LMV321M7 National Semiconductor, LMV321M7 Datasheet - Page 20

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LMV321M7

Manufacturer Part Number
LMV321M7
Description
OPERATIONAL AMPLIFIER OP AMP IC
Manufacturer
National Semiconductor
Datasheet

Specifications of LMV321M7

No. Of Amplifiers
1
Slew Rate
1V/µs
No. Of Pins
5
Peak Reflow Compatible (260 C)
No
Leaded Process Compatible
No
Amplifier Type
Operational
Package / Case
5-SC-70
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Application Notes
4.6 CURRENT SOURCE AND SINK
The LMV321/358/324 can be used in feedback loops which
regulate the current in external PNP transistors to provide
current sources or in external NPN transistors to provide
current sinks.
4.6.1 Fixed Current Source
A multiple fixed current source is show in Figure 20. A
voltage (V
voltage divider (R
cause the voltage drop across R
controls the emitter current of transistor Q
the base current of Q
is available out of the collector of Q
Large input resistors can be used to reduce current loss and
a Darlington connection can be used to reduce errors due to
the β of Q
The resistor, R
Q
2
either above or below the 1mA reference value.
REF
1
FIGURE 19. Squarewave Generator
.
FIGURE 20. Fixed Current Source
= 2V) is established across resistor R
2
, can be used to scale the collector current of
3
and R
1
and Q
4
). Negative feedback is used to
2
, essentially this same current
(Continued)
1
to be equal to V
1
.
1
and if we neglect
REF
10006076
3
10006080
by the
. This
20
4.6.2 High Compliance Current Sink
A current sink circuit is shown in Figure 21. The circuit
requires only one resistor (R
rent which is directly proportional to this resistor value.
4.7 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.
4.8 LED DRIVER
The LMV321/358/324 can be used to drive an LED as shown
in Figure 23.
FIGURE 21. High Compliance Current Sink
FIGURE 22. Power Amplifier
FIGURE 23. LED Driver
E
) and supplies an output cur-
10006082
10006084
10006079

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