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參數(shù)資料
| 型號(hào)： | LMC6001CIN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | Ultra Ultra-Low Input Current Amplifier |
| 中文描述： | OP-AMP, 1350 uV OFFSET-MAX, 1.3 MHz BAND WIDTH, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 10/14頁(yè) |
| 文件大?。?/td> | 305K |
| 代理商： | LMC6001CIN |
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Two Opamp, Temperature
Compensated pH Probe Amplifier
(Continued)
the feedback loop. This cancels the temperature depen-
dence of the probe. This resistor must be mounted where it
will be at the same temperature as the liquid being mea-
sured.
The LMC6001 amplifies the probe output providing a scaled
voltage of
±
100 mV/pH from a pH of 7. The second opamp,
a micropower LMC6041 provides phase inversion and offset
so that the output is directly proportional to pH, over the full
range of the probe. The pH reading can now be directly dis-
played on a low cost, low power digital panel meter. Total
current consumption will be about 1 mA for the whole sys-
tem.
The micropower dual operational amplifier, LMC6042, would
optimize power consumption but not offer these advantages:
1.
The LMC6001A guarantees a 25 fA limit on input current
at 25C.
The input ESD protection diodes in the LMC6042 are
only rated at 500V while the LMC6001 has much more
robust protection that is rated at 2000V.
The setup and calibration is simple with no interactions to
cause problems.
1.
Disconnect the pH probe and with R3 set to about
mid-range and the noninverting input of the LMC6001
grounded, adjust R8 until the output is 700 mV.
2.
Apply 414.1 mV to the noninverting input of the
LMC6001. Adjust R3 for and output of 1400 mV. This
completes the calibration. As real pH probes may not
perform exactly to theory, minor gain and offset adjust-
ments should be made by trimming while measuring a
precision buffer solution.
2.
Ultra-Low Input Current Instrumentation Amplifier
Figure 8 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 M
imbalance in source resistance. Input cur-
rent is less than 20 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 re-
sistors. For good CMRR over temperature, low drift resistors
should be used.
DS011887-15
R1 100k + 3500 ppm/C (Note 12)
R2 68.1k
R3, 8 5k
R4, 9 100k
R5 36.5k
R6 619k
R7 97.6k
D1 LM4040D1Z-2.5
C1 2.2 μF
Note 12:
(Micro-ohm style 144 or similar)
FIGURE 7. pH Probe Amplifier
www.national.com
10
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LMC6001BIN | Ultra Ultra-Low Input Current Amplifier |
| LMC6001BIH | Ultra Ultra-Low Input Current Amplifier |
| LMC6001AIN | Ultra Ultra-Low Input Current Amplifier |
| LMC6001 | Ultra Ultra-Low Input Current Amplifier |
| LMC6008 | 8 Channel Buffer |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMC6001CIN | 制造商:Texas Instruments 功能描述:IC OP AMP LOW INPUT CURRENT 6001 |
| LMC6001CIN/NOPB | 制造商:Texas Instruments 功能描述:IC AMP ULTRA LO INPUT CURR 8-DIP |
| LMC6008 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8 Channel Buffer |
| LMC6008IM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8 Channel Buffer |
| LMC6008IMX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:8 Channel Buffer |
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