DataSheetWiki


LS1240 fiches techniques PDF

Wing Shing Computer Components - Electronic Two-Tone Ringer

Numéro de référence LS1240
Description Electronic Two-Tone Ringer
Fabricant Wing Shing Computer Components 
Logo Wing Shing Computer Components 





1 Page

No Preview Available !





LS1240 fiche technique
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.
Wing Shing Computer Components Co., (H.K.)Ltd.
Homepage: http://www.wingshing.com
Tel:(852)2341 9276 Fax:(852)2797 8153

PagesPages 4
Télécharger [ LS1240 ]


Fiche technique recommandé

No Description détaillée Fabricant
LS124 General Purpose Micross
Micross
LS1240 ELECTRONIC TWO - TONE RINGER STMicroelectronics
STMicroelectronics
LS1240 Electronic Two-Tone Ringer Wing Shing Computer Components
Wing Shing Computer Components
LS1240 Octal 3-STATE Bus Driver Fairchild Semiconductor
Fairchild Semiconductor

US18650VTC5A

Lithium-Ion Battery

Sony
Sony
TSPC106

PCI Bus Bridge Memory Controller

ATMEL
ATMEL
TP9380

NPN SILICON RF POWER TRANSISTOR

Advanced Semiconductor
Advanced Semiconductor


www.DataSheetWiki.com    |   2020   |   Contactez-nous  |   Recherche