lmv358-mda National Semiconductor Corporation, lmv358-mda Datasheet - Page 20

• Manufacturer Part Number: lmv358-mda
• Description: General Purpose, Low Voltage, Rail-to-rail Output Operational Amplifiers
• Manufacturer: National Semiconductor Corporation

www.national.com
High Compliance Current Sink
A current sink circuit is shown in Figure 21. The circuit re-
quires only one resistor (R
which is directly proportional to this resistor value.
POWER AMPLIFIER
A power amplifier is illustrated in Figure 22. This circuit can
provide a higher output current because a transistor follower
is added to the output of the op amp.
FIGURE 21. High Compliance Current Sink
FIGURE 20. Fixed Current Source
FIGURE 22. Power Amplifier
E
) and supplies an output current
10006082
10006079
10006080
20
LED DRIVER
The LMV321/LMV358/LMV324 can be used to drive an LED
as shown in Figure 23.
COMPARATOR WITH HYSTERESIS
The LMV321/LMV358/LMV324 can be used as a low power
comparator. Figure 24 shows a comparator with hysteresis.
The hysteresis is determined by the ratio of the two resistors.
where
Since LMV321/LMV358/LMV324 have rail-to-rail output, the
(V
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
National's LMV331/LMV93/LMV339, which are single, dual
and quad general purpose comparators for low voltage oper-
ation.
V
V
V
V
V
OH−
TH+
TH−
OH
OL
H
: Hysteresis Voltage
V
: Output Voltage at Low
: Output Voltage at High
: Positive Threshold Voltage
: Negative Threshold Voltage
OL
FIGURE 24. Comparator with Hysteresis
) is equal to V
V
V
TH+
TH−
= V
= V
V
FIGURE 23. LED Driver
H
REF
REF
= (V
V
H
/(1+R
/(1+R
S
, which is the supply voltage.
= V
OH−
S
V
1
/(1+R
1
OL
/R
/R
)/(1+R
2
2
)+V
)+V
2
/R
OH
OL
1
2
)
/(1+R
/(1+R
/R
1
)
2
2
10006084
/R
/R
1
1
10006078
)
)