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LMC6062AMN Datasheet(PDF) 9 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMC6062AMN
Description  Precision CMOS Dual Micropower Operational Amplifier
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMC6062AMN Datasheet(HTML) 9 Page - National Semiconductor (TI)

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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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