LM339 Quad Voltage Comparator
APPLICATIONS INFORMATION
These dual 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 (V
OL
to V
OH
). To alleviate this situation, input resistors <10 kΩ should be used.
The addition of positive feedback (< 10 mV) is also recommended. It is good design practice to ground all unused pins.
Differential input voltages may be larger than supply voltage without damaging the comparator’s inputs. Voltages more
negative than –0.3 V should not be used.
Zero Crossing Detector
(Single Supply)
Zero Crossing Detector
(Split Supply)
Square Wave Oscillator
Driving Logic
Inverting Comparator With Hysteresis
Non-Inverting Comparator With Hysteresis
FCI [ FIRST COMPONENTS INTERNATIONAL ]
