參數(shù)資料
型號(hào): LMC6081
廠商: National Semiconductor Corporation
英文描述: CAP 0.01UF 50V 10% X7R SMD-0603 TR-7-PA NI-BAR/SN ROHS
中文描述: 精密CMOS單運(yùn)算放大器
文件頁數(shù): 9/12頁
文件大小: 304K
代理商: LMC6081
Latchup
(Continued)
rent required to trigger the SCR gate lead. The LMC6061
and LMC6081 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 LMC6081 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.
DS011423-11
If R
1
= R
5
, R
3
= R
6
, and R
4
= R
7
; then
A
V
100 for circuit shown (R
2
= 9.822k).
FIGURE 7. Instrumentation Amplifier
DS011423-12
FIGURE 8. Low-Leakage Sample and Hold
www.national.com
9
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LMC6081AIM Precision CMOS Single Operational Amplifier
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