Three-Tone Ringer for Telephone Sets
U4076B
Three-Tone Ringer for Telephone Sets
Description
The three-tone ringing integrated circuit U4076B, in conjunction...
Description
U4076B
Three-Tone Ringer for Telephone Sets
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 Clock oscillator with ceramic resonator or LC series
cct possible
D Sequence frequency adjustable between 2.5 Hz and
25 Hz
D Input protective diode D On-chip rectifier bridge D Protection circuit against ringing in a parallel circuit
D D D D D
Adjustable volume Push-pull output stage Piezo transducer or loudspeaker connection Common input for frequency and call recognition Reduced pulse duration for electromagnetic transducers
Benefit
D Suitable for German Post Office Specification,
FTZ 121671 Pfl. 3, edition dated 24.03.82
22 m F 2.2 k W a ~ ~ b 0.8 m F 4 7 (5) 6 (7)
600 kW 10 (11)
43 kW 8 (9)
4.7 nF 9 (10) (15) 13
Ground: output signal Open: output signal
(8) Supply 5 (6) Level monitoring Tone sequence oscillator Divider 32:1 Tone signal generator 11 Reset a (12) 100 kW log 12 (13)
96 ms 127 ms Frequency monitoring Frequency Three state Divider 32:1 Divider 14:1 Clock signal generator 3 (3) 93 7792 e Reset b 2 (2) 455 kHz Divider 128:1 Divider 2:1
RL
14 (1...
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