SL2418N View Datasheet(PDF) - System Logic Semiconductor
Part Name
Description
Manufacturer
SL2418N Datasheet PDF : 3 Pages
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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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