DESCRIPTION

The TEA7088A is a Telephone Analog Front End device, TAFE, which integrates the three basic functionsof a standard telephoneset :

- Speech network,

- DTMF generator,

- Ringer generator on buzzer.

A complete telephone set can be designed using TEA7088A associated with a low cost microcontroller.

■ RING

- GENERATION OF 8 MELODY TONES

(Including the 3 German Melody Tones)

- 4 STEPS DIGITAL CONTROL ON THE AM PLIFIER OUTPUT LEVEL

■ SPEECH

- TRANSMIT GAIN EXTERNALLY ADJUSTABLE

- RECEIVING GAIN EXTERNALLY ADJUSTABLE

- AGC SLOPE EXTERNALLY PROGRAMMABLE

- SOFTCLIPPING ON SENDING CHANNEL

- RECEIVE AMPLIFIER FOR PIEZO OR ELECTRODYNAMIC TRANSDUCER

- +6dB MODE ON RECEIVE CHANNEL

- LINE POWER MANAGEMENT

■ DIALING

- DTMF GENERATOR

- LOW DC MASK DURING MAKE PERIOD THROUGH MICROCONTROLLER SERIAL BUS INTERFACE

■ MICROCONTROLLER INTERFACE

- 1.79MHzCLOCK OR 3.58MHz OSCILLATOR INPUT

■ MICROCONTROLLER POWER SUPPLY

■ MICROCONTROLLER CONTROL INTERFACE INCLUDING SERIAL BUS

■ LINE CURRENT EXTRACTOR FOR SUPPLY OF EXTERNAL PERIPHERALS