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參數(shù)資料
| 型號(hào)： | LMP90079MHX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, PDSO28 |
| 封裝： | LEAD FREE, PLASTIC, MO-153, TSSOP-28 |
| 文件頁數(shù)： | 40/62頁 |
| 文件大?。?/td> | 1721K |
| 代理商： | LMP90079MHX/NOPB |
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17.6 EXAMPLE APPLICATIONS
17.6.1 3–Wire RTD
30169752
FIGURE 37. Topology #1: 3-wire RTD Using 2 Current Sources
Figure 37 shows the first topology for a 3-wire resistive tem-
perature detector (RTD) application. Topology #1 uses two
excitation current sources, IB1 and IB2, to create a differential
voltage across VIN0 and VIN1. As a result of using both IB1
and IB2, only one channel (VIN0-VIN1) needs to be mea-
sured. As shown in Equation 2, the equation for this channel
is IB1 x (RTD – RCOMP) assuming that RLINE1 = RLINE2.
Equation 2 — VIN Equation for Topology #1
The PT-100 changes linearly from 100 Ohm at 0°C to
146.07 Ohm at 120°C. If desired, choose a suitable compen-
sating resistor (RCOMP) so that VIN can be virtually 0V at any
desirable temperature. For example, if RCOMP = 100 Ohm,
then at 0°C, VIN = 0V and thus a higher gain can be used.
The advantage of this circuit is its ratiometric configuration,
where VREF = (IB1 + IB2) x (RREF). Equation 3 shows that
a ratiometric configuration eliminates IB1 and IB2 from the
output equation, thus increasing the overall performance.
Equation 3 — ADC_DOUT Showing IB1 & IB2 Elimination
45
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LMP90080/LMP90079/LMP90078/LMP90077
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| LMP90080MHE/NOPB | SPECIALTY ANALOG CIRCUIT, PDSO28 |
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| LMV431IMDC | 1-OUTPUT TWO TERM VOLTAGE REFERENCE, 1.24 V, UUC |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMP90080 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Sensor AFE System: Multi-Channel, Low-Power 16-Bit |
| LMP90080MH/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| LMP90080MHE/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| LMP90080MHX/NOPB | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
| LMP90080QMH/NOPB | 制造商:Texas Instruments 功能描述:IC AFE 16BIT 214.6SPS 28TSSOP |
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