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E-LS1240AD1 View Datasheet(PDF) - STMicroelectronics

Part NameDescriptionManufacturer
E-LS1240AD1 Electronic two-tone ringer ST-Microelectronics
STMicroelectronics ST-Microelectronics
E-LS1240AD1 Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
Electronic two-tone ringer
Low current consumption, in order to allow the
parallel operation of 4 devices
Integrated rectifier bridge with zener diodes to
protect against over voltages little external
Tone and switching frequencies adjustable by
external components
) Integrated voltage and current hysteresis
ct(s Description
du LS1240 is a monolithic integrated circuit designed
ro to replace the mechanical bell in telephone sets in
connection with an electro-acoustical converter. It
P can drive directly a piezoceramic converter
te (buzzer) or a dynamic loudspeaker.
le The output current capability of LS1240 is higher
so than the one of a standard ringer. To drive a
b dynamic loudspeaker LS1240 can simply use a
O decoupling capacitor, thus eliminating the usual
- transformer.
t(s) No current limitation is provided on the output
stage of LS1240, so a minimum load DC of 50
c is advised, in series with a proper capacitor.
Obsolete Produ Pin connection (top view)
The two tone frequencies generated are switched
by an internal oscillator in a fast sequence and
are 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.
August 2006
Rev 2
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