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