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LS1240

Part Number	LS1240
Manufacturer	STMicroelectronics
Description	ELECTRONIC TWO - TONE RINGER
Published	Apr 25, 2005
Detailed Description	® LS1240A ELECTRONIC TWO - TONE RINGER . . . . . LOW CURRENT CONSUMPTION, IN ORDER TO ALLOW THE PARALLEL OPERATION OF...
Datasheet	LS1240 PDF File

Overview

® LS1240A ELECTRONIC TWO - TONE RINGER .
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LOW CURRENT CONSUMPTION, IN ORDER TO ALLOW THE PARALLEL OPERATION OF 4 DEVICES INTEGRATED RECTIFIER BRIDGE WITH ZENER DIODES TO PROTECT AGAINST OVERVOLTAGES LITTLE EXTERNAL CIRCUITRY TONE AND SWITCHING FREQUENCIES ADJUSTABLE BY EXTERNAL COMPONENTS INTEGRATED VOLTAGE AND CURRENT HYSTERESIS Minidip 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 Ω is adviced, in series with a proper capacitor.
The two tone frequencies generated are switched by an internal osc...

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