Datasheet > UTC1240A

UTC1240A

更新时间： 2024-09-23 07:07:55

品牌	Logo	应用领域
友顺 - UTC		转换器电子机械电话
页数	文件大小	规格书
5页	63K
描述
ELECTRONIC DUAL-TONE RINGER,The UTC1240A are monolithic integrated circuits designed to replace the mechanical bell in telephone sets in connection with an electro-acoustical converter.

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UTC1240A 数据手册

UTC1240A

LINEAR INTEGRATED CIRCUIT

ELECTRONIC DUAL-TONE RINGER

DESCRIPTION

The UTC1240A are monolithic integrated circuits designed

to replace the mechanical bell in telephone sets in connection

with an electro-acoustical converter.Both devices can drive

directly a piezoceramic converter (buzzer).

The output of UTC1240A needs a decoupling capacitor.

No current limitation is provided on the output stage of

UTC1240A,so a minimum load DC of 50 ohms is adviced.

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

signal and the circuit is designed so that noise on the lin or

variations of the ringing signal cannot affect correct operation

of the device.

SOP-8

DIP-8

FEATURES

* Little external circuitry.

Low current consumption,in order to allow the parallel

* Tone and switching frequencies adjustable

by external components.

operation of 4 devices.

Integrated rectifier bridge with zener diodes to protect

against overvoltage.

* Intergrated voltage and current hysteresis

TEST CIRCUIT

2.2k

VAB

Vout

UTC1240A

14k

100nF

27200

R1(k

750

f1=

f2=0.725f1

f ( ^SWEEP)=

C1(nF)

YOUWANG ELECTRONICS CO.LTD

2005.08.25 V1.1

12 3 4 5

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