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