GL6851 Datasheet, PDF (1/3 Pages) Hynix Semiconductor – TWO TONE RINGER

GL6851
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.
GL6851
TWO TONE RINGER
Pin Configuration
VCC 1
8 ^OUTPUT
RSL ₂
LOWOSC_1 ₃
GL6851
7 HIGHOSC_2
6 HIGHOSC_1
LOWOSC_2 4
5 GND
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
4
3
2
1
POWER SUPPLY
CONTROL CIRCUIT
(WITH HYSTERESIS)
LOW FREQUENCY
OSCILLATOR
HIGH FREQUENCY OUTPUT
OSCILLATOR
AMPLIFIER
5
6
7
8
1