peripheral circuits compatible with:
   Speech mode
   Ringer mode
   Trickle mode.
Transmit stage with:
   Microphone amplifier with symmetrical high impedance inputs
   DTMF amplifier with confidence tone on earpiece.
Receive stage with:
   Earpiece amplifier with adjustable gain and volume control.
MUTE input for pulse or DTMF dialling
AGC line loss compensation for microphone and earpiece
LED control output.


Application

Line powered telephone sets with LCD module
Cordless telephones
Fax machines
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
IDD maximum input current at pin VDD   - 75 mA
VCC supply voltage   VEE - 0.4 12 V
V MUTE , VVCI maximum voltage on pins MUTE and VCI   VEE - 0.4 VDD + 0.4 V
Vn(max) maximum voltage on all pins except
pins VDD, MUTE and VCI		   VEE - 0.4 VCC + 0.4 V
Iline line current RSLPE= 20 ;
see Figs 12		 - 140 mA
Ptot
 TEA1111AT total power dissipation Tamb = 75 °C;
see Figs 12 		- 416 mW
Tstg IC storage temperature   -40 +125 °C
Tamb operating ambient temperature   -25 +75 °C
Tj junction temperature   - +125 °C



Description

The TEA1111A is a bipolar integrated circuit that performs all speech and line interface functions required in fully electronic telephone sets. It performs electronic switching between speech and dialling. The IC operates at a line voltage down to 1.5 V DC (with reduced performance) to facilitate the use of telephone sets connected in parallel.

When the line current is high enough, a fixed amount of current is derived from the LN pin in order to create a strong supply point at pin VDD. The voltage at pin VDD is regulated to 3.25 V to supply peripherals such as dialler,LCD module and microcontroller.




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