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GL6840

Electronic Two Tone Ringer

Hyundai Micro Electronics 

GL6840

GL6840B

Electronic Two Tone Ringer

Description

Pin Configuration

GL6840B are monolithic integrated circuits designed

to replace the mechanical bell in telephone sets,

in connection with an electro acoustical converter.

The device can drive either directly a piezo ceramic

converter(buzzer) or a small loudspeaker. In this

case a transformer is needed. The two tone frequen-

cies generated are switched by an internal oscillator

in a fast sequence and made audible across output

amplifiers in the transducer, both tone frequencies

and switching frequency can be externally adjusted.

The supply voltage is obtained from the AC rings

signal and the circuit is designed so that noise on the

line or variations on the ringing signal cannot affect

the correct operation of the devices.

The output bridge configuration allows to use a high

impedance transducer with acoustical results much

better than in a single ended configuration. The two

outputs can also be connected independently to

different converters or actuators(acoustical, opto and

logic)

Line

1

8 Line

GND

2

7

Rectifier

capacitor

Sweep rate

control capacitor

3

6 Buzzer

Output freq.

Control resistor

4

5

(Top View)

Buzzer

Absolute Maximum Ratings

Calling Voltage(f=50§ Ô)

120Vrms

continuous

Calling Voltage(f=50§ Ô)

200Vrms

5s ON/10s OFF

Supply Current

22§ Ì

Operating Temperature

-20 to 75¡ É

Storage Temperature

-65 to 150¡ É

Features

• Low current consumption, in order to allow the

parallel operation of 4 devices

• Integrated rectifier bridge with zener diodes to

protect against overvoltages

Test Circuit

For GL6840B

f1 =

3.32 x

R1(§

104

Ú)

x

(2

-

e

39

- R1(§

358

Ú) )

f2 = 0.717 x f1

1§ Þ 2.2§ Ú

fsweep =

1000

C1(§ Ý)

• Little external circuitry

Buzzer

•

Tone and switching frequencies

external components

adjustable

by

VAB

Line

£

«

• Integrated voltage and current hysteresis

• Bridge output configuration

10§ Þ

8

5

7 GL6840B 6

1234

VS

C1

R1

100§ Ý 39§ Ú

5

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