LS1240, LS1240A, LS1240AD Selling Leads, Datasheet
MFG:ST Package Cooled:8DIP D/C:04+
LS1240, LS1240A, LS1240AD Datasheet download
Part Number: LS1240
MFG: ST
Package Cooled: 8DIP
D/C: 04+
LS1240, LS1240A, LS1240AD
- Table of contents:
Info of LS1240
Info of LS1240A
Info of LS1240AD
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About LS1240
PDF/DataSheet Download
Datasheet: LS1240
File Size: 40927 KB
Manufacturer: STMICROELECTRONICS [STMicroelectronics]
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About LS1240A
PDF/DataSheet Download
Datasheet: LS1240A
File Size: 289589 KB
Manufacturer: STMICROELECTRONICS [STMicroelectronics]
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About LS1240AD1
PDF/DataSheet Download
Datasheet: LS1240AD1
File Size: 289589 KB
Manufacturer: STMICROELECTRONICS [STMicroelectronics]
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LS1240A General Description
LS1240A is a monolithic integrated circuit designed to replace the mechanical bell in telephone sets in connection with an electro-acoustical converter. It can drive directly a piezoceramic converter (buzzer) or a dynamic loudspeaker.
The output current capability of LS1240A is higher than standard ringer. For driving a dynamic loudspeaker LS1240A can simply use a decoupling capacitor, thus eliminating the usual transformer.
No current limitation is provided on the output stage of LS1240A, so a minimum load DC of 50 W is adviced, in series with a proper capacitor.
The two tone frequencies generated are switched by an internal oscillator in a fast sequence and made audible across an output amplifier in the loudspeaker, both tone frequencies and the switching frequency can be externally adjusted.
The supply voltage is obtained from the AC ring signal and the circuit is designed so that noise on the line or variations of the ringing signal cannot affect correct operation of the device.
The output current capability of LS1240A is higher than standard ringer. For driving a dynamic loudspeaker LS1240A can simply use a decoupling capacitor, thus eliminating the usual transformer.
No current limitation is provided on the output stage of LS1240A, so a minimum load DC of 50 W is adviced, in series with a proper capacitor.
The two tone frequencies generated are switched by an internal oscillator in a fast sequence and made audible across an output amplifier in the loudspeaker, both tone frequencies and the switching frequency can be externally adjusted.
The supply voltage is obtained from the AC ring signal and the circuit is designed so that noise on the line or variations of the ringing signal cannot affect correct operation of the device.
LS1240A Maximum Ratings
|
Symbol |
Parameter |
Value |
Unit |
|
VAB |
Calling Voltage (f = 50 Hz) Continuous |
120 |
Vrms |
|
VAB |
Calling Voltage (f = 50 Hz) 5s ON/10s OFF |
200 |
Vrms |
|
DC |
Supply Current |
30 |
mA |
|
Top |
Operating Temperature |
0 to + 70 |
|
|
Tstg |
Storage and Junction Temperature |
-65 to +150 |
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