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
Serial bus
Loudhearing
LH
and
Tone ringing
DTMF
dialer
Tone
ringer
MC
with
EEPROM
93 7600 e
Figure 1
Applications
D
Feature phones
D
Answering machines
D
Fax machines
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
m
C
D
Only three low-cost transducers needed (instead of
four)
Rev. A1: 19.01.1996
1 (31)
TEMIC [ TEMIC SEMICONDUCTORS ]
