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 builtin hysteresis to prevent false triggering and rotary dial chirps. The GL6850 can be triggered externally under logic control.

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.