LMC6482QML Datasheet, PDF (23/28 Pages) Texas Instruments – CMOS Dual Rail-To-Rail Input and Output Operational Amplifier

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FIGURE 23. Low Voltage Peak Detector with Rail-to-Rail Peak Capture Range
In Figure 23 dielectric absorption and leakage is minimized
by using a polystyrene or polyethylene hold capacitor. The
droop rate is primarily determined by the value of C_H and
diode leakage current. The ultra-low input current of the
LMC6482 has a negligible effect on droop.
FIGURE 24. Rail-to-Rail Sample and Hold
The LMC6482's high CMRR (82dB) allows excellent accuracy
throughout the circuit's rail-to-rail dynamic capture range.
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FIGURE 25. Rail-to-Rail Single Supply Low Pass Filter
The low pass filter circuit in Figure 25 can be used as an anti-
aliasing filter with the same voltage supply as the A/D con-
verter.
Filter designs can also take advantage of the LMC6482 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.
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