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5962-01-179-4667 参数 Datasheet PDF下载

5962-01-179-4667图片预览
型号: 5962-01-179-4667
PDF下载: 下载PDF文件 查看货源
内容描述: [IC IC,TEMPERATURE SENSOR,BIPOLAR/JFET,CAN,3PIN,METAL, Analog IC:Other]
分类和应用:
文件页数/大小: 16 页 / 387 K
品牌: ADI [ ADI ]
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AD590  
+
5V  
+
EXPLANATION OF TEMPERATURE SENSOR  
SPECIFICATIONS  
AD590  
+
The way in which the AD590 is specified makes it easy to apply  
it in a wide variety of applications. It is important to understand  
the meaning of the various specifications and the effects of the  
supply voltage and thermal environment on accuracy.  
R
100  
V
= 1mV/K  
T
950Ω  
Figure 9. One Temperature Trim  
The AD590 is a PTAT1 current regulator. That is, the output  
current is equal to a scale factor times the temperature of the  
sensor in degrees Kelvin. This scale factor is trimmed to 1 μA/K  
at the factory, by adjusting the indicated temperature (that is,  
the output current) to agree with the actual temperature. This is  
done with 5 V across the device at a temperature within a few  
degrees of 25°C (298.2K). The device is then packaged and  
tested for accuracy over temperature.  
ERROR VS. TEMPERATURE: WITH CALIBRATION  
ERROR TRIMMED OUT  
Each AD590 is tested for error over the temperature range with  
the calibration error trimmed out. This specification could also  
be called the variance from PTAT, because it is the maximum  
difference between the actual current over temperature and a  
PTAT multiplication of the actual current at 25°C. This error  
consists of a slope error and some curvature, mostly at the  
temperature extremes. Figure 10 shows a typical AD590K  
temperature curve before and after calibration error trimming.  
CALIBRATION ERROR  
At final factory test, the difference between the indicated  
temperature and the actual temperature is called the calibration  
error. Since this is a scale factory error, its contribution to the  
total error of the device is PTAT. For example, the effect of the  
1°C specified maximum error of the AD590L varies from 0.73°C at  
–55°C to 1.42°C at 150°C. Figure 8 shows how an exaggerated  
calibration error would vary from the ideal over temperature.  
2
BEFORE  
CALIBRATION  
TRIM  
CALIBRATION  
ERROR  
0
ACTUAL  
TRANSFER  
FUNCTION  
AFTER  
CALIBRATION  
TRIM  
I
ACTUAL  
IDEAL  
TRANSFER  
FUNCTION  
CALIBRATION  
ERROR  
–2  
–55  
150  
298.2  
TEMPERATURE (°C)  
Figure 10. Effect to Scale Factor Trim on Accuracy  
ERROR VS. TEMPERATURE: NO USER TRIMS  
Using the AD590 by simply measuring the current, the total  
error is the variance from PTAT, described above, plus the effect  
of the calibration error over temperature. For example, the  
AD590L maximum total error varies from 2.33°C at –55°C to  
3.02°C at 150°C. For simplicity, only the large figure is shown  
on the specification page.  
298.2  
TEMPERATURE (°K)  
Figure 8. Calibration Error vs. Temperature  
The calibration error is a primary contributor to the maximum  
total error in all AD590 grades. However, because it is a scale  
factor error, it is particularly easy to trim. Figure 9 shows the  
most elementary way of accomplishing this. To trim this circuit,  
the temperature of the AD590 is measured by a reference  
temperature sensor and R is trimmed so that VT = 1 mV/K at  
that temperature. Note that when this error is trimmed out at  
one temperature, its effect is zero over the entire temperature  
range. In most applications, there is a current-to-voltage  
conversion resistor (or, as with a current input ADC, a  
NONLINEARITY  
Nonlinearity as it applies to the AD590 is the maximum  
deviation of current over temperature from a best-fit straight  
line. The nonlinearity of the AD590 over the −55°C to +150°C  
range is superior to all conventional electrical temperature  
sensors such as thermocouples, RTDs, and thermistors. Figure 11  
shows the nonlinearity of the typical AD590K from Figure 10.  
reference) that can be trimmed for scale factor adjustment.  
1 T(°C) = T(K) − 2ꢀ3.2. Zero on the Kelvin scale is absolute zero; there is no  
lower temperature.  
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