U4074B Datasheet

U4074B Tone Ringer Interface

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 cont.

Features

D Suitable for specifications FTZ 1TR2 and ETR 2 D Rectifier bridge D Z-diode D Amplitude detection D Supply voltage for microcomputer 3.5 @ D DC operation possible D Bridge push-pull output stage 22 mF V B 2(3) TH 130 kW 3(4) VDD 10 (12) 2f 4(5) 47mF D CMOS-compatible microcomputer interface D 2-bit log. volume adjustment D High-voltage bipolar technology, 30 V v 1.5 mA Benefits D mC controlled melody and volume D Low number of external components On/Off a 0.8mF (1)1 a 2.2 kW Ringing signal b (16)14 b Ȁ +V B 12(14) O2 Control VRef Ȁ 2f Decoder and DA converter +V B PIEZO O1 Transdu.