TEA7092TQ 데이터 시트보기 (PDF) - STMicroelectronics

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TEA7092TQ

TELEPHONE ANALOG FRONT END

STMicroelectronics 

TEA7092

TELEPHONE ANALOG FRONT END

..SPEECH

DC LINE CURRENT RANGE FROM 6 TO 120mA

EXTERNALLY ADJUSTABLE :

- Tx AND Rx GAIN

- MAXIMUM TRANSMIT LEVEL

- RETURN LOSS

- SIDETONE NETWORKS

.. - Tx AND Rx AGC (LINE CURRENT START UP

VALUE AND SLOPE)

SOFTCLIPPING ON Tx CHANNEL

SQUELCH ON Tx CHANNEL TO REDUCE NOISE

ENVIRONMENT AND TO IMPROVE HOWLING

IMMUNITY IN LOUDHEARING MODE

. RECEIVING AMPLIFIER FOR PIEZO AND

ELECTRODYNAMIC TRANSDUCERS

. FREQUENCY GENERATOR FOR WAITING

MELODY

. ERROR BEEP GENERATOR

. HOLD LINE CURRENT DETECTOR FOR

TRANSFER/AUTO RELEASE FEATURE

. PROGRAMMABLE BY MICROCONTROLLER

SERIAL BUS :

- -6dB ON Tx CHANNEL

- +6dB ON Rx CHANNEL

- AGC INHIBITION ON Tx AND Rx CHANNELS

FOR PABX USE

- SQUELCH INHIBITION

GROUP LISTENING / ON HOOK DIALING

. ANTI-HOWLING WITH ACOUSTIC FEED-

BACK SYSTEM COUPLED TO SQUELCH

. RING MELODY CONTROL AND ERROR

BEEP GENERATORS

. PROGRAMMABLE BY MICROCONTROLLER

SERIAL BUS :

- DIGITAL VOLUME CONTROL (7 STEPS OF

4dB EACH) AND OFF MODE

.HANDFREE INTERFACE

PINS AND SOFTWARE FACILITY FOR EASY

INTERCONNECTION WITH HANDSFREE

CONTROLLER I.C. LIKE TEA7540

.RING ON LOUDSPEAKER

EMBEDDED SWITCH MODE POWER SUP-

PLY DRIVER TO FEED THE LOUDSPEAKER

AMPLIFIER DURING RING MODE

. PROGRAMMABLE BY MICROCONTROLLER

SERIAL BUS :

- DIGITAL VOLUME CONTROL (15 STEPS OF

4dB EACH) AND OFF MODE

- RING FREQUENCY GENERATOR (MORE

THAN 200 FREQUENCIES AVAILABLE)

.DIALING

PROGRAMMABLE BY MICROCONTROLLER

SERIAL BUS :

- DTMF GENERATOR

- 2V DC LINE VOLTAGE DURING THE MAKE

PERIOD IN PULSE MODE

MICROCONTROLLER INTERFACE

. 3.5V STABILIZED SUPPLY

. TWO WIRES SERIAL BUS INTERFACE

. RING INDICATOR

. PON LINE CURRENT INDICATOR

. RESET SIGNAL

. LINE CURRENT VARIATION INDICATOR

(FOR TRANSFER FEATURE)

. OSCILLATOR WITH STAND BY MODE

.CORDLESS AND ANSWERING MACHINE

INTERFACE

SELF BIASED LOUDSPEAKER AMPLIFIER

AND MICROCONTROLLER INTERFACE FOR

ANSWERING MACHINE

. SIGNAL INPUT AND OUTPUT INTERFACE

FOR CORDLESS

. VRMC SUPPLY CAN BE EXTERNALLY FORCED

TO 5V FOR EASY INTERFACE WITH A MAIN

POWERED MICROCONTROLLER

TQFP44

(Plastic Quad Flat Package)

ORDER CODES : TEA7092TQ - TEA7092TQT

July 1996

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