LS1240A

UNISONIC TECHNOLOGIES CO., LTD LS1240A LINEAR INTEGRATED CIRCUIT 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 Lead Free Halogen Free LS1240AL-D08-T LS1240AG-D08-T - LS1240AG-S08-R Package DIP-8 SOP-8 Packing Tube Tape Reel  MARKING DIP-8 SOP-8 www.unisonic.com.tw Copyright © 2015 Unisonic Technologies Co., Ltd 1 of 5 QW-R108-002.J LS1240A  PIN CONFIGURATION LINE 1 GND 2 CSW 3 Ra 4 LINEAR INTEGRATED CIRCUIT UTC LS1240A 8 LINE 7 Cr 6 NULL 5 OUT  PIN DESCRIPTION PIN NO. 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.J LS1240A  BLOCK D...