SL2418D 데이터 시트보기 (PDF) - System Logic Semiconductor

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SL2418D

Telephone Tone Ringer with Bridge Diode

System Logic Semiconductor 

SL2418

AC CHARACTERISTICS

Symbol

Parameter

Output Frequencies

fH1

fH1

fH2

fH2

fH1 Range

fL

Sweep Frequency

Test Conditions

VCC = 26 V, R1 = 14 KΩ

VCC = 0 V

VCC = 6 V

R1 = 27 KΩ to 1.7 KΩ

R1 = 14 KΩ, C1 = 100 nF

Guaranteed Limits

Unit

Min Typ Max

2300

Hz

1700

Hz

0.1

15

KHz

10

Hz

TEST AND APPLICATION CIRCUIT

f1 = 3.22 •104 / R1 (KΩ); f2 = 5/7 f1; fsweep = 1000 / C1(nF)

DESCRIPTION

The SL2418 tone ringer derives its power supply by rectifying the AC ringing signal. It uses this power to

activate two tone generators. The two tone frequencies generated are switched by internal oscillator in a fast

sequence and made audible across an output amplifier in the loudspeaker; both tone frequencies and the

switching frequency can be externally adjusted.

The device can drive either directly a piezo ceramic converter (buzzer) or small loudspeaker. In case of using

a loud-speaker, a transformer is needed.

An internal shunt voltage regulator provides DC voltage to the output stage, low frequency oscillator, and

high frequency oscillator. To protect the IC from telephone line transients, a zener Diode is included.

SLS

System Logic

Semiconductor

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