U3810BM datasheet(2/31 Pages) TEMIC

2 / 31 page

TELEFUNKEN Semiconductors

U3810BM

Rev. A1: 19.01.1996

2 (31)

Features

D Slope of DC characteristics adjustable by an external

resistor

D Gain of transmit and receive amplifiers automatically

adjusted by line length control

D Regulation range adjustable by the serial bus

D Possibility of fixed gain (PABX)

D Sidetone balancing system adjustable with line length

or by the serial bus

D Dynamic

impedance

adjustable

external

components

D Stabilized power supply for peripherals

D Confidence level during dialling

D +6 dB possibility on second stage transmit gain

D Transmit and receive gains adjustable by serial bus

D Extra transmit input for handsfree and answering

machine purpose

D +6 dB possibility on receive gain

D Receive amplifier for dynamic or piezo-electric

earpieces

D Extra receive output for handsfree purpose

D High impedance microphone inputs suitable for

dynamic,

magnetic,

piezo-electric

electret

microphone

D Distortion of line signal and sidetone prevented by

dynamic

range

limitation

transmission

(anti-clipping)

D Squelch system in transmission prevents “room noise”

are being transmitted, and improves anti-larsen

efficiency (can be inhibited).

D Loudhearing gain programmable in eight steps of 4 dB,

using the serial bus, or linearly adjusted, using a

potentiometer

D Anti-larsen system efficiency is increased when

inhibiting squelch

D Loudhearing anti-distortion system by automatic gain

control versus available current and voltage

D Switching regulator in ringing phase

D Input ringing detection, threshold and impedance

adjustable with external resistors

D Ringing zero crossing information for external

microprocessor

D Ringing programmable gain in eight steps of 4 dB using

the serial bus

D Melody generator, with 30 frequencies in steps of semi

tones, driven by serial bus

D Internal speed-up circuit permits a faster charge of

VDD and VCC capacitor

D DTMF dialer driven by serial bus, in particular level

and pre-emphasis adjustment

D Ability to transmit a confidence tone in speech mode

using melody generator frequencies

D Five independent mutes driven by serial bus (two in

transmission, two in reception, one for the transmit /

receive loop)

D Standard low-cost ceramic 455 kHz / clock output for

the microcontroller

D Extra loudhearing input for answering machines,

handsfree and base station of phones cordless with

loudhearing

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