LS1240 ( LS1240A RoHS)
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Kategori
Dorukan Stok No
DRK-1189-2
Fiyat
0,45 USD + KDV
Havale
16,90 TL
(%3,00 havale indirimi)
17,42 TL
Electronic Dual Tone Generator
( Two-Tone Ringer )
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 50R 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.
Features
• Low Current Consumption, in order to allow the parallel operation of 4 devices
• Integrated rectifier bridge with zener diodes to protect against overvoltage
• Little external circuitry
• Tone and switching frequencies adjustable by external components
• Integrated voltage and current hysteresis
Supply Voltage : 26V
Supply Current : 30mA
Short Circuit Current : 70mA
Operating Temp : -20 +70°C
Package : DIP8
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 50R 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.
Features
• Low Current Consumption, in order to allow the parallel operation of 4 devices
• Integrated rectifier bridge with zener diodes to protect against overvoltage
• Little external circuitry
• Tone and switching frequencies adjustable by external components
• Integrated voltage and current hysteresis
Supply Voltage : 26V
Supply Current : 30mA
Short Circuit Current : 70mA
Operating Temp : -20 +70°C
Package : DIP8
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