IL2418 查看數據表（PDF） - Unspecified

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IL2418

Telephone Tone Ringer with Bridge Diode

Unspecified 

IL2418

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

1 F, 250VAC 2.2 K

Ra

TIP

C2

R2

TEL LINE

C3

10 F

86 5

7 IL2418

12 3 4

0.22 F

10K

10K

Piezo VOUT

1300:8

RING

C1

100nF

R1

12K

VS

f1 = 3.22 •104 / R1 (KΩ); f2 = 5/7 f1; fsweep = 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.

3

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