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| KA2418B/28 INTRODUCTION TONE RINGER WITH BRIDGE DIODE The KA2418B/28 is a monolithic integrated circuit telephone tone ringer with bridge diode, when coupled with an appropriate transducer, it replaces the electromechanical 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 a high frequencys (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 can not 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 the 4 devices * Few external components * Tone and adjustable switching frequencies by external components * High noise immunity due to built-in voltage to current hysteresis * Adjustable activation voltage * Internal zener diodes to protect against over voltages * Adjustable ringer impedance with external components. ORDERING INFORMATION Device KA2418B KA2428 Package 8-DIP-300 Operating Temperature - 20C ~ + 70C APPLICATIONS * Electronic telephone ringers * Extension ringers BLOCK DIAGRAM RECTIFIER CAPACITOR 7 ACTIVATION VOLTAGE ADJUSTABLE 6 TIP 8 - + POWER 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 Fig. 1 KA2418B/28 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 TONE RINGER WITH BRIDGE DIODE Symbol VC VC(0N-OFF) ICC T ORR T STG Value 120 200 22 -20 ~ +70 -65 ~ +150 Unit Vrms Vrms mA C C 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. DC ELECTRICAL CHARACTERISTICS Characteristic Operating Voltage Current Consumption without Lode Activiation Voltage Activiation Voltage Range Sustaining Voltage Differential Resistance in off Condition Output Voltage Swing Short Circuit Current (T a = 25C) Test Conditions VS = 8.8 to 26V RA = 1K VS = 26V Min 12.2 8 8 6.4 Typ 1.5 VCC-3 Symbol VCC ICC VON VONR VSUS RD(OFF) V0(P-P) ISC Max 26 1.8 13 10 8.8 - Unit V mA V V V K V mA 35 AC ELECTRICAL CHARACTERISTICS Characteristic (T a = 25C) Test Conditions VCC = 26V,R1 = 14K VCC = OV VCC = 6V VCC = 26V,R1 = 14K VCC = OV VCC = 6V R1=27K to 1.7K R1=14K, C1=100nF 0.1 1900 1300 10 15 HZ HZ KHZ HZ 2300 1700 HZ HZ Min Typ Max Unit Symbol fH1 fH2 fH1 fH2 fH1R fS Output Frequencies (KA2418B) Output Frequencies (KA2428) fH1 Range Sweep Frequency KA2418B/28 TONE RINGER WITH BRIDGE DIODE APPLICATION CIRCUIT R3 224 1uF, 250Vac TIP C2 2.2K R2 10K 8 6 5 10K 7 KA2418B/28 Piezo Vout 1 2 3 4 1300 : 8 C3 10uF + RING Vs C1 100nF R1 12K f1 = 3.22 X 10 R1(K) 4 F2 = 5 7 * f1 fs = 1000 C1(nF) Fig. 2 DEVICE FUNCTION f1 KA2418B KA2428B 3.22 X 10 R1 (K) 4 2.66 X 10 R1 (K) 4 fH1 (R1 = 14K) fH2 (R1 = 14K) 2300 + 300 (HZ) 1700 + 300 (HZ) 1900 + 100 (HZ) 1300 + 100 (HZ) |
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