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) Line 1 GND 2 Sweep rate control capacitor 3 Output freq. Control resistor 4 8 Line 7 Rectifier capacitor 6 Buzzer 5 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 Test Circuit Features GL6840A Pin Configuration For GL6840A f1 = 120Vrms 200Vrms 22§ Ì -20 to 75¡ É -65 to 150¡ É 3.26 x 104 x (2 - e R1(§ Ú ) 14 - R1(§ Ú) 95 ) • Low current consumption, in order to allow the 1000 f 2 = 0.717 x f1 fsweep = parallel operation of 4 devices C1(§ Ý) • Integrated rectifier bridge with zener diodes to 1§ Þ 2.2§ Ú 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§ Þ • Bridge output configuration VS C1 R1 14§ Ú 100§ Ý 1 GL6840 Block Diagram 7 Bridge Diode 8 Threshold Detector Overvoltage Protection 2 1 Sweep Frequency Oscillator Tone Generation Oscillator 3 Output Stage 5 6 4 Pin Description PIN NAME DESCRIPTION 1,8 LINE Input terminals to bridge diode. The AC ringing signal from the telephone line drives the ringer through bridge. 2 GND Ground 3 Sweep Rate Control Capacitor 4 Output Frequency This pin is connected to external resistor to control the two tone Control Resistor frequency(f1, f2) 5,6 Buzzer 7 Rectifier Capacitor This pin is connected to external capacitor to control the sweeping frequency(fSWEEP) 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. 2 GL6840 Electrical Characteristics : TA=25¡ Éunless otherwise specified PARAMETER Supply Voltage SYMBOL CONDITIONS MIN. TYP. MAX. UNIT 26 V 1.2 1.8 § Ì VS(pin7) Current Consumption without IB load(pin 1-8) VS=16.5 to 29.5V Activation Voltage VON 12.3 13.3 14.4 V Sustaining Voltage VOFF 8 8.9 9.7 V RD 6.4 Differential Resistance in OFF condition(pin 8-1) Output Voltage Swing VOUT Short Circuit Current (pin 5-6) IOUT Voltage Drop between pin 8-1 and pin 7-2 VS=20V VD Output Frequencies FOUT1 F1 FOUT2 F2 VS=26V R1=14§ Ú VS=0V 1.96 VS=6V 1.42 Programming Resistor Range Sweep Frequency FSWEEP § Ú VS-5 V 35 § Ì 3 V 2.3 2.65 1.67 1.92 8 C1=100§ Ý 3 7 10 § Õ 20 § Ú 13 § Ô GL6840 Typical Application Figure1 : Single output applied pin#5 1§ Þ250V AC 2.2§ Ú C2 VAB Tel Line R2 0.22§ Þ 6 8 GL6840A 7 £ « C3 10§ Þ 1 2 3 Piezo 4 C1 100§ Ý VS RING 10§ Ú 10§ Ú 5 C C C C TIP Vout C C C C Speaker R1 14§ Ú 1300:8§ Ù Figure2 : Single output applied pin#6 1§ Þ250V AC 2.2§ Ú C2 VAB Tel Line R2 0.22§ Þ 8 6 GL6840A 5 1 2 4 7 £ « C3 10§ Þ C1 100§ Ý VS RING 3 10§ Ú 10§ Ú Piezo C C C C TIP Vout R1 14§ Ú C C C C Speaker 1300:8§ Ù Note) Using a big size buzzer, pin#6 output is better than pin#5 output. Figure3 : Differential output 1§ Þ250V AC C2 VAB Tel Line 2.2§ Ú R2 £ « 8 1 VS 10§ Ú 6 GL6840A 7 C3 10§ Þ RING 0.22§ Þ 2 3 C1 100§ Ý 10§ Ú 5 Piezo 4 R1 14§ Ú C C C C TIP C C C C Speaker 1300:8§ Ù 4 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) Line 1 GND 2 Sweep rate control capacitor 3 Output freq. Control resistor 4 8 Line 7 Rectifier capacitor 6 Buzzer 5 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 Test Circuit Features GL6840B Pin Configuration For GL6840B f1 = 120Vrms 200Vrms 22§ Ì -20 to 75¡ É -65 to 150¡ É 3.32 x 104 39 - R (§ Ú) x (2 - e 3581 ) R1(§ Ú ) • Low current consumption, in order to allow the 1000 parallel operation of 4 devices f 2 = 0.717 x f1 fsweep = C1(§ Ý) • Integrated rectifier bridge with zener diodes to 1§ Þ 2.2§ Ú 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§ Þ • Bridge output configuration VS C1 R1 39§ Ú 100§ Ý 5 GL6840 Block Diagram 7 Bridge Diode 8 Threshold Detector Overvoltage Protection 2 1 Sweep Frequency Oscillator Tone Generation Oscillator 3 Output Stage 5 6 4 Pin Description PIN NAME DESCRIPTION 1,8 LINE Input terminals to bridge diode. The AC ringing signal from the telephone line drives the ringer through bridge. 2 GND Ground 3 Sweep Rate Control Capacitor 4 Output Frequency This pin is connected to external resistor to control the two tone Control Resistor frequency(f1, f2) 5,6 Buzzer 7 Rectifier Capacitor This pin is connected to external capacitor to control the sweeping frequency(fSWEEP) 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. 6 GL6840 Electrical Characteristics : TA=25¡ Éunless otherwise specified PARAMETER Supply Voltage SYMBOL CONDITIONS MIN. TYP. MAX. UNIT 26 V 1.2 1.8 § Ì VS(pin7) Current Consumption without load(pin 1-8) IB VS=16.5 to 29.5V Activation Voltage VON 12.3 13.3 14.4 V Sustaining Voltage VOFF 8 8.9 9.7 V RD 6.4 Differential Resistance in OFF condition(pin 8-1) Output Voltage Swing VOUT Short Circuit Current (pin 5-6) IOUT Voltage Drop between pin 8-1 and pin 7-2 VS=20V VD Output Frequencies FOUT1 FOUT2 F1 F2 VS=26V R1=39§ Ú VS=0V 723 VS=6V 519 Programming Resistor Range Sweep Frequency FSWEEP § Ú VS-5 V 35 § Ì 3 V 850 610 27 C1=100§ Ý 7 10 978 702 § Ô 51 § Ú 13 § Ô 7 7 GL6840 Typical Application Figure1 : Single output applied pin#5 1§ Þ250V AC C2 VAB Tel Line 2.2§ Ú R2 8 C3 10§ Þ 6 1 2 3 Piezo 4 C1 100§ Ý VS RING 10§ Ú 5 10§ Ú GL6840B 7 £ « 0.22§ Þ C C C C TIP Vout C C C C Speaker R1 39§ Ú 1300:8§ Ù Figure2 : Single output applied pin#6 1§ Þ250V AC 2.2§ Ú C2 0.22§ Þ R2 6 8 VAB Tel Line GL6840B 7 £ « C3 10§ Þ 1 2 3 Piezo 4 C1 100§ Ý VS RING 10§ Ú 10§ Ú 5 C C C C TIP Vout R1 39§ Ú C C C C Speaker 1300:8§ Ù Note) Using a big size buzzer, pin#6 output is better than pin#5 output. Figure3 : Differential output 1§ Þ250V AC 2.2§ Ú C2 0.22§ Þ R2 8 VAB Tel Line £ « C3 10§ Þ RING GL6840B 7 1 VS 10§ Ú 6 2 3 C1 100§ Ý 10§ Ú 5 Piezo 4 R1 39§ Ú C C C C TIP C C C C Speaker 1300:8§ Ù 8