Datasheet

LMV321-N, LMV321-N-Q1, LMV358-N, LMV358-N-Q1
LMV324-N, LMV324-N-Q1
SNOS012I –AUGUST 2000–REVISED FEBRUARY 2013 www.ti.com
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.
V
TH+
= V
REF
/(1+R
1
/R
2
)+V
OH
/(1+R
2
/R
1
) (30)
V
TH−
= V
REF
/(1+R
1
/R
2
)+V
OL
/(1+R
2
/R
1
) (31)
V
H
= (V
OH−
V
OL
)/(1+R
2
/R
1
) (32)
where
V
TH+
: Positive Threshold Voltage
V
TH−
: Negative Threshold Voltage
V
OH
: Output Voltage at High
V
OL
: Output Voltage at Low
V
H
: Hysteresis Voltage
Since LMV321-N/LMV358-N/LMV324-N have rail-to-rail output, the (V
OH−
V
OL
) is equal to V
S
, which is the supply
voltage.
V
H
= V
S
/(1+R
2
/R
1
) (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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