sl2418 System Logic Semiconductor. co., sl2418 Datasheet - Page 3

• Manufacturer Part Number: sl2418
• Description: Telephone Tone Ringer With Bridge Diode
• Manufacturer: System Logic Semiconductor. co.

AC CHARACTERISTICS
DESCRIPTION
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.
a loud-speaker, a transformer is needed.
high frequency oscillator. To protect the IC from telephone line transients, a zener Diode is included.
Symbol
SLS
f
f
f
The SL2418 tone ringer derives its power supply by rectifying the AC ringing signal. It uses this power to
The device can drive either directly a piezo ceramic converter (buzzer) or small loudspeaker. In case of using
An internal shunt voltage regulator provides DC voltage to the output stage, low frequency oscillator, and
H1
H2
L
System Logic
Semiconductor
Output Frequencies
f
f
f
Sweep Frequency
H1
H2
H1
Range
Parameter
f
1
= 3.22 10
TEST AND APPLICATION CIRCUIT
4
/ R
V
V
V
R1 = 27 K to 1.7 K
R
1
CC
CC
CC
1
(K ); f
= 14 K , C
= 26 V, R1 = 14 K
= 0 V
= 6 V
Test Conditions
2
= 5/7 f
1
= 100 nF
1
; f
sweep
= 1000 / C
Min
0.1
1
Guaranteed Limits
(nF)
2300
1700
Typ
10
Max
15
SL2418
Unit
KHz
Hz
Hz
Hz