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參數(shù)資料
| 型號(hào)： | LMV854MTX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 8 MHz Low Power CMOS, EMI Hardened Operational Amplifiers |
| 中文描述： | OP-AMP, 1200 uV OFFSET-MAX, 8 MHz BAND WIDTH, PDSO14 |
| 封裝： | TSSOP-14 |
| 文件頁(yè)數(shù)： | 18/22頁(yè) |
| 文件大小： | 994K |
| 代理商： | LMV854MTX |
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Unwanted Thermocouple Effect
At the point where the thermocouple wires are connected to
the circuit, usually copper wires or traces, an unwanted ther-
mocouple effect will occur.
At this connection, this could be the connector on a PCB, the
thermocouple wiring forms a second thermocouple with the
connector. This second thermocouple disturbs the measure-
ments from the intended thermocouple.
Using an isothermal block as a reference enables correction
for this unwanted thermocouple effect. An isothermal block is
a good heat conductor. This means that the two thermocouple
connections both have the same temperature. The tempera-
ture of the isothermal block can be measured, and thereby
the temperature of the thermocouple connections. This is
usually called the cold junction reference temperature.
In the example, an LM35 is used to measure this temperature.
This semiconductor temperature sensor can accurately mea-
sure temperatures from 55°C to 150°C.
The two channel ADC in this example also converts the signal
from the LM35 to a digital signal. Now the microprocessor can
compensate the amplified thermocouple signal, for the un-
wanted thermocouple effect.
20202161
FIGURE 9. Thermocouple Read Out Circuit
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMV854MTX/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 |
| LMV861 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:30 MHz Low Power CMOS, EMI Hardened Operational Amplifiers |
| LMV861MG | 制造商:Texas Instruments 功能描述:OP Amp Single GP R-R O/P 5.5V 5-Pin SC-70 T/R 制造商:Rochester Electronics LLC 功能描述: |
| LMV861MG/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 |
| LMV861MG/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
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