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TELEFUNKEN Semiconductors

U3750BM

One Chip Telephone Circuit

Description

TELEFUNKEN microelectronic鈥檚 one chip telephone

circuit, U 3750 BM, is BICMOS integrated circuit that

performs all the speech and line interface functions

required in an electronic telephone set, the tone ringer, the

pulse and DTMF dialling with redial, a keyboard inter-

face with the possibility to interface with an external

microcontroller using the internal serial bus, and a power

supply for peripherals.

Features

D

Adjustable dc slope characteristic

D

Adjustable automatic line length receiving and send-

ing gain control (not used in DTMF) with the

possibility of fixed gain (PABX)

D

Four ringing tones adjustable without external

components

D

Internal speed up circuit permits a faster charge of

V

CC

and V

RAM

capacitors

D

D

D

D

Adjustable dynamic impedance

Stabilized power supply for peripherals

Confidence level during pulse and DTMF dialling

Receiving amplifier for dynamic or piezo-electric ear

pieces

D

Logic bounce elimination

D

Pulse dialling 66/33 or 60/40 or DTMF dialling select-

able by programming pin

D

Adjustable flashing duration

D

Pause function

D

Confidence tone (440 Hz)

D

Last number redial up to 23 digits

D

Standard low-cost ceramic 455 kHz

D

Binary data input in serial mode

D

Test-mode capability

D

High-impedance microphone inputs (80 k

W

in

symmetrical and 40 k

W

in asymmetrical) suitable for

dynamic, magnetic, piezo-electric or electret micro-

phone

distortion of line signal and sidetone

D

Dynamic limiting in sending (anticlipping) prevents

D

Ringing balanced output in HVMOS for higher power

capability

Benefits

D

Low number of external components

D

High quality through one chip solution

Rev. A1: 16.07.1996

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• 型號
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  英文版
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• U3750BM-CP
  英文版
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