LMC6462_14 Datasheet, PDF (17/32 Pages) National Semiconductor (TI) – LMC6462 Dual/LMC6464 Quad Micropower, Rail-to-Rail Input and Output CMOS

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LMC6462, LMC6464
SNOS725D – MAY 1999 – REVISED MARCH 2013
Figure 44. Typical Connections of Guard Rings – Inverting Amplifier
Figure 45. Typical Connections of Guard Rings – Non-Inverting Amplifier
Figure 46. Typical Connections of Guard Rings – Follower
The designer should be aware that when it is inappropriate to lay out a PC board for the sake of just a few
circuits, there is another technique which is even better than a guard ring on a PC board: Don't insert the
amplifier's input pin into the board at all, but bend it up in the air and use only air as an insulator. Air is an
excellent insulator. In this case you may have to forego some of the advantages of PC board construction, but
the advantages are sometimes well worth the effort of using point-to-point up-in-the-air wiring. See Figure 47.
(Input pins are lifted out of PC board and soldered directly to components. All other pins connected to PC board.)
Figure 47. 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.
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