Application Information (Continued)
01171329
FIGURE 15. Low Power 3 Op-Amp Instrumentation Amplifier
A 2 op-amp instrumentation amplifier designed for a gain of
100 is shown in Figure 16. Low sensitivity trimming is made
for offset voltage, CMRR and gain. Low cost and low power
consumption are the main advantages of this two op-amp
circuit.
Higher frequency and larger common-mode range applica-
tions are best facilitated by a three op-amp instrumentation
amplifier.
01171330
FIGURE 16. Low-Power Two-Op-Amp Instrumentation Amplifier
11.0 SPICE MACROMODEL
A spice macromodel is available for the LMC6482. This
model includes accurate simulation of:
•
•
•
•
•
Input common-mode voltage range
Frequency and transient response
GBW dependence on loading conditions
Quiescent and dynamic supply current
Output swing dependence on loading conditions
and many more characteristics as listed on the macromodel
disk.
Contact your local National Semiconductor sales office to
obtain an operational amplifier spice model library disk.
19
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