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GL6840B Datasheet(PDF) 5 Page - Hynix Semiconductor |
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GL6840B Datasheet(HTML) 5 Page - Hynix Semiconductor |
5 / 8 page GL6840 5 GL6840B Electronic Two Tone Ringer Description GL6840B 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 frequen- cies 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) Features • Low current consumption, in order to allow the parallel operation of 4 devices • Integrated rectifier bridge with zener diodes to protect against overvoltages • Little external circuitry • Tone and switching frequencies adjustable by external components • Integrated voltage and current hysteresis • Bridge output configuration Pin Configuration Line Rectifier capacitor Buzzer Buzzer Output freq. Control resistor Sweep rate control capacitor GND Line 1 2 3 4 8 7 6 5 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 GL6840B 8 5 7 1 2 3 4 6 Buzzer R1 39§ Ú C1 100§ Ý VS £ « 10§ Þ VAB Line 1§ Þ 2.2§ Ú (Top View) Test Circuit For GL6840B 3.32 x 104 R 1(§ Ú ) x (2 - e ) f 1 = f 2 = 0.717 x f1 f sweep = 39 - R 1( § Ú ) 358 1000 C 1(§ Ý ) |
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Similar Description - GL6840B |
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