LS1240A

LS1240A UTC | Alldatasheet

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UNISONIC TECHNOLOGIES CO., LTD LS1240A LINEAR INTEGRATED CIRCUIT w w w . u n i s o n i c . c o m . t w 1 of 5 Copyright © 2012 Unisonic Technologies Co., Ltd QW-R108-002.I 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. „ 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. „ ORDERING INFORMATION Ordering Number Package Packing Lead Free Halogen Free LS1240AL-D08-T LS1240AG-D08-T DIP-8 Tube LS1240AL-S08-R LS1240AG-S08-R SOP-8 Tape Reel LS1240AL-S08-T LS1240AG-S08-T SOP-8 Tube

LS1240A LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 5 www.unisonic.com.tw QW-R108-002.I „ PIN CONFIGURATION LINE GND CSW Ra LINE NULL OUT Cr UTC LS1240A „ PIN DESCRIPTION PIN PIN NAME DESCRIPTION

1 LINE Connecting pin to B-wire

2 GND Ground

3 Csw Sweep rate control capacitor

4 Ra Output frequency control resistor

5 OUT Buzzer

6 NULL Not connected

7 Cr Rectifier capacitor

8 LINE Connecting pin to A-wire

LS1240A LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 5 www.unisonic.com.tw QW-R108-002.I „ BLOCK DIAGRAM N.C. BUZZER TELEPHONE LINE RECTIFIER CAPACITOR IN IN RECTIFIER BRIDGE THRESHOLD CIRCUIT WITH HYSTERESIS OUTPUT STAGE NONE FREQUENCY GENERATOR SWITCHING FREQUENCY GENERATOR SWEEP RATE CONTROL CAPACITOR OUTPUT FREQYENCY CONTROL RESISTOR GND TELEPHONE LINE „ TEST CIRCUIT R1= 27200 f1(Hz) f2=0.725f1 fSWEEP = 750 C1(nF) 2.2k F F 100nF 14k RL VoutVAB 1 2 3 4 UTC LS1240A *(1-0.04 In f1 1943 )

LS1240A LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 5 www.unisonic.com.tw QW-R108-002.I „ ABSOLUTE MAXIUM RATINGS PARAMETER SYMBOL RATINGS UNIT Calling Voltage (f=50Hz) Continuous V ABθ 120 V RMS Calling Voltage (f=50Hz) (5s ON/10s OFF) V AB 200 V RMS Supply Current I DC 30 mA Operating Temperature T OPR -40 ~ +70 °C Storage Temperature T STG -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. „ THERMAL DATA PARAMETER SYMBOL RATINGS UNIT Junction to Ambient SOP-8 θJA 150 ℃/W DIP-8 100 „ ELECTRICAL CHARACTERISTICS (TA= 25 , ℃ unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Supply Voltage V S 26 V Current Consumption without load I B V S=9.3 to 25V 1.5 1.8 mA Activation Voltage V ON 12 13.5 V Sustaining Voltage V OFF 7.8 9.3 V Differential Resistance in OFF Condition R D 6.4 k Ω Output Voltage Swing V OUT V S-5 V Short Circuit Current I OUT V S=20V, RL=250Ω 70 mA AC OPERATION Output Frequencies (Vs=26V,R1=14kΩ) fOUT1 V 3=0V 1.55 2.53 kHzfOUT2 V 3=6V 1.08 1.9 Fout1/Fout2 1.33 1.43 Programming Resistor Range 8 56 k Ω Sweep Frequency C1=100nF,R1=14k Ω 5.25 7.5 9.75 Hz

LS1240A LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 5 www.unisonic.com.tw QW-R108-002.I „ TYPICAL APPLICATION CIRCUIT No current limitation is pr ovided 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 fr equencies and the switching frequency can be externally adjusted. The signal and the circuit is designed so that noi se on the line or variations of the ringing signal cannot affect correct operation of the device. UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.