Description

The U4074B is a monolithic integrated circuit that

contains all integral components of a ringing circuit for

telephone sets used in conjunction with a microcomputer.

The combination of a microcomputer and the U4074B

permits flexible programming of the ringing sequence

(melody), tone and volume control.

Features

 Suitable for specifications FTZ 1TR2 and ETR 2

 Rectifier bridge

 Z-diode

 Amplitude detection

 Supply voltage for microcomputer 3.5 @
1.5 mA

 DC operation possible

 Bridge push-pull output stage

 CMOS-compatible microcomputer interface

 2-bit log. volume adjustment

 High-voltage bipolar technology, 30 V

Benefits

µC controlled melody and volume

 Low number of external components