TELEFUNKEN Semiconductors
U4078B
Tone Ringer Interface with DC/DC Converter
Description
The tone ringer interface with dc/dc converter U4078B is
an integrated circuit realized in bipolar technology, which
allows high efficient power transfer. Galvanic separation
takes place at Pin 5 either with inductive or opto-coupler
mode.
Features
D
Suitable for the specification:
FTZ, 1TR2 and ETR2
Benefits
D
High efficient power transfer
D
D
D
D
Rectifier bridge
Z-diode
Amplitude detection
Detection of ringing signal i.e.,
sine-, triangle-, or rectangular (tone ringing) signal
D
High-voltage bipolar technology
D
Compact surface mount package (SO8)
22
m
F
1.5 k
W
V
B
1
2
Hysteresis and
power supply
8
7
GND
3
TH
47 pF
92 7460 e
output
b
1
a
a
b
38 kHz
Pulse 5
shaping
ST
m
C supply
2f
m
F
6
OSC
180 k
W
4
MS
Figure 1. Block diagram with external circuit
14.04.94
1
TEMIC [ TEMIC SEMICONDUCTORS ]
