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LS1240 датащи(PDF) 1 Page - Wing Shing Computer Components

номер детали LS1240
подробное описание детали  Electronic Two-Tone Ringer
Download  4 Pages
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производитель  WINGS [Wing Shing Computer Components]
домашняя страница  http://www.wingshing.com/en
Logo WINGS - Wing Shing Computer Components

LS1240 датащи(HTML) 1 Page - Wing Shing Computer Components

  LS1240 Datasheet HTML 1Page - Wing Shing Computer Components LS1240 Datasheet HTML 2Page - Wing Shing Computer Components LS1240 Datasheet HTML 3Page - Wing Shing Computer Components LS1240 Datasheet HTML 4Page - Wing Shing Computer Components  
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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
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
Ω 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.
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.
SO8
Minidip
ORDERING NUMBERS
Minidip
SO8
LS1240A
LS1240AD1
PIN CONNECTION (top view)
Wing Shing Computer Components Co., (H.K.)Ltd.
Tel:(852)2341 9276
Fax:(852)2797 8153
Homepage: http://www.wingshing.com
E-mail:
wsccltd@hkstar.com
Electronic Two-Tone Ringer
LS1240A


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