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參數(shù)資料
| 型號(hào)： | LMV841MG |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | CMOS Input, RRIO, Wide Supply Range Operational Amplifier |
| 中文描述： | OP-AMP, 800 uV OFFSET-MAX, 4.5 MHz BAND WIDTH, PDSO5 |
| 封裝： | SC-70, 5 PIN |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 899K |
| 代理商： | LMV841MG |
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The filter responses of filter A and filter B are shown as the
thin lines in
Figure 4
, the response of the combined filter is
shown as the thick line. By shifting the centre frequencies of
the separate filters further apart, the result will be a wider
band, however positioning the centre frequencies too far
apart will result in a less flat gain within the band. For wider
bands more band-pass filters can be cascaded.
Tip: use the WEBENCH internet tools at www.national.com
for your filter application
HIGH IMPEDANCE SENSOR INTERFACE
Many sensors have high source impedances that may range
up to 10 MOhm. The output signal of sensors often needs to
be amplified or otherwise conditioned by means of an ampli-
fier.
The input bias current of this amplifier can load the sensor’s
output and cause a voltage drop across the source resistance
as shown in
Figure 5
, where V
+ = V
S
– I
B
* R
S
. The last term,
I
B
* R
S
, is the voltage drop across R
S
.
The LMV841 can be used to prevent errors introduced to the
system due to this voltage drop. The very low input bias cur-
rent of the LMV841 is a must for the use with high impedance
sensors. This is to keep the error contribution by I
B
* R
S
neg-
ligibly small.
20168352
FIGURE 5. High Impedance Sensor Interface
THERMOCOUPLE AMPLIFIER
The LMV841 is also a very good choice to be used in a ther-
mocouple amplifier application as shown in the example be-
low. The low source impedance of the thermocouple makes
it possible to use a single differential amplifier. A differential
amplifier is used to remove common-mode noise, picked up
by the wires.
20168353
FIGURE 6. Thermocoupler Amplifier
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV841MG/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 12V CMOS RRIO Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV841MG/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifiers |
| LMV841MGX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:CMOS Input, RRIO, Wide Supply Range Operational Amplifiers |
| LMV841MGX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMV841QMG | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LMV841/LMV841Q/LMV842/LMV842Q/LMV844/LMV844Q CMOS Input, RRIO, Wide Supply Range Operational Amplifiers |
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