DESCRIPTION

The TEA7089A 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 TEA7089A 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

- TRANSMITGAINEXTERNALLYADJUSTABLE

- RECEIVINGGAINEXTERNALLYADJUSTABLE

- AGCSLOPEEXTERNALLYPROGRAMMABLE

- 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 3.58MHzOSCILLATOR INPUT

. MICROCONTROLLER POWER SUPPLY

. MICROCONTROLLER CONTROL INTERFACE INCLUDING SERIAL BUS

. LINE CURRENT EXTRACTOR FOR SUPPLY OF EXTERNAL PERIPHERALS