TELEFUNKEN Semiconductors
U3810BM
Multi Standard Feature Phone Integrated Circuit
Description
The U3810BM multi-standa...
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 mC
D Only three low-cost transducers needed (instead of
four)
Rev. A1: 19.01.1996
1 (31)
U3810BM
Features
D Slope of DC characteristics adjustable by an external
resistor
TELEFUNKEN Semiconductors
D Loudhearing gain programmable in eight steps of 4 dB,
using the serial bus, or linearly adjusted, using a potentiometer
D Gain of transmit and receive amplifiers automatically
adjusted by line length control
D Anti-larsen s...