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U3810BM

Multi Standard Feature Phone Integrated Circuit

Temic Semiconductors 

TELEFUNKEN Semiconductors

U3810BM

Multi Standard Feature Phone Integrated Circuit

Description

The U3810BM multi-standard feature phone circuit is

designed to be used with a microcontroller using a 2-wire

serial bus. It performs all speech and line interface

functions required in an electronic telephone set: the

ringing function with switching regulator and melody

generator, the DTMF dialling, the loudhearing with

antilarsen and antidistortion systems, a power supply, a

clock and a reset for the microcontroller. Transmit, receive

and loudhearing gains control / AGC range / DTMF

frequencies, pre-emphasis and level / melody generator,

and mutes are programmable through the serial bus.

Block diagramm

Speech

circuit

LH

Loudhearing

and

Tone ringing

DTMF

dialer

Tone

ringer

Figure 1

MC

with

EEPROM

93 7600 e

Applications

D Feature phones

D Answering machines

D Fax machines

Rev. A1: 19.01.1996

Benefits

D Complete system integration of analog signal

processing and digital control circuitry

D One IC for various PTT standards, e.g. programmable

specification via mC

D Only three low-cost transducers needed (instead of

four)

1 (31)

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