L3240B1

更新时间： 2024-11-10 22:31:51

品牌	Logo	应用领域
意法半导体 - STMICROELECTRONICS		/
页数	文件大小	规格书
6页	126K
描述
ELETRONIC TWO-TONE RINGER

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L3240B1 数据手册

L3240

ELETRONIC 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

COMPLEMENTARY OUTPUT CONFIGURA-

TION

Minidip

SO8

ORDERING NUMBERS : L3240B1 (Minidip)

L3240D1 (SO8)

DESCRIPTION

L3240 is a monolithic integratedcircuit designed to

replace the mechanical bell in telephone sets, in

connectionwith an electroacousticalconverter.The

device can drive either directly a piezo ceramic con-

verter (buzzer) or a small loudspeaker. In this case

a transformer is needed. The two tone frequencies

generatedare switched by an internaloscillator in a

fast sequenceand made audibleacross outputam-

plifiers inthe transducer; bothtonefrequenciesand

the switching frequencycan be externallyadjusted.

PIN CONNECTION ( top view)

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

the correct operation of the devices.

The output bridge configurationallows to use a high

impedancetransducerwith acoustical results much

better than in a single ended configuration.

The two outputs can also be connected inde-

pendently to different converters or actua-

tors (acoustical, opto, logic).

1/6

June 1993

12 3 4 5 6

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