STMicroelectronics TEA7089A
The TEA7089A is a Telephone Analog Front End device, TAFE, which integrates the three basic functions of a standard telephone set : - Speech network, - DTMF generator, - Ringer generator on buzzer. The TEA7089A is able to supply the necessary current to an external speakerphone circuit TEA7540 and loudspea ker amplifier TEA7532 without any additional circuitry.| Part No. | TEA7089A |
|---|---|
| Datasheet | TEA7089A Download |
| Manufacturer |  STMicroelectronics |
| Description | LOW-RANGE PHONE DEDICATED CHIP |
| Buy | Stock & Price |
DESCRIPTION
A complete telephone set can be designed using TEA7089A associated with a low cost microcontroller. June 1998 VCC GND IVLS VS RES VRING BUZ 7089A-01.EPS VL VMC GREC EAR+ EAR- 1/17 TEA7089A SPEECH The speech network includes : - a low noise transmit channel suitable for any kind of microphone transducer. Softclipping on transmit line signal is provided by the chip. - a low noise receive channel with symmetrical outputs to be compatible with both piezoceramic and electrodynamic earpiece. An additional 6dB gain can be inserted in the receive channel through software control. - a line length gain control (AGC) with starting point of gain regulation fixed at 25mAline current ; slope of gain regulationis externallyadjustablewith one resistor.AGC can be removedby hardware (maximum gain flat) or by software (-2dB flat). The phone impedance and sidetone can be tuned through external networks. DTMF GENERATOR The onboard DTMF generator fullfils the CEPT requirements with an external single pole filter.
