DataSheet8.cn


PDF ( 数据手册 , 数据表 ) LS1240AD1

零件编号 LS1240AD1
描述 ELECTRONIC TWO - TONE RINGER
制造商 STMicroelectronics
LOGO STMicroelectronics LOGO 


1 Page

No Preview Available !

LS1240AD1 数据手册, 描述, 功能
® 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.
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.
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.
The two tone frequencies generated are switched
by an internal oscillator in a fast sequence and made
audible across an output amplifier in the loud-
speaker, both tone frequencies and the switching
frequency can be externally adjusted.
PIN CONNECTION (top view)
SO8
ORDERING NUMBERS
Minidip
LS1240A
SO8
LS1240AD1
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.
July 1998
1/7












页数 7 页
下载[ LS1240AD1.PDF 数据手册 ]


分享链接

Link :

推荐数据表

零件编号描述制造商
LS1240AD1ELECTRONIC TWO - TONE RINGERSTMicroelectronics
STMicroelectronics
LS1240AD1Electronic Two-Tone RingerWing Shing Computer Components
Wing Shing Computer Components

零件编号描述制造商
STK15C88256-Kbit (32 K x 8) PowerStore nvSRAMCypress Semiconductor
Cypress Semiconductor
NJM4556DUAL HIGH CURRENT OPERATIONAL AMPLIFIERNew Japan Radio
New Japan Radio
EL1118-G5 PIN LONG CREEPAGE SOP PHOTOTRANSISTOR PHOTOCOUPLEREverlight
Everlight


DataSheet8.cn    |   2020   |  联系我们   |   搜索  |  Simemap