LMC6482
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SNOS674D –NOVEMBER 1997–REVISED MARCH 2013
Operating from the same supply voltage, the LMC6482 buffers the ADC12038 maintaining excellent accuracy.
Figure 71. Buffering the ADC12038 with the LMC6482
INSTRUMENTATION CIRCUITS
The LMC6482 has the high input impedance, large common-mode range and high CMRR needed for designing
instrumentation circuits. Instrumentation circuits designed with the LMC6482 can reject a larger range of
common-mode signals than most in-amps. This makes instrumentation circuits designed with the LMC6482 an
excellent choice of noisy or industrial environments. Other applications that benefit from these features include
analytic medical instruments, magnetic field detectors, gas detectors, and silicon-based transducers.
A small valued potentiometer is used in series with R
g
to set the differential gain of the 3 op-amp instrumentation
circuit in Figure 72. This combination is used instead of one large valued potentiometer to increase gain trim
accuracy and reduce error due to vibration.
Figure 72. Low Power 3 Op-Amp Instrumentation Amplifier
A 2 op-amp instrumentation amplifier designed for a gain of 100 is shown in Figure 73. 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.
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