GL6850

1

GL6850

TWO TONE RINGER

Description

The GL6850 tone ringer is a monolithic device,

which

incorporates

two

oscillators,

and

output

amplifier and a power supply control circuit. The

oscillator frequencies can be adjusted over a wide

range by selection of external components. One

oscillator, normally operated at a low frequency,

causes the second oscillator to alternate between its

nominal frequency and a related higher frequency. The

resulting output is a distinct warbling tone. The output

amplifier will drive either a transformer coupled

loudspeaker or a piezo-ceramic transducer.

The device can be powered from a telephone line or

a fixed d.c. supply. The power control circuit has built-

in hysteresis to prevent false triggering and rotary dial

chirps. The GL6850 can be triggered externally under

Pin Configuration

Features

•

Low current consumption.

•

Designed for telephone bell replacement.

•

Small size MINIDIP package.

•

Adjustable 2- frequency tone.

•

Built-in hysteresis prevents false triggering and rotary dial CHIRPS.

•

Alarms or other alerting devices.

•

External triggering or ringer disable.

•

Include ESD protection.

Block Diagram

1

2

3

4

5

6

7

8

GL6850

VCC

TRIG_IN

LOWOSC_1

LOWOSC_2

OUTPUT

HIGHOSC_2

HIGHOSC_1

GND

5

6

7

8

4

3

2

1

POWER SUPPLY

CONTROL CIRCUIT

(WITH HYSTERSIS)

LOW FREQUENCY

OSCILLATOR

HIGH FREQUENCY

OSCILLATOR

OUTPUT

AMPLIFIER