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| GL6851 GL6851 TWO TONE RINGER Description The GL6851 tone ringer is a monolithic device, which incorporates two oscillators, an output amplifier and a power supply control circuit. The oscillator frequencies can be adjusted over a wide range by selection of external components. One oscillator, normally operated at a low frequency, causes the second oscillator to alternate between its nominal frequency, and a related higher frequency. The resulting output is a distinct warbling tone. The output amplifier will drive either a transformer coupled loudspeaker or a piezo-ceramic transducer. The device can be powered from a telephone line or a fixed d.c. supply. The GL6851 has provision for adjustment of the supply initiation current. Pin Configuration VCC 1 RSL 2 8 OUTPUT 7 HIGHOSC_2 GL6851 LOWOSC_1 3 LOWOSC_2 4 6 5 HIGHOSC_1 GND Features * * * * * * * * Low current consumption. Designed for telephone bell replacement. Small size MINIDIP package. Adjustable 2- frequency tone. Built-in hysteresis prevents false triggering and rotary dial CHIRPS. Alarms or other alerting devices. Adjustable for reduced supply initiation current Include ESD protection. Block Diagram 4 3 2 1 POWER SUPPLY CONTROL CIRCUIT (WITH HYSTERESIS) LOW FREQUENCY OSCILLATOR HIGH FREQUENCY OSCILLATOR OUTPUT AMPLIFIER 5 6 7 8 1 GL6851 Absolute Maximum Ratings (Ta = 25 E ) CHARACTERISTICS Supply Voltage Power Dissipation Operating Temperature Storage Temperature SYMBOL VCC Po Topr Tstg VALUE 30 400 -25 to 65 -65 to 150 UNIT V mW E E Electrical Characteristics (Ta = 25 E ) CHARACTERISTICS Operating Supply Voltage Initiation Supply Voltage1 Initiation Supply Current1 Sustaining Voltage2 Sustaining Current2 Output Voltage High Output Voltage Low SYMBOL VCC VSI ISI VSUS ISUS VOH VOL fH1 High Frequency 1 High Frequency 2 Low Frequency fH2 fL R3=191K,C3=6800pF R3=191K,C3=6800pF R2=165K,C2=0.47F 461 576 9.0 512 640 10 563 704 11.0 Hz Hz Hz TEST CONDITION MIN 17 0.9 9.7 0.4 17 TYP 19 2.0 11.0 1.0 19 MAX 29.0 21 3.7 12.0 2.0 21 2 UNIT V V mA V mA V V VCC =21V, I8=-10mA Pin6=6V,Pin7=GND VCC =21V, I8= 10mA Pin6=GND,Pin7=6V * NOTE 1. Initial supply voltage (VSI) is the supply voltage required to start the tone ringer oscillation. 2. Sustaining voltage (VSUS) in the supply voltage required to maintain oscillation. 2 GL6851 PIN DESCRIPTION PIN NUMBER PIN 1 PIN2 PIN3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN FUNCTION VCC RSL LOWOSC_1 LOWOSC_2 GND HIGHOSC_1 HIGHOSC_2 OUTPUT DESCRIPTION Operating supply D.C. voltage rectified from ringing signal. Initiation current programming Pin. (Must be connected) Low Frequency Time Constant Adjustment pins fL is controlled externally by R2 and C2 fL = 1/1.289R2C2 Ground High Frequency Time Constant Adjustment Pins fH1 and fH2 are controlled externally by R3 and C3. fH1=1/1.504R3C3, fH2 = 1/1.203R3C3 Tone output APPLICATON CIRCUIT TIP C1 R1 C5 1 RSL 7K - 13K D1 RING C4 R1 = 560 ohm R2 = 165 kohm R3 = 191 kohm R2 2 3 4 8 7 6 5 R3 C3 10K VOLUME GL 6851 C1 = 0.9uF C2 = 0.47uF C3 = 6.8nF C4 = 22f / 35V C5 = 0.22 uF D1 = 29 V C2 15K 1300 : 8 ohm 3 |
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