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
VCC 1
RSL 2
8 OUTPUT
7 HIGHOSC_2
GL6851
LOWOSC_1 3
LOWOSC_2 4
6
5
HIGHOSC_1
GND
Features
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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
4
3
2
1
POWER SUPPLY
CONTROL CIRCUIT
(WITH HYSTERESIS)
LOW FREQUENCY
OSCILLATOR
HIGH FREQUENCY
OSCILLATOR
OUTPUT
AMPLIFIER
5
6
7
8
1
HYNIX [ HYNIX SEMICONDUCTOR ]
