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LMC6062AMN Datasheet(PDF) 9 Page - National Semiconductor (TI) |
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LMC6062AMN Datasheet(HTML) 9 Page - National Semiconductor (TI) |
9 / 12 page Applications Hints (Continued) 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 in- sulator. Air is an excellent insulator. In this case you may have to forego some of the advantages of PC board con- struction, but the advantages are sometimes well worth the effort of using point-to-point up-in-the-air wiring. See Figure 6. Latchup CMOS devices tend to be susceptible to latchup due to their internal parasitic SCR effects. The (I/O) input and output pins look similar to the gate of the SCR. There is a minimum cur- rent required to trigger the SCR gate lead. The LMC6062 and LMC6082 are designed to withstand 100 mA surge cur- rent on the I/O pins. Some resistive method should be used to isolate any capacitance from supplying excess current to the I/O pins. In addition, like an SCR, there is a minimum holding current for any latchup mode. Limiting current to the supply pins will also inhibit latchup susceptibility. Typical Single-Supply Applications (V + = 5.0 V DC) The extremely high input impedance, and low power con- sumption, of the LMC6062 make it ideal for applications that require battery-powered instrumentation amplifiers. Ex- amples of these types of applications are hand-held pH probes, analytic medical instruments, magnetic field detec- tors, gas detectors, and silicon based pressure transducers. Figure 7 shows an instrumentation amplifier that features high differential and common mode input resistance (>10 14 Ω), 0.01% gain accuracy at A V = 100, excellent CMRR with 1 k Ω imbalance in bridge source resistance. In- put current is less than 100 fA and offset drift is less than 2.5 µV/˚C. R 2 provides a simple means of adjusting gain over a wide range without degrading CMRR. R 7 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. DS011298-7 (a) Inverting Amplifier DS011298-8 (b) Non-Inverting Amplifier DS011298-9 (c) Follower FIGURE 5. Typical Connections of Guard Rings DS011298-10 (Input pins are lifted out of PC board and soldered directly to components. All other pins connected to PC board). FIGURE 6. Air Wiring www.national.com 9 |
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