GL6840

GL6840 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 the ringing signal cannot affect the correct operation of the devices. The output bridge configuration allows to use a high impedance transducer with acoustical results much better than in a single ended configuration. The two outputs can also be connected independently to different converters or actuators(acoustical, opto and logic) Pin Configuration Line GND Sweep rate control capacitor Output freq. Control resistor 1 GL6840A 2 3 4 8 7 6 5 Line Rectifier capacitor Buzzer Buzzer (Top View) Absolute Maximum Ratings Calling Voltage(f=50§ Ô ) continuous Calling Voltage(f=50§ Ô ) 5s ON/10s OFF Supply Current Operating Temperature Storage Temperature 120Vrms 200Vrms 22§ Ì -20 to 75¡ É -65 to 150¡ É 14 - R1(§ Ú ) 95 Features Test Circuit For GL6840A f1 = Low current consumption, in order t...