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參數(shù)資料
| 型號(hào)： | LMC6084lN |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | Precision CMOS Quad Operational Amplifier |
| 中文描述： | 精密的CMOS四路運(yùn)算放大器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 278K |
| 代理商： | LMC6084LN |
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 LMC6084 is
designed to withstand 100 mA surge current on the I/O pins.
Some resistive method should be used to isolate any capaci-
tance from supplying excess current to the I/O pins. In addi-
tion, like an SCR, there is a minimum holding current for any
latchup mode. Limiting current to the supply pins will also in-
hibit latchup susceptibility.
Typical Single-Supply
Applications
(V
+
= 5.0 V
DC
)
The extremely high input impedance, and low power con-
sumption, of the LMC6084 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
), 0.01% gain accuracy at A
= 1000, excellent
CMRR with 1 k
imbalance in bridge source resistance. In-
put current is less than 100 fA and offset drift is less than
2.5 μV/C. R
provides a simple means of adjusting gain
over a wide range without degrading CMRR. R
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.
DS011467-8
Inverting Amplifier
DS011467-9
Non-Inverting Amplifier
DS011467-10
Follower
FIGURE 5. Typical Connections of Guard Rings
DS011467-11
(Input pins are lifted out of PC board and soldered directly to components.
FIGURE 6. Air Wiring
www.national.com
9
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