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LS1240 PDF预览

LS1240

更新时间: 2024-11-08 22:31:03
品牌 Logo 应用领域
永盛 - Wing Shing 光电二极管电子
页数 文件大小 规格书
4页 294K
描述
Electronic Two-Tone Ringer

LS1240 数据手册

 浏览型号LS1240的Datasheet PDF文件第2页浏览型号LS1240的Datasheet PDF文件第3页浏览型号LS1240的Datasheet PDF文件第4页 
LS1240A  
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  
OVERVOLTAGES  
.
.
.
LITTLE EXTERNAL CIRCUITRY  
TONE AND SWITCHING FREQUENCIES AD-  
JUSTABLE 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 (buzz-  
er)or a dynamic loudspeaker.  
SO8  
The output current capability of LS1240A is higher  
than standard ringer. For driving a dynamic loud-  
speaker LS1240A can simply use a decoupling ca-  
pacitor, thus eliminating the usual transformer.  
ORDERING NUMBERS  
No current limitation is provided on the output stage  
of LS1240A, so a minimum load DC of 50 is ad-  
viced, in series with a proper capacitor.  
Minidip  
SO8  
LS1240A  
LS1240AD1  
The two tone frequencies generated are switched  
by an internal oscillator in a fastsequence and made  
audible across an output amplifier in the loud-  
speaker, both tone frequencies and the switching  
frequency can be externally adjusted.  
The supply voltage is obtained from the AC ring sig-  
nal and the circuit is designed so that noise on the  
line or variations of the ringing signal cannot affect  
correct operation of the device.  
PIN CONNECTION (top view)  
Wing Shing Computer Components Co., (H.K.)Ltd.  
Homepage: http://www.wingshing.com  
Tel:(852)2341 9276 Fax:(852)2797 8153  
E-mail: wsccltd@hkstar.com  

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