{441} Comparator Circuit Explained Using LM339

Описание: {738} Comparator Circuit Explained, Comparator Circuit Using Single Supply Quad
Comparators LM339, LM339E, LM239, LM2901, LM2901E, LM2901V, NCV2901, MC3302 These comparators are designed for use in level detection, low−level sensing and memory applications in consumer, automotive, and industrial electronic applications. These quad comparators feature high gain, wide bandwidth characteristics. This gives the device oscillation tendencies if the outputs are capacitively coupled to the inputs via stray capacitance. This oscillation manifests itself during output transitions (VOL to VOH). To alleviate this situation input resistors 10 k should be used. The addition of positive feedback ( 10 mV) is also
recommended. It is good design practice to ground all unused input pins.
Differential input voltages may be larger than supply voltages without damaging the comparator inputs. Voltages more negative than −300 mV should not be used. The LMx39 and LM2901x are quad comparators with the ability to operate up to an absolute maximum of 36 V on the supply pin. This standard device has proven ubiquity and versatility across a wide range of applications. This is due to very wide supply voltages range (2 V up to 32 V), low Iq, and fast response of the device. The open-drain output allows the user to configure the output logic low voltage (VOL) and allows the comparator to be used in AND functionality.
The comparator operates solely as a voltage comparator, comparing the differential voltage between the positive and negative pins and outputting a logic low or high impedance (logic high with pullup) based on the input
differential polarity.


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