ELECTRONIC TONE RINGER - UTC
Description
UNISONIC TECHNOLOGIES CO.
, LTD
LS1240A
LINEAR INTEGRATED CIRCUIT
ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
DESCRIPTION
The UTC LS1240A is monolithic integrated circuits and designed to be as a telephone ringer.
It can drive a piezo-ceramic converter(buzzer) directly.
The output current capacity of UTC LS1240A is higher than standard ringer.
For driving a dynamic loudspeaker, UTC LS1240A needs only a decoupling capacitor to replace the usual transformer in use.
FEATURES
* Low current consumption.
* Integrated rectifier bridge with zener diodes to overvoltage
Protection.
* Minimum external circuitry.
* Both frequencies of tone and switching are adjustable by external
components.
* Integrated voltage and current hysteresis.
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
LS1240AL-D08-T
LS1240AG-D08-T
- LS1240AG-S08-R
Package
DIP-8 SOP-8
Packing
Tube Tape Reel
MARKING
DIP-8
SOP-8
www.
unisonic.
com.
tw Copyright © 2015 Unisonic Technologies Co.
, Ltd
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LS1240A
PIN CONFIGURATION
LINE 1 GND 2 CSW 3
Ra 4
LINEAR INTEGRATED CIRCUIT
UTC LS1240A
8 LINE 7 Cr 6 NULL 5 OUT
PIN DESCRIPTION
PIN NO.
1 2 3 4 5 6 7 8
PIN NAME LINE GND Csw Ra OUT NULL Cr LINE
DESCRIPTION Connecting pin to B-wire Ground Sweep rate control capacitor Output frequency control resistor Buzzer Not connected Rectifier capacitor Connecting pin to A-wire
UNISONIC TECHNOLOGIES CO.
, LTD
www.
unisonic.
com.
tw
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QW-R108-002.
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LS1240A
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
TELEPHONE 1 LINE
2 GND
RECTIFIER IN BRIDGE IN
8 TELEPHONE LINE
7 RECTIFIER CAPACITOR
SWEEP RATE
3
CONTROL CAPACITOR
SWITCHING FREQUENCY GENERATOR
THRESHOLD CIRCUIT WITH
HYSTERESIS
6 N.
C.
4
OUTPUT FREQYENCY CONTROL RESISTOR
NONE FREQUENCY GENERATOR
OUTPUT STAGE
5 BUZZER
TEST CIRCUIT
UNISONIC TECHNOLOGIES CO.
, LTD
www.
unisonic.
com.
tw
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LS1240A
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIUM RATINGS
PARAMETER
SYMBOL
RATINGS
...
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