GL6840 Datasheet | SK Hynix

GL6840A Electronic Two Tone Ringer Description GL6840A are monolithic integrated circuits designed to replace the mechanical bell in telephone sets, in connection with an electro acoustical converter. The device can drive either directly a piezo ceramic converter(buzzer) or a small loudspeaker. In this case a transformer is needed. The two tone frequencies generated are switched by an internal oscillator in a fast sequence and made audible across output amplifiers in the transducer, both tone frequencies and switching frequency can be externally adjusted. The supply voltage is obtained from the AC rings signal and the circuit is designed so that noise on the line or variations on...