LS1240A datasheet(1/7 Pages) STMICROELECTRONICS

tên linh kiện	LS1240A

Giải thích chi tiết về linh kiện	Electronic two-tone ringer

PDF	7 Pages

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nhà sản xuất	STMICROELECTRONICS [STMicroelectronics]

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August 2006

Rev 2

1/9

9

LS1240

Electronic two-tone ringer

Features

■ Low current consumption, in order to allow the

parallel operation of 4 devices

■ Integrated rectifier bridge with zener diodes to

protect against over voltages little external

circuitry

■ Tone and switching frequencies adjustable by

external components

■ Integrated voltage and current hysteresis

Description

LS1240 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

(buzzer) or a dynamic loudspeaker.

The output current capability of LS1240 is higher

than the one of a standard ringer. To drive a

dynamic loudspeaker LS1240 can simply use a

decoupling capacitor, thus eliminating the usual

transformer.

No current limitation is provided on the output

stage of LS1240, so a minimum load DC of 50

Ω

is advised, in series with a proper capacitor.

The two tone frequencies generated are switched

by an internal oscillator in a fast sequence and

are made audible across an output amplifier in the

loudspeaker. Both tone frequencies and the

switching frequency can be externally adjusted.

The supply voltage is obtained from the AC ring

signal 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)

Minidip

SO8

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Số phần tương tự - LS1240A

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Wing Shing Computer Com...	LS1240A	282Kb / 4P	Electronic Two-Tone Ringer
Unisonic Technologies	LS1240A	223Kb / 5P	ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER
STMicroelectronics	LS1240A	245Kb / 9P	Electronic two-tone ringer 23-Aug-2006
STMicroelectronics	LS1240A	503Kb / 7P	ELECTRONIC TWO - TONE RINGER July 1998
Unisonic Technologies	LS1240A-D08-T	223Kb / 5P	ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER

More results

Mô tả tương tự - LS1240A

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
STMicroelectronics	L3240	123Kb / 6P	ELETRONIC TWO-TONE RINGER Jun-1993
Wing Shing Computer Com...	LS1240A	282Kb / 4P	Electronic Two-Tone Ringer
System Logic Semiconduc...	SL2411	50Kb / 6P	Tone Ringer
Daewoo Semiconductor	DBL5001	317Kb / 6P	TONE RINGER
Hynix Semiconductor	GL6840A	87Kb / 8P	Electronic Two Tone Ringer
	GL6850	37Kb / 3P	TWO TONE RINGER
	GL6851	35Kb / 3P	TWO TONE RINGER
STMicroelectronics	LS1241	175Kb / 3P	Electronic Two - Tone Ringer
STMicroelectronics	LS1240A	245Kb / 9P	Electronic two-tone ringer 23-Aug-2006
Hangzhou Youwang Electr...	UTC1240A	92Kb / 3P	ELECTRONIC DUAL-TONE RINGER

More results

LS1240A bảng dữ liệu(PDF) 1 Page - STMicroelectronics

LS1240A bảng dữ liệu(HTML) 1 Page - STMicroelectronics

Số phần tương tự - LS1240A

Mô tả tương tự - LS1240A

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