These were designed specifically to operate from a single power supply over a wide range of voltages. Operation from split power supplies is also possible and the low power supply current drain is independent of the magnitude of the power supply voltage. These comparators also have a unique characteristic in that the input common-mode voltage range includes ground, even though operated from a single power supply voltage. Application areas include limit comparators, simple analog to digital converters; pulse, square wave and time delay generators; wide range VCO; MOS clock timers; multi vibrators and high voltage digital logic gates. When operated from both plus and minus power supplies, they will directly interface with MOS logic — where the low power drain of the LM is a distinct advantage over standard comparators.
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The devices consist of four independent voltage comparators that are designed to operate from a single power supply. Also operation from dual supplies is possible, as long as the difference between the two supplies is 2 V to 36 V.
LM is a 14 pin device as shown in above pin diagram. Here we will name the pinout of all four comparators on the chip and describe function of each pin. The device is available in many packages; a designer can choose one depending on their requirement. LM is used in applications where a comparison between two voltage signals is required. In addition with four of those comparators on board the device can compare four pairs of voltage signals at a time which comes in handy in some applications.
The comparator is popular among makers and engineers for being low cost and good performance. The device response is also fast enough to satisfy many applications. Now let us take a single comparator from the four and construct a simple application circuit as show below. Here the comparison between voltages V1 and V2 is done by the device and an output is provided as Vo. Also the device is powered from single voltage source of VCC as shown above. Based on the state of the output we can determine whether V1 is higher or V2 is higher at the input.
Subscribe to stay updated with industry's latest Electronics components and news. How to use LM Voltage Comparator First let us consider the internal connection of four comparators in the device as shown below. Component Datasheet. LM Voltage Comparator Datasheet. Tags Voltage Comparator. Get Our Weekly Newsletter!
Analog Comparator LM339 - SMD_
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LM339 IC - Low Power Low Offset Voltage Quad Comparator IC