A Comparator is a circuit which accepts two voltages or currents and then switches the output showing which is bigger. Comparators are found in components like analogue to digital converters. Comparators are like operational amplifiers except a comparator is designed to operate with positive feedback and output saturated at one power rail or the other.
How a Comparator works. A comparator samples two input pins and turns on the output when identifying a difference or similarity. An example is when you have a minus voltage on the inverting Pin and a plus non-inverting. When the voltage, on the non-inverting equals the inverting voltage the Pin turns on. Normally the output Pin is open and switches to ground when the comparator is activated.
Why use a Comparator? The primary use of a comparator is converting analog to digital (ADC). Two supply voltage are applied and the difference determines a high or low digital signal.
Types of Comparator. Current sense, Differential / Dual differential, Dual / Dual CMOS, Dual voltage / General voltage, General purpose, Ground sense, High speed / high-speed CMOS, Low current CMOS, Low power / low voltage / low-power CMOS, Micro power, Nano power, Precision, Push/pull output, Quad differential, Rail to rail, Voltage, Window.
Mounting Types. Surface mount Through hole Comparator power supply types. Dual Single
Various package types, pins, sizes, channels per chip, PSRR (power supply rejection ratio), CMRR (common mode rejection ratio) are all available.
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High-Speed Comparators, with fast response timesLow-Power Comparators with
operating currents as low as 210nAHigh-Temperature qualified devicesAutomotive-grade Comparators are AEC-Q100 and AEC-Q101 qualified.
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Linear Technology High speed comparators and micropower comparators
have many useful features such as split input and output supplies, integrated references and amplifiers. They also offer application specific comparators such as window comparators. Micropower Comparator: supply currents as low as ...
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The Texas Instruments LM139, LM239, LM339 and LM2901
are quad differential input voltage comparators designed to operate from a single power supply over a wide range of voltages. The common mode input voltage range includes ground and the devices have ...
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The Texas Instruments LM193, LM293, LM393 and LM2903
are dual differential input voltage comparators designed to operate from a single power supply over a wide range of voltages. The common mode input voltage range includes ground and the devices have ...