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| 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 O ) continuous Calling Voltage(f=50 O ) 5s ON/10s OFF Supply Current Operating Temperature Storage Temperature 120Vrms 200Vrms 22 I -20 to 75 E -65 to 150 E 14 - R1( U ) 95 Features Test Circuit For GL6840A f1 = * Low current consumption, in order to allow the 1000 f 2 = 0.717 x f1 fsweep = parallel operation of 4 devices C1( Y ) * Integrated rectifier bridge with zener diodes to 1 2.2 U protect against overvoltages Buzzer * Little external circuitry * Tone and switching frequencies adjustable by VAB Line 8 5 external components GL6840A 7 6 * Integrated voltage and current hysteresis 1 2 3 4 10 * Bridge output configuration VS C1 R1 14 U 100 Y 3.26 x 104 x (2 - e R1( U ) ) 1 GL6840 Block Diagram 7 Bridge Diode Overvoltage Protection Threshold Detector 8 2 1 Sweep Frequency Oscillator Tone Generation Oscillator Output Stage 5 6 3 4 Pin Description PIN 1,8 2 3 NAME LINE GND Sweep Rate Control Capacitor DESCRIPTION Input terminals to bridge diode. The AC ringing signal from the telephone line drives the ringer through bridge. Ground This pin is connected to external capacitor to control the sweeping frequency(fSWEEP) 4 Output Frequency This pin is connected to external resistor to control the two tone Control Resistor frequency(f1, f2) Buzzer Rectifier Capacitor The tone ringer output terminals which have inverse output phase each others. This pin is connected to external capacitor to change AC ringing signal into DC voltage. 5,6 7 2 GL6840 unless otherwise specified Electrical Characteristics : TA=25 E PARAMETER Supply Voltage SYMBOL VS(pin7) VS=16.5 to 29.5V 12.3 8 6.4 VS-5 VS=20V 35 1.2 13.3 8.9 CONDITIONS MIN. TYP. MAX. 26 1.8 14.4 9.7 UNIT V I V V U V I Current Consumption without IB load(pin 1-8) Activation Voltage Sustaining Voltage Differential Resistance in OFF condition(pin 8-1) Output Voltage Swing Short Circuit Current (pin 5-6) Voltage Drop between pin 8-1 and pin 7-2 Output Frequencies FOUT1 FOUT2 Programming Resistor Range Sweep Frequency FSWEEP VON VOFF RD VOUT IOUT VD VS=26V R1=14 U VS=0V 1.96 VS=6V 1.42 8 C1=100 Y 7 3 V F1 F2 2.3 1.67 2.65 1.92 20 O U O 10 13 3 GL6840 Typical Application Figure1 : Single output applied pin#5 TIP 1 250V AC 2.2 U C2 VAB Tel Line C3 10 R2 7 1 VS 8 6 GL6840A 2 3 C1 100 Y 4 R1 14 U Piezo Vout 5 10 U 0.22 10 U RING Figure2 : Single output applied pin#6 TIP 1 250V AC 2.2 U C2 VAB Tel Line C3 10 R2 7 1 VS 8 6 GL6840A 2 3 C1 100 Y 5 4 R1 14 U 10 U Piezo Vout 0.22 10 U RING Note) Using a big size buzzer, pin#6 output is better than pin#5 output. Figure3 : Differential output TIP 1 250V AC C2 VAB Tel Line C3 10 2.2 U R2 7 1 VS 8 GL6840A 2 3 C1 100 Y 4 R1 14 U 6 5 Piezo 10 U 0.22 10 U RING 4 C C C C C C C C C C C C Speaker 1300:8 U C C C C C C C C Speaker 1300:8 U Speaker 1300:8 U C C C C GL6840 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 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 GL6840B 2 3 4 8 7 6 5 Line Rectifier capacitor Buzzer Buzzer (Top View) Absolute Maximum Ratings Calling Voltage(f=50 O ) continuous Calling Voltage(f=50 O ) 5s ON/10s OFF Supply Current Operating Temperature Storage Temperature 120Vrms 200Vrms 22 I -20 to 75 E -65 to 150 E Features Test Circuit For GL6840B f1 = * Low current consumption, in order to allow the 1000 parallel operation of 4 devices f 2 = 0.717 x f1 fsweep = C1( Y ) * Integrated rectifier bridge with zener diodes to 1 2.2 U protect against overvoltages Buzzer * Little external circuitry * Tone and switching frequencies adjustable by 5 8 Line VAB external components GL6840B 7 6 * Integrated voltage and current hysteresis 1 2 3 4 10 * Bridge output configuration VS C1 R1 39 U 100 Y 3.32 x 104 39 - R1( U ) x (2 - e 358 ) R1( U ) 5 GL6840 Block Diagram 7 Bridge Diode Overvoltage Protection Threshold Detector 8 2 1 Sweep Frequency Oscillator Tone Generation Oscillator Output Stage 5 6 3 4 Pin Description PIN 1,8 NAME LINE DESCRIPTION Input terminals to bridge diode. The AC ringing signal from the telephone line drives the ringer through bridge. Ground This pin is connected to external capacitor to control the sweeping frequency(fSWEEP) 2 GND Sweep Rate Control Capacitor 3 4 Output Frequency This pin is connected to external resistor to control the two tone Control Resistor frequency(f1, f2) Buzzer Rectifier Capacitor The tone ringer output terminals which have inverse output phase each others. This pin is connected to external capacitor to change AC ringing signal into DC voltage. 5,6 7 6 GL6840 unless otherwise specified Electrical Characteristics : TA=25 E PARAMETER Supply Voltage SYMBOL VS(pin7) IB VON VOFF RD VOUT IOUT VD VS=26V R1=39 U VS=0V 723 VS=6V 519 27 C1=100 Y 7 10 VS=20V VS=16.5 to 29.5V 12.3 8 6.4 VS-5 35 3 1.2 13.3 8.9 CONDITIONS MIN. TYP. MAX. 26 1.8 14.4 9.7 UNIT V I V V U V I V Current Consumption without load(pin 1-8) Activation Voltage Sustaining Voltage Differential Resistance in OFF condition(pin 8-1) Output Voltage Swing Short Circuit Current (pin 5-6) Voltage Drop between pin 8-1 and pin 7-2 Output Frequencies FOUT1 FOUT2 Programming Resistor Range Sweep Frequency F1 F2 850 610 978 702 51 13 O U O FSWEEP 7 7 GL6840 Typical Application Figure1 : Single output applied pin#5 TIP 1 250V AC C2 VAB Tel Line C3 10 2.2 U R2 7 1 VS 8 6 GL6840B 2 3 C1 100 Y 4 R1 39 U Piezo Vout 5 10 U 0.22 10 U RING Figure2 : Single output applied pin#6 TIP 1 250V AC 2.2 U C2 VAB Tel Line C3 10 RING R2 8 7 1 VS 6 GL6840B 2 3 C1 100 Y 4 R1 39 U Piezo Vout 5 10 U 0.22 10 U Note) Using a big size buzzer, pin#6 output is better than pin#5 output. Figure3 : Differential output TIP 1 250V AC 2.2 U C2 VAB Tel Line C3 10 R2 8 7 1 VS GL6840B 2 3 C1 100 Y 4 R1 39 U 6 5 Piezo 10 U 0.22 10 U RING 8 C C C C C C C C C C C C Speaker 1300:8 U C C C C C C C C Speaker 1300:8 U Speaker 1300:8 U C C C C |
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