SL2418 datasheet(3/3 Pages) SLS

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SL2418

System Logic

Semiconductor

SLS

AC CHARACTERISTICS

Symbol

Parameter

Test Conditions

Guaranteed Limits

Unit

Min

Typ

Max

fH1

fH2

Output Frequencies

fH1

fH2

VCC = 26 V, R1 = 14 K

Ω

VCC = 0 V

VCC = 6 V

2300

1700

fH1 Range

R1 = 27 K

Ω to 1.7 KΩ

0.1

KHz

Sweep Frequency

R1 = 14 K

Ω, C

1 = 100 nF

TEST AND APPLICATION CIRCUIT

f1 = 3.22

•104 / R

1 (K

Ω); f

2 = 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.

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