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| TONE RINGER S1T2410B01/B02 INTRODUCTION 8-DIP-300 The S1T2410B01/B02 is a bipolar integrated circuit designed as a telephone bell replacement. FUNCTIONS * * * Two oscillators Output amplifier Power supply control circuit FEATURES * * * * * * * * * * Designed for telephone bell replacement Low drain current Small size MINIDIP package Adjustable 2-frequency tone Adjustable warbling rate Built-in hysteresis prevents false triggering and rotary dial `CHIRPS' Extension tone ringer modules Alarms or other alerting devices External triggering or ringer disable (S1T2410B01) Adjustable for reduced initial supply current (S1T2410B02) ORDERING INFORMATION Device S1T2410B01-D0B0 S1T2410B02-D0B0 Package 8-DIP-300 Operating Temperature -45C to +65C 1 S1T2410B01/B02 TONE RINGER PIN CONFIGURATION VCC VCONT LFI LFO 1 2 3 4 8 7 6 5 OUTPUT HFI HFO GND S1T2410B01/ S1T2410B02 ABSOLUTE MAXIMUM RATINGS Characteristic Supply Voltage Power Dissipation Operating Temperature Storage Temperature Symbol VCC PD TOPR TSTG Value 30 400 - 45 to +65 -65 to +150 Unit V mW C C 2 TONE RINGER S1T2410B01/B02 ELECTRICAL CHARACTERISTICS (Ta = 25C) (All voltage referenced to GND unless otherwise specified) Characteristic Operating Voltage Initiation Voltage1 Initiation Current1 Sustaining Voltage2 Sustaining Current2 Trigger Voltage3 Trigger Current3 Disable Voltage4 Disable Current4 Output Voltage High Output Voltage Low Input Current 1 (Pin 3) Input Current 2 (Pin 7) High Frequency 1 High Frequency 2 Low Frequency Symbol VCC VSI ISI VSUS ISUS VTRG ITRG VDIS IDIS VOH VOL II (PIN 3) II (PIN 7) fH1 fH2 fL See Fig. 1 S1T2410B02 -6.8K-Pin 2 to GND See Fig. 1 No Load VCC = VSUS, See Fig. 1 S1T2410B01 Only VCC = 15V S1T2410B01 Only S1T2410B01 Only S1T2410B01 Only VCC = 21V, I8 = -15mA Pin 6 = 6V, Pin 7 = GND VCC = 21V, I8 = 15mA Pin 6 = GND, Pin 7 = 6V Pin 3 = 6V, Pin 4 = GND Pin 7 = 6V, Pin 6 = GND R3 = 191K, C3 = 6800pF R3 = 191K, C3 = 6800pF R2 = 165K, C2 = 0.47F - - 461 576 9.0 - - 512 640 10 500 500 563 704 11.0 nA nA Hz Hz Hz - - 1.6 V Test Conditions - Min. - 17 1.4 9.7 0.7 9.0 10.0 - -40 17.0 Typ. - 19 2.5 11.0 1.4 10.5 20.0 - -50 19.0 Max. 29.0 21 4.2 12.0 2.5 12.0 10005 0.8 - 21.0 Unit V V mA V mA V A V A V NOTES: (see electrical characteristics sheet) 1. Initial supply voltage (VSI) is the supply voltage required to start tone ringer oscillation 2. Sustaining voltage (VSUS) is the supply voltage required to maintain oscillation. 3. VTR and ITR are the conditions applied to trigger to start oscillation for VSUS VCC VSI 4. VDIS and lDIS are the conditions applied to trigger to inhibit oscillation for VSI VCC 5. Trigger current must be limited to this value externally. 3 S1T2410B01/B02 TONE RINGER CHARACTERISTIC CURVE S1T2410B01 Supply Current (No Load) Vs. Supply Voltage VCC (V), Supply Voltage Figure 1. S1T2410B02 Supply Current (No Load) Vs. Supply Voltage VCC (V), Supply Voltage Figure 2. 4 TONE RINGER S1T2410B01/B02 APPLICATION INFORMATION The application circuit illustrates the use of the S1T2410B01/B02 devices in typical telephone or extensive tone ringer applications. The AC ringer signal voltage appears across the TIP and RING inputs of the circuit, and is attenuated by capacitor C1 and resistor R1. (C1 also provides isolation from DC voltages (48V) on the exchange line). After full wave rectification by the bridge diode, the wave form is filtered by capacitor C4 to provide a DC supply for the tone ringer chip. When this voltage exceeds the initiation (VSI), oscillation starts. With the components shown, the output frequency chops between 512 Hz (fH1) and 640Hz (fH2) at a 10Hz (fL) rate. The loudspeaker load is coupled through a 1300 to 8 transformer. The output coupling capacitor C5 with transformer coupled loads is required. When driving a piezo-ceramic transducer type load, the coupling C5 and transformer (1300 :8 ) are not required. However, a current limiting resistor is required. The low frequency oscillator oscillates at a rate (fL) controlled by an external resistor (R2) and capacitor (C2). The frequency can be determined using the function fL = 1/(1.289 R2 * C2). The high frequency oscillates at a fH1, fH2 controlled by an external resistor (R3) and capacitor (C3). The frequency can be determined using the function tHI = 1/(1.504 R3 * C3). Voltage remains constant independent of RSL. Pin 2 of the S1T2410B02 allows connection of an external resistor RSL, which is used to program the slope of the supply current vs supply voltage characteristics (see Fig. 2) and hence the supply current up to the initial voltage (VSI). This initial voltage remains constant independent of RSL. The supply current drawn prior to triggering is inversely proportional with RSL, decreasing for an increasing value of resistance. Thus, increasing the value of RSL, will decrease the amount of AC ringing current required to trigger the device. Longer subscriber loops are possible since less voltage is dropped per unit length of loop wire due to the lower current level. RSL can also be used to compensate for smaller AC coupling capacitors (C5 on Fig. 3) (higher impedance) to the line which is used to alter the ringer equivalence number of a tone ringer circuit. The graph in Fig. 2 illustrates the variation of supply current with supply voltage of the S1T2410B02. Three curves are drawn to show the variation of the initiation current with RSL. Curve B (RSL = 6.8k) shows the I-V characteristic for the S1T2410B02 tone ringer. Curve A is a plot with RSL < 6.8k and shows an increase in the current drawn up to the initiation voltage VSI. After initiation, the I-V characteristic remain unchanged. Curve C illustrates the effect of increasing RSL above 6.8k initiation current decreases, but is unchanged after triggering. 5 S1T2410B01/B02 TONE RINGER APPLICATION CIRCUIT 1 (S1T2410B01) TIP C1 R1 0.9uF 560 _ + 1 2 100K -- 200K 3 R2 165K +1% 1 2 3 8 7 6 5 C5 0.22uF RING C4 22uF/35V 100K VOLUME R3 191K +1% 6.8nF+5% D1 29V C3 4 4 15K C2 0.47uF+5% SPEAKER 1300 : 8 Figure 3. S1T2410B01 Application Circuit APPLICATION CIRCUIT 2 (S1T2410B02) TIP C1 R1 0.9uF 560 _ + 1 2 29V 22uF/35V S1T2410B02 3 R2 165K +1% 8 7 6 5 C5 0.22uF R3 191K +1% 6.8nF+5% 100K VOLUME RING RSL C4 C3 4 C2 0.47uF+5% 15K SPEAKER 1300 : 8 Figure 4. S1T2410B02 Application Circuit 6 TONE RINGER S1T2410B01/B02 EQUIVALENT CIRCUIT (Pin 2 Input) INHIBITING OSCILLATION +VCC S1T2410B01 1 2 8 1 8 7 ID 7 2 S1T2410B01 S1T2410B01 6 5 PIN2 R 3 4 R1 3 4 6 5 V1 VD 0 < VD < 0.5V ID = VD - VI RI > 40uA Figure 5. Triggering The S1T2410B01 From CMOS or TTL Logic Figure 6. +12 to +15V +12 to +24V +5V 50K 1 Ring "L" Inhibit "H" 1/6 4049UB 10K 8 7 6 5 Ring "L" Inhibit "H" 74HCTLS06 1 2 S1T2410B01 3 4 8 7 6 5 2 3 4 S1T2410B01 Figure 7. Figure 8. 7 S1T2410B01/B02 TONE RINGER PROGRAMMING THE S1T2410B01 INITIATION SUPPLY VOLTAGE VSI +VCC VZ ITR 1 2 8 1 2 S1T2410B01 3 VT 4 8 7 6 5 RE 7 RE 3 S1T2410B01 6 5 VT 4 20K M VSI=VT+VZ+20RE (RE in M) Figure 9. Figure 10. 8 |
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