IL2418 Datasheet, PDF (3/4 Pages) List of Unclassifed Manufacturers – Telephone Tone Ringer with Bridge Diode

IL2418
AC CHARACTERISTICS
Symbol
Parameter
Output Frequencies
f_H1
f_H1
f_H2
f_H2
f_H Range max
f_H Range min
f_L
Sweep Frequency
Test Conditions
V_CC = 26 V, R1 = 14 K
V_SCR = 0 V
V _SCR = 6 V
V_CC = 26 V, R1 = 1.7 K,
V_SCR = 0 V
V_CC = 26 V, R1 = 27 K,
V_SCR = 6.0 V
V_CC = 26 V, C₁ = 100 nF
Guaranteed Limits
Unit
Min
Max
1960
1420
14
2570
Hz
1840
Hz
KHz
0.11
KHz
7.0
13.0
Hz
TEST AND APPLICATION CIRCUIT
1 F, 250V_{AC 2.2 K}
R_a
TIP
C₂
R₂
TEL LINE
C₃
10 F
865
7 _IL2418
12 3 4
0.22 F
10K
10K
Piezo V_OUT
1300:8
RING
C₁
100nF
R₁
14K
VS
f₁ = 3.22 10⁴ / R₁ (K); f₂ = 5/7 f₁; f_sweep = 1000 / C₁(nF)
DESCRIPTION
The IL2418 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.
2011, March, Rev. 01