U3810BM Datasheet, PDF (2/31 Pages) TEMIC Semiconductors – Multi Standard Feature Phone Integrated Circuit

U3810BM
TELEFUNKEN Semiconductors
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 by 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 or electret
microphone
D Distortion of line signal and sidetone prevented by
dynamic range limitation in 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
2 (31)
Rev. A1: 19.01.1996