TEA7091

Features:

SPEECH
`DC LINE CURRENT RANGE FROM 6 TO 110mA
`Tx AND Rx GAIN EXTERNALLY ADJUSTABLE
`AGC IN Tx AND Rx EXTERNALLY PROGRAMMABLE
`AGC DISABLEABLE THROUGH MICROCONTROLLER BUS
`SINGLE/DOUBLE SIDETONE NETWORK SOFTWARE PROGRAMMABLE
`SOFTCLIPPING ON Tx CHANNEL
`SQUELCH TO REDUCE Tx NOISE ENVIROMENT AND TO IMPROVE HOWLING IMMUNITY IN LOUDHEARING MODE
`RECEIVING AMPLIFIER FOR PIEZO OR ELECTRODYNAMIC TRANSDUCERS
`+6dB MODE ON Rx CHANNEL (SELECTABLE THROUGH MICROCONTROLLER BUS)
`6dB MODE ON Tx CHANNEL (SELECTABLE THROUGH MICROCONTROLLER BUS)
`FREQUENCY GENERATOR FOR WAITING MELODY
`ERROR BEEP GENERATOR HOLD LINE CURRENT DETECTOR FOR TRANSFER/ AUTO RELEASE


Pinout




Specifications

Symbol	Parameter	Value	Unit
Top	Operating Temperature	25 to +70
Tstg	Storage Temperature	55 to +150
VLM	Supply Voltage (pin 3)	12	V
ILM	Supply Current	150	mA
VREGM	CMOS part supply (Pin 8)	6	V
Tj	Junction Temperature	25 to +150

Description

The TEA7091 is a Telephone set Analog Front End (TAFE) interface intended for use in conjunction with a microcontroller.
In this configuration the TEA7091 provides a worldwide mid-range telephone set with loudhearing on board and melody ringer on loudspeaker.

Repertory dialer (memory on MCU) and various features (HOLD, Tone/Pulse, Flash, MUTE, adjustable Ringer and Loudhearing levels..) are programmable by MCU.

Also high-range telephone set can be built around TEA7091 by adding Handsfree controller (TEA7540), Electronic Hook Switch and upgraded MCU (ST family) with LCD driver.

The concept using TAFE + Microcontroller is called BICHIP approach.

The benefits of this concept are:

Saving of external components.

Easy upgrade of the features (extra memories, LCD driver, Answering machine or Cordless interface..) through microcontroller.

Replacement of configuration switches (PABX /Public, Tone/Pulse...) by EEPROM settings.

This also induces reliability and cost improvement.