LMC6062_14 Datasheet, PDF (12/21 Pages) National Semiconductor (TI) – LMC6062 Precision CMOS Dual Micropower Operational Amplifier

LMC6062
SNOS631D – NOVEMBER 1994 – 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 29. Air Wiring
Typical Single-Supply Applications
(V⁺ = 5.0 V_DC)
The extremely high input impedance, and low power consumption, of the LMC6062 make it ideal for applications
that require battery-powered instrumentation amplifiers. Examples of these types of applications are hand-held
pH probes, analytic medical instruments, magnetic field detectors, gas detectors, and silicon based pressure
transducers.
Figure 30 shows an instrumentation amplifier that features high differential and common mode input resistance
(>10¹⁴Ω), 0.01% gain accuracy at A_V = 100, excellent CMRR with 1 kΩ imbalance in bridge source resistance.
Input current is less than 100 fA and offset drift is less than 2.5 μV/°C. R₂ provides a simple means of adjusting
gain over a wide range without degrading CMRR. R₇ is an initial trim used to maximize CMRR without using
super precision matched resistors. For good CMRR over temperature, low drift resistors should be used.
If R₁ = R₅, R₃ = R₆, and R₄ = R₇; then
∴A_V ≈ 100 for circuit shown (R₂ = 9.822k).
Figure 30. Instrumentation Amplifier
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