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| UNISONIC TECHNOLOGIES CO., LTD LS1240A ELECTRONIC TONE RINGER WITH BUILT-IN BRIDGE RECTIFIER DESCRIPTION The UTC LS1240A is monolithic integrated circuits and designed to be as a telephone ringer. It can drive a piezo-ceramic converter(buzzer) directly. The output current capacity of UTC LS1240A is higher than standard ringer. For driving a dynamic loudspeaker, UTC LS1240A needs only a decoupling capacitor to replace the usual transformer in use. LINEAR INTEGRATED CIRCUIT SOP-8 DIP-8 FEATURES * Low current consumption. * Integrated rectifier bridge with zener diodes to overvoltage Protection. * Minimum external circuitry. * Both frequencies of tone and switching are adjustable by external components. * Integrated voltage and current hysteresis. *Pb-free plating product number: LS1240AL ORDERING INFORMATION Ordering Number Normal Lead Free Plating LS1240A-D08-T LS1240AL-D08-T LS1240A-S08-R LS1240AL-S08-R LS1240A-S08-T LS1240AL-S08-T Package DIP-8 SOP-8 SOP-8 Packing Tube Tape Reel Tube LS1240AL-D08-T (1)Packing Type (2)Package Type (3)Lead Plating (1) R: Tape Reel, T: Tube (2) D08: DIP-8, S08: SOP-8 (3) Lead Free Plating, Blank: Pb/Sn www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., Ltd 1 of 5 QW-R108-002,H LS1240A PIN CONFIGURATION LINEAR INTEGRATED CIRCUIT LINE 1 2 UTC LS1240 A 8 7 6 5 LINE GND Cr NULL CSW 3 4 Ra OUT PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 PIN NAME LINE GND Csw Ra OUT NULL Cr LINE DESCRIPTION Connecting pin to B-wire Ground Sweep rate control capacitor Output frequency control resistor Buzzer Not connected Rectifier capacitor Connecting pin to A-wire UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 5 QW-R108-002,H LS1240A BLOCK DIAGRAM LINEAR INTEGRATED CIRCUIT TELEPHONE LINE 1 IN RECTIFIER BRIDGE 8 IN TELEPHONE LINE GND 2 7 RECTIFIER CAPACITOR SWEEP RATE CONTROL CAPACITOR 3 SWITCHING FREQUENCY GENERATOR THRESHOLD CIRCUIT WITH HYSTERESIS 6 N.C. 4 OUTPUT FREQYENCY CONTROL RESISTOR NONE FREQUENCY GENERATOR OUTPUT STAGE 5 BUZZER TEST CIRCUIT 1 F 2.2k 8 5 VAB 7 UTC LS 1240A 1 2 RL Vout 10 F 3 4 C1 100nF R1 14k R1= 27200 f1 *(1-0.04 In f1(Hz) 1943 ) f2=0.725f1 fSWEEP = C1(nF) 750 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 5 QW-R108-002,H LS1240A ABSOLUTE MAXIUM RATINGS LINEAR INTEGRATED CIRCUIT PARAMETER SYMBOL RATINGS UNIT Calling Voltage (f=50Hz) Continuous VAB 120 Vrms Calling Voltage (f=50Hz) (5s ON/10s OFF) VAB 200 Vrms Supply Current IDC 30 mA Operating Temperature TOPR -40 ~ +70 C Storage Temperature TSTG -65 ~ +150 C Note Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. ELECTRICAL CHARACTERISTICS (Ta= 25, unless otherwise specified) PARAMETER Supply Voltage Current Consumption without load Activation Voltage Sustaining Voltage Differential Resistance in OFF Condition Output Voltage Swing Short Circuit Current AC Operation Output Frequencies (Vs=26V,R1=14k) Fout1/Fout2 Programming Resistor Range Sweep Frequency SYMBOL TEST CONDITIONS VS IB VS=9.3 to 25V VON VOFF RD VOUT IOUT VS=20V, RL=250 fOUT1 fOUT2 V3=0V V3=6V MIN TYP 1.5 12 7.8 6.4 VS-5 70 1.55 1.08 1.33 8 5.25 MAX UNIT 26 V 1.8 mA 13.5 V 9.3 V k V mA 2.53 1.9 1.43 56 9.75 kHz k Hz C1=100nF,R1=14k 7.5 THERMAL DATA PARAMETER Thermal Resistance Junction to Ambient SOP-8 DIP-8 SYMBOL JA RATINGS 150 100 UNIT /W UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 5 QW-R108-002,H LS1240A TYPICAL APPLICATION CIRCUIT 1 F 2.2k LINEAR INTEGRATED CIRCUIT 8 5 CL LINE 7 UTC LS1240A RL=50 to 1000 4 10 F 1 2 3 C1 100nF R1 14k No current limitation is provided on the output stage of UTC LS1240A, so a minimum load DC of 50 ohms is advised. The two tone frequencies generated are switched by an internal oscillator in a fast sequence and made audible across an output amplifier in the loudspeaker, both tone frequencies and the switching frequency can be externally adjusted. The signal and the circuit is designed so that noise on the line or variations of the ringing signal cannot affect correct operation of the device. U T C assum es no responsibility for equipm ent failures that result from using products at v alues that ex ceed, ev en m om entarily, rated v alues (such as m ax im um ratings, operating condition ranges, or other param eters) listed in products specifications of any and all U T C products described or contained herein. U T C products are not designed for use in life support appliances, dev ices or system s where m alfunction of these products can be reasonably ex pected to result in personal injury. R eproduction in whole or in part is prohibited without the prior written consent of the copyright owner. T he inform ation presented in this docum ent does not form part of any quotation or contract, is believ ed to be accurate and reliable and m ay be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 5 QW-R108-002,H |
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