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GL6850
GL6850
TWO TONE RINGER
Description
The GL6850 tone ringer is a monolithic device, which incorporates two oscillators, and 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 power control circuit has builtin hysteresis to prevent false triggering and rotary dial chirps. The GL6850 can be triggered externally under logic control.
Pin Configuration
VCC 1 TRIG_IN 2
8 OUTPUT 7 HIGHOSC_2
GL6850
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. External triggering or ringer disable. Include ESD protection.
Block Diagram
4 3 2 1
POWER SUPPLY CONTROL CIRCUIT (WITH HYSTERSIS)
LOW FREQUENCY OSCILLATOR
HIGH FREQUENCY OSCILLATOR
OUTPUT AMPLIFIER
5
6
7
8
1
GL6850
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 Trigger Voltage3 Trigger Current3 Disable Voltage4 Disable Current4 Output Voltage High Output Voltage Low SYMBOL VCC VSI ISI VSUS ISUS VTR ITR VDIS IDIS 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 9.0 461 640 10 563 704 11.0 Hz Hz Hz TEST CONDITION MIN 17 0.9 9.7 0.4 9.5 40 -50 17 TYP 19 2.0 11.0 1.0 19 MAX 29.0 21 3.7 12.0 2.0 10005 0.8 21 2 UNIT V V mA V mA V A V A V V
VCC = 15 V VCC = 15 V VCC = 21 V VCC = 21 V VCC =21V, I8=-10mA Pin6 =6V,Pin7=GND VCC =21V, I8= -10mA Pin6= GND,Pin7=6V
* NOTE 1. 2. 3. 4. 5. Initial supply voltage (VSI) is the supply voltage required to start the tone ringer oscillation. Sustaining voltage (VSUS) in the supply voltage required to maintain oscillation. VTR and ITR are the conditions applied to trigger to start for VSUS A CC A SI V V VDIS and IDIS are the conditions applied to trigger to inhibit oscillation for VSI AVCC Trigger current must be limited to this value externally.
2
GL6850
PIN DESCRIPTION
PIN NUMBER PIN 1 PIN2 PIN3 PIN 4 PIN 5 PIN 6 PIN 7 PIN 8 PIN FUNCTION VCC TRIG_IN LOWOSC_1 LOWOSC_2 GND HIGHOSC_1 HIGHOSC_2 OUTPUT DESCRIPTION Operating supply D.C. voltage rectified from ringing signal. Oscillator External Trigger/Inhibit pin (must beconnected through a current limiting resistor, which is used to program the slope of supply current vs voltage.) 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 2 3 RING C4 R1 = 560 ohm R2 = 165 kohm R3 = 191 kohm D1 R2 4 5 8 7 6 R3 C3 10K VOLUME
100K-200K
GL 6850
C1 = 0.9uF C2 = 0.47uF C3 = 6.8nF C4 = 22uF / 35V C5 = 0.22uF D1 = 29 V ZD
C2
15K 1300 : 8 ohm
3

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