LS1240 View Datasheet(PDF) - Contek Microelectronics

Part Name

Description

Manufacturer

LS1240

ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER

Contek Microelectronics 

LS1240A

LINEAR INTEGRATED CIRCUIT

ELECTRONIC TONE RINGER WITH

BUILT-IN BRIDGE RECTIFIER

DESCRIPTION

The Contek LS1240A is a monolithic integrated circuit,

designed to be as a telephone ringer . It can drive directly a

piezo-ceramic converter (buzzer). The output current

capacitity of Contek LS1240A is higher than Contek LS1240, For

driving a dynamic loudspeaker , Contek LS1240A needs only a

decoupling capacitor.

FEATURES

*Low current consumption, in order to allow the parallel

operation of 4 devices.

*Integrated rectifier bridge with zener diodes to protect

against over voltage.

*Little external circuitry.

*Tone and switching frequencies adjustable by external

components.

*Integrated voltage and current hysteresis.

DIP-8

TEST CIRCUIT

1 mF

2.2k W

8

5

V AB

7

10 m F

f1= 27200

R1(k W )

Contek

LS1240A

RL

Vout

1

23

4

C1

100nF

R1

14k W

f2=0.725f1

f ( SWEEP

)=C17(5n0F)

Contek Microelectronics Co.,Ltd.

1

CONTEK

http://www.contek-ic.com E-mail:sales@contek-ic.com

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