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
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