U4076B Datasheet, PDF (1/6 Pages) TEMIC Semiconductors – Three-Tone Ringer for Telephone Sets

Three-Tone Ringer for Telephone Sets
U4076B
Description
The three-tone ringing integrated circuit U4076B, in
conjunction with a piezo transducer or loudspeaker
replaces the normal electromechanical telephone bell. It
is operated with the ringing current from the exchange.
There is also a possibility of operating the IC with the dc
supply voltage, being developed for large operating
range. The integrated circuit is overload protected.
Features
D Three-tone ringing sequence with 800 Hz, 1067 Hz
and 1333 Hz
D Sequence frequency adjustable between 2.5 Hz and
25 Hz
D Adjustable volume
D Push-pull output stage
D Piezo transducer or loudspeaker connection
D Common input for frequency and call recognition
D Reduced pulse duration for electromagnetic
transducers
D Clock oscillator with ceramic resonator or LC series
cct possible
D Input protective diode
D On-chip rectifier bridge
D Protection circuit against ringing in a parallel circuit
Benefit
D Suitable for German Post Office Specification,
FTZ 121671 Pfl. 3, edition dated 24.03.82
2.2 kW ₇
a _{0.8 mF} (8)
~~
b
5
(6)
22 mF
4 (5)
6 (7)
600 kW 43 kW
4.7 nF
10 (11)
8 (9) 9 (10)
(15) 13
Ground: output signal
Open: output signal
Supply
Tone sequence
oscillator
Level
monitoring
Divider
32:1
Reset
a
Tone signal
generator
12
(13)
11
(12) 100 kW
log
RL 14
(16)
1
(1)
Frequency
Three
state
Frequency
monitoring
96 ms
127 ms
Reset
b
Divider
128:1
Divider
2:1
Divider
32:1
Divider
14:1
Figure 1. Block diagram and application circuit
2 (2)
Clock signal
generator
3 (3)
93 7792 e
455 kHz
Case: DIP14 or SO16-L (Pin connections for SO 16-L case in bracket)
TELEFUNKEN Semiconductors
1 (6)
Rev. A1, 15-May-96
Preliminary Information