Datasheet > LS1240

LS1240

更新时间： 2024-11-23 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

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LS1240 数据手册

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 Ω 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

12 3 4

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与LS1240相关器件

型号	品牌	获取价格	描述	数据表
LS1240A	STMICROELECTRONICS	获取价格	ELECTRONIC TWO - TONE RINGER
LS1240A	Wing Shing	获取价格	Electronic Two-Tone Ringer
LS1240A	UTC	获取价格	ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
LS1240A(8SOP)	UTC	获取价格	Telephone Circuit, PDSO8
LS1240A_15	UTC	获取价格	ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
LS1240A-D08-T	UTC	获取价格	ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
LS1240AD1	Wing Shing	获取价格	Electronic Two-Tone Ringer
LS1240AD1	STMICROELECTRONICS	获取价格	ELECTRONIC TWO - TONE RINGER
LS1240AG-D08-T	UTC	获取价格	ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
LS1240AG-S08-R	UTC	获取价格	ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER