LMC6464QML

SNOSAR8A – DECEMBER 2010 – REVISED MARCH 2013

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(Input pins are lifted out of PC board and soldered directly to components. All other pins connected to PC board.)

Figure 46. Air Wiring

INSTRUMENTATION CIRCUITS

The LMC6464 has the high input impedance, large common-mode range and high CMRR needed for designing

instrumentation circuits. Instrumentation circuits designed with the LMC6464 can reject a larger range of

common-mode signals than most in-amps. This makes instrumentation circuits designed with the LMC6464 an

excellent choice for noisy or industrial environments. Other applications that benefit from these features include

analytic medical instruments, magnetic field detectors, gas detectors, and silicon-based transducers.

instrumentation circuit in Figure 47. This combination is used instead of one large valued potentiometer to

increase gain trim accuracy and reduce error due to vibration.

Figure 47. Low Power Three Op-Amp Instrumentation Amplifier

A two op-amp instrumentation amplifier designed for a gain of 100 is shown in Figure 48. 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 applications are best facilitated by a three op-amp

instrumentation amplifier.

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