HEI GL6851 Datasheet

1

2 3 4 5 6 7 8

VCC

RSL

LOWOSC_1

LOWOSC_2

OUTPUT

HIGHOSC_2

HIGHOSC_1

GND

6 7 8 4 3

LOW FREQUENCY

HIGH FREQUENCY

OUTPUT

GL6851

GL6851

TWO TONE RINGER

Description

The GL6851 tone ringer is a monolithic device,
which incorporates two oscillators, an 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 GL6851 has provision for
adjustment of the supply initiation current.

Pin Configuration

1

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.

• Adjustable for reduced supply initiation current

• Include ESD protection.

Block Diagram

2

GL6851

1

POWER SUPPLY

CONTROL CIRCUIT

(WITH HYSTERESIS)

OSCILLATOR

5

OSCILLATOR

AMPLIFIER

2

Absolute Maximum Ratings (Ta = 25¡É)

CHARACTERISTICS SYMBOL VALUE UNIT

Supply Voltage
Power Dissipation
Operating Temperature
Storage Temperature

Electrical Characteristics (Ta = 25¡É)

CHARACTERISTICS SYMBOL
Operating Supply Voltage V
Initiation Supply Voltage
Initiation Supply Current
Sustaining Voltage
Sustaining Current

1

1
2
2

Output Voltage High V

Output Voltage Low V

High Frequency 1
High Frequency 2
Low Frequency

V

V

I

f

f

CC

SI

I

SI

SUS

SUS

OH

OL

H1

H2

f

L

VCC

Po

Topr

Tstg

30

400

-25 to 65

-65 to 150

TEST CONDITION MIN TYP MAX UNIT

- - 29.0 V
17 19 21 V

0.9 2.0 3.7 mA

9.7 11.0 12.0 V

0.4 1.0 2.0 mA

V

=21V, I8=-10mA

CC

Pin6=6V,Pin7=GND
V

=21V, I8= 10mA

CC

Pin6=GND,Pin7=6V

R3=191K,C3=6800pF
R3=191K,C3=6800pF
R2=165K,C2=0.47µF

17 19 21 V

- - 2 V

461
576

9.0

512
640

10

V

mW

¡É
¡É

563
704

11.0

GL6851

Hz
Hz
Hz

* NOTE

1. Initial supply voltage (VSI) is the supply voltage required to start the tone ringer oscillation.

2. Sustaining voltage (V

) in the supply voltage required to maintain oscillation.

SUS