LMC6492 Datasheet, PDF (19/28 Pages) National Semiconductor (TI) – CMOS Rail-to-Rail Input and Output Operational Amplifier

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LMC6492, LMC6494
SNOS724D – AUGUST 2000 – REVISED MARCH 2013
If R1 = R5, R3 = R6, and R4 = R7; then
∴A_V ≈ 100 for circuit shown (R₂ = 9.3k).
Figure 66. Instrumentation Amplifier
Figure 67. Rail-to-Rail Single Supply Low Pass Filter
This low-pass filter circuit can be used as an anti-aliasing filter with the same supply as the A/D converter. Filter
designs can also take advantage of the LMC6492/4 ultra-low input current. The ultra-low input current yields
negligible offset error even when large value resistors are used. This in turn allows the use of smaller valued
capacitors which take less board space and cost less.
Figure 68. Low Voltage Peak Detector with Rail-to-Rail Peak Capture Range
Dielectric absorption and leakage is minimized by using a polystyrene or polypropylene hold capacitor. The
droop rate is primarily determined by the value of C_H and diode leakage current. Select low-leakage current
diodes to minimize drooping.
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