U4074B Datasheet, PDF (1/6 Pages) TEMIC Semiconductors – Tone Ringer Interface

Tone Ringer Interface
U4074B
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.
Ringing frequency detection takes place in the
microcomputer. The U4074B is responsible for the
interface to the line, driver stages for the piezoelectric
sound transducer, volume adjustment, amplitude
detection, voltage supply for the microcomputer and
other auxiliary functions.
Features
D Suitable for specifications FTZ 1TR2 and ETR 2
D Rectifier bridge
D Z-diode
D Amplitude detection
v D Supply voltage for microcomputer 3.5 @ 1.5 mA
D DC operation possible
D Bridge push-pull output stage
D CMOS-compatible microcomputer interface
D 2-bit log. volume adjustment
D High-voltage bipolar technology, 30 V
Benefits
m D C controlled melody and volume
D Low number of external components
22 mF
VB ₂₍₃₎
47 mF
130 kW
TH ^{3(4) VDD} 10 (12) 2f 4(5)
Ȁ ^m _a ^{0.8 F} ₍₁₎₁ a
2.2 kW
Ringing signal
b
Ȁ ₍₁₆₎₁₄ b
Control
VRef
Decoder and
DA converter
On/Off
2f
+VB
12(14)
O2
+VB
PIEZO
O1 ^Transducer
11(13)
93 7793 e
(15)13 GND 5(6)
6(7) (9)7 Mel
VDC ₈₍₁₀₎
9(11)
A1
A0
Volume
Figure 1. Block diagram and application circuit ( pin connections for SO16 in brackets )
TELEFUNKEN Semiconductors
1 (6)
Rev. A1, 06-May-96
Preliminary Information