LMV321-N, LMV321-N-Q1, LMV358-N, LMV358-N-Q1
LMV324-N, LMV324-N-Q1
SNOS012I –AUGUST 2000–REVISED FEBRUARY 2013
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COMPARATOR WITH HYSTERESIS
The LMV321-N/LMV358-N/LMV324-N can be used as a low power comparator. Figure 72 shows a comparator
with hysteresis. The hysteresis is determined by the ratio of the two resistors.
VTH+ = VREF/(1+R 1/R2)+VOH/(1+R2/R1)
VTH− = VREF/(1+R 1/R2)+VOL/(1+R2/R1)
VH = (VOH−VOL)/(1+R 2/R1)
(30)
(31)
(32)
where
VTH+: Positive Threshold Voltage
VTH−: Negative Threshold Voltage
VOH: Output Voltage at High
VOL: Output Voltage at Low
VH: Hysteresis Voltage
Since LMV321-N/LMV358-N/LMV324-N have rail-to-rail output, the (VOH−VOL) is equal to VS, which is the supply
voltage.
VH = VS/(1+R2/R1)
(33)
The differential voltage at the input of the op amp should not exceed the specified absolute maximum ratings.
For real comparators that are much faster, we recommend you use Texas Instruments's
LMV331/LMV93/LMV339, which are single, dual and quad general purpose comparators for low voltage
operation.
Figure 72. Comparator with Hysteresis
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