LS1240

更新时间： 2024-01-24 00:42:59

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		电信电路电话电路光电二极管电子
页数	文件大小	规格书
7页	500K
描述
ELECTRONIC TWO - TONE RINGER

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技术参数
数据手册

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LS1240 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	DIP	包装说明：	DIP, DIP8,.3
针数：	8	Reach Compliance Code：	compliant
HTS代码：	8542.39.00.01	风险等级：	5.56
Is Samacsys：	N	JESD-30 代码：	R-PDIP-T8
JESD-609代码：	e3	长度：	9.652 mm
功能数量：	1	端子数量：	8
最高工作温度：	70 °C	最低工作温度：	-40 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	DIP
封装等效代码：	DIP8,.3	封装形状：	RECTANGULAR
封装形式：	IN-LINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	26 V	认证状态：	Not Qualified
座面最大高度：	5.08 mm	子类别：	Telephone Circuits
标称供电电压：	26 V	表面贴装：	NO
电信集成电路类型：	TELEPHONE RINGER CIRCUIT	温度等级：	OTHER
端子面层：	Matte Tin (Sn)	端子形式：	THROUGH-HOLE
端子节距：	2.54 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	7.62 mm
Base Number Matches：	1

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)

1/7

July 1998

12 3 4 5 6 7

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