U4092B

Features:

DC characteristic adjustable
Transmit and receive gain adjustable
Symmetrical input of microphone amplifier

Anti-clipping in transmit direction
Automatic line loss compensation
Built-in ear protection
DTMF and MUTE input
Adjustable sidetone suppression independent of sending and receiving amplification
Integrated amplifier for loudhearing operation
Anti-clipping for loudspeaker amplifier
Improved acoustical feedback suppression
Power down
Voice switch
Tone ringer interface with dc/dc converter
Zero crossing detection
Common speaker for loudhearing and tone ringer
Supply voltages for all functional blocks of a subscriber set
Integrated transistor for short circuiting the line voltage
Answering machine interface
Operation possible from 10 mA line currents


Application

Feature phone, answering machine, fax machine, speaker phone


Pinout




Specifications

Parameters	Symbol	Value	Unit
Line current	IL	140	mA
DC line voltage	VL	12	V
Maximum input current     Pin17	IRING	15	mA
Junction temperature	Tj	+125	°C
Ambient temperature	Tamb	25 to +75	°C
Storage temperature	Tstg	55 to +150	°C
Total power dissipation Tamb = 60°C	Ptot	1	W

Description

The c controlled telephone circuit U4092B is a linear integrated circuit for use in feature phones, answering machines and fax machines. It contains the speech circuit, tone ringer interface with dc/dc converter, sidetone equivalent and ear protection rectifiers. The U4092B is line powered and contains all components necessary for amplification of signals and adaptation to the line.

An integrated voice switch with loudspeaker amplifier U4092B allows loudhearing or handsfree operation. With an anti-feedback function, acoustical feedback during loudhearing can be reduced significantly. The generated supply voltage of U4092B is suitable for a wide range of peripheral circuits.