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U3750BM, U3750BMACP, U3760

Table of contents:
Info of U3750BM
Info of U3750BMACP
Info of U3760

U3750BM, U3750BMACP, U3760 Selling Leads, Datasheet

MFG:PLCC-44P Package Cooled:PLCC44 D/C:05+

U3750BM, U3750BMACP, U3760 Datasheet download

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Part Number: U3750BM

MFG: PLCC-44P

Package Cooled: PLCC44

D/C: 05+

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U3750BM General Description

TELEFUNKEN microelectronic's 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 interface with the possibility to interface with an external microcontroller using the internal serial bus, and a power supply for peripherals.

U3750BM Maximum Ratings

Parameters	Symbol	Value	Unit
DC line voltage Pin 36	V_IR	35	V
DC line voltage Pin 36	I_R	30	mA
Conversation line voltage Pin 12	V_L	15	V
Pulse duration, t = 20 ms	V_L	17	V
Conversation line current Pin 12	I_L	150	mA
Power dissipation, T_amb = 55°C	P_tot	1	W
Junction temperature	T_j	125
Ambient temperature range	T_amb	25 to +55
Storage temperature range	T_stg	55 to +155

U3750BM Features

· Adjustable dc slope characteristic
· Adjustable automatic line length receiving and sending gain control (not used in DTMF) with the possibility of fixed gain (PABX)
· Adjustable dynamic impedance
· Stabilized power supply for peripherals
· Confidence level during pulse and DTMF dialling
· Receiving amplifier for dynamic or piezo-electric ear
pieces
· High-impedance microphone inputs (80 k in symmetrical and 40 k in asymmetrical) suitable for dynamic, magnetic, piezo-electric or electret microphone · Dynamic limiting in sending (anticlipping) prevents distortion of line signal and sidetone
· Ringing balanced output in HVMOS for higher power capability
· Four ringing tones adjustable without external components
· Internal speed up circuit permits a faster charge of V_CC and VRAM capacitors
· Logic bounce elimination
· Pulse dialling 66/33 or 60/40 or DTMF dialling selectable by programming pin
· Adjustable flashing duration
· Pause function
· Confidence tone (440 Hz)
· Last number redial up to 23 digits
· Standard low-cost ceramic 455 kHz
· Binary data input in serial mode
· Test-mode capability

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