TONE RINGER WITH DRIDGE DIODE S1T2418G01/D02 INTRODUCTION 8−DIP−300 The S1T2418G01/D02 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. 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 S1T2418D02-D0B0 Package Operating Temperature 8−DIP−300 −20°C to +70°C 1 S1T2418G01/D02 TONE RINGER WITH BRIDGE DIODE BLOCK DIAGRAM RECTIFIER CAPACITOR ACTIVATION VOLTAGE ADJUSTABLE 7 TIP 8 - RING 6 + POWER SUPPLY CONTROL CIRCUIT LOW FREQ OSC HIGH FREQ OSC OUTPUT AMP 5 OUTPUT 1 2 3 GND SWEEP RATE CONTROL CAPACITOR 4 OUTPUT FREQUENCY CONTROL RESISTOR ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Value Unit Calling Voltage (f = 50Hz) Continuous Calling Voltage (f = 50Hz) VC 120 Vrms 5 sec ON / 10 sec OFF VC(0N-OFF) 200 Vrms Supply Current ICC 22 mA Operating Temperature TORR −20 — + 70 °C Storage and Junction Temperature TSTG −65 — + 150 °C 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 S1T2418G01/D02 DC ELECTRICAL CHARACTERISTICS (Ta = 25°C) Characteristic Symbol Test Conditions Min. Typ. Max. Unit Operating Voltage VCC − − − 26 V Current Consumption without Load ICC VS = 8.8 to 26V − 1.5 1.8 mA Activation Voltage VON − 12.2 − 13 V Activation Voltage Range VONR RA = 1KΩ 8 − 10 V Sustaining Voltage VSUS − 8 − 8.8 V Differential Resistance in Off Condition R D(OFF) − 6.4 − − KW Output Voltage Swing V0(P-P) − − VCC−3 − V Short Circuit Current ISC VS = 26V − 35 − mA AC ELECTRICAL CHARACTERISTICS (Ta = 25°C) Characteristic Symbol Test Conditions Min. Typ. Max. Unit Output Frequencies (S1T2418G01) fH1 fH2 VCC = 26V, R1 = 14KΩ V3 = 0V V3 = 6 − − 2300 1700 − − Hz Hz Output Frequencies (S1T2418D02) fH1 fH2 VCC = 26V, R1 = 14KΩ V3 = 0V V3 = 6V − − 1900 1300 − − Hz Hz fH1 Range fH1R R1 = 27kΩ to 1.7kΩ 0.1 − 15 kHz Sweep Frequency fS R1 = 14kΩ, C1 = 100nF − 10 − kHz 3 S1T2418G01/D02 TONE RINGER WITH BRIDGE DIODE APPLICATION CIRCUIT R3 224 1uF, 250Vac 2.2K C2 R2 TIP 10K 8 10K 5 S1T2418G01 KA2418B/28 S1T2418D02 7 Piezo Vout + C3 10uF 6 1 2 3 4 1300Ω : 8Ω RING R1 12K C1 100nF Vs 4 3.22 × 10 f 5 f H1 = ---------------------------H2 = --- ⋅ f 1 R1 ( K ) 7 Device 1000 f S = -------------------C1 ( nF ) S1T2418G01 S1T2418D02 Function fH1 4 3.22 × 10 ---------------------------R1 ( K ) 4 2.66 × 10 ---------------------------R1 ( K ) fH1 (R1 = 14kΩ) 2300 + 300 (Hz) 1900 + 100 (Hz) fH2 (R1 = 14kΩ) 1700 + 300 (Hz) 1300 + 100 (Hz) 4