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| TONE RINGER WITH DRIDGE DIODE S1T2418G INTRODUCTION The S1T2418G is a monolithic integrated circuit telephone tone ringer with bridge diode. When coupled with an appropriate transducer, it replaces the electro-mechanical bell. This device is designed for use with either a piezo transducer or an inexpensive transformer-coupled speaker to produce a pleasing tone composed of high frequencies (fH1, fH2) alternating with a low frequency (fS) resulting in a warble frequency. The supply voltage is obtained from the AC ring signal and the circuit is designed so that noise on the line or variation of the ringing signal cannot affect correct operation of the device. 8-DIP-300 FEATURES * * * * * * * * Built-in full wave bridge diode rectifier Low current consumption, in order to allow the parallel operation of 4 devices Few external components Tone and adjustable switching frequencies by external components High noise immunity to current hysteresis due to built-in voltage Adjustable activation voltage Internal zener diodes to protect against over-voltages Adjustable ringer impedance with external components APPLICATIONS * * Electronic telephone ringers Extension ringers ORDERING INFORMATION Device S1T2418G01-D0B0 Package 8-DIP-300 Operating Temperature -20C to +70C 1 S1T2418G TONE RINGER WITH BRIDGE DIODE BLOCK DIAGRAM RECTIFIER CAPACITOR 7 ACTIVATION VOLTAGE ADJUSTABLE 6 TIP 8 - + POW ER SUPPLY CONTROL CIRCUIT LOW FREQ OSC HIGH FREQ OSC OUTPUT AMP 5 OUTPUT RING 1 2 GND 3 SWEEP RATE CONTROL CAPACITOR 4 OUTPUT FREQUENCY CONTROL RESISTOR ABSOLUTE MAXIMUM RATINGS Characteristic Calling Voltage (f = 50Hz) Continuous Calling Voltage (f = 50Hz) 5 sec ON / 10 sec OFF Supply Current Operating Temperature Storage and Junction Temperature VC Symbol Value 120 200 22 -20 to + 70 -65 to + 150 Unit Vrms Vrms mA C C VC(0N-OFF) ICC TORR TSTG NOTE: Absolute maximum ratings are those values beyond which permanent damage to the device may occur. These are stress ratings only and functional operation of the device at or beyond them is not implied. Long exposure to these conditions may affect device reliability. 2 TONE RINGER WITH DRIDGE DIODE S1T2418G DC ELECTRICAL CHARACTERISTICS (Ta = 25C) Characteristic Operating Voltage Current Consumption without Load Activation Voltage Activation Voltage Range Sustaining Voltage Differential Resistance in Off Condition Output Voltage Swing Short Circuit Current Symbol VCC ICC VON VONR VSUS RD(OFF) V0(P-P) ISC Test Conditions - VS = 8.8 to 26V - RA = 1K - - - VS = 26V Min. - - 12.2 8 8 6.4 - - Typ. - 1.5 - - - - VCC-3 35 Max. 26 1.8 13 10 8.8 - - - Unit V mA V V V KW V mA AC ELECTRICAL CHARACTERISTICS (Ta = 25C) Characteristic Output Frequencies (S1T2418G01) Symbol fH1 fH2 fH1 fH2 fH1R fS Test Conditions VCC = 26V, R1 = 14K V3 = 0V V3 = 6 VCC = 26V, R1 = 14K V3 = 0V V3 = 6V R1 = 27k to 1.7k R1 = 14k, C1 = 100nF Min. - - - - 0.1 - Typ. 2300 1700 Max. - - - - 15 - Unit Hz Hz Output Frequencies (S1T2418D02) 1900 1300 - 10 Hz Hz kHz kHz fH1 Range Sweep Frequency 3 S1T2418G TONE RINGER WITH BRIDGE DIODE APPLICATION CIRCUIT R3 224 1uF, 250Vac TIP C2 R2 10K 8 6 5 10K 2.2K 7 S1T2418G01 KA2418B/28 Piezo Vout 1 2 3 4 1300 : 8 C3 10uF + RING C1 100nF Vs R1 12K f H1 = 3.22 x 10 ---------------------------R1 ( K ) 4 -f H2 = 5 f 1 7 1000 f S = -------------------C1 ( nF ) Device S1T2418G01 Function fH1 fH1 (R1 = 14k) fH2 (R1 = 14k) 3.22 x 10 ---------------------------R1 ( K ) 4 2300 + 300 (Hz) 1700 + 300 (Hz) 4 |
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