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MPXM2202DT1 Datasheet(PDF) 4 Page - Freescale Semiconductor, Inc |
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MPXM2202DT1 Datasheet(HTML) 4 Page - Freescale Semiconductor, Inc |
4 / 9 page MPXM2202 Sensors 4 Freescale Semiconductor LINEARITY Linearity refers to how well a transducer's output follows the equation: VOUT = VOFF + sensitivity x P over the operating pressure range. There are two basic methods for calculating nonlinearity: (1) end point straight line fit (see Figure 2) or (2) a least squares best line fit. While a least squares fit gives the “best case” linearity error (lower numerical value), the calculations required are burdensome. Conversely, an end point fit will give the “worst case” error (often more desirable in error budget calculations) and the calculations are more straightforward for the user. The specified pressure sensor linearities are based on the end point straight line method measured at the midrange pressure. Figure 2. Linearity Specification Comparison ON-CHIP TEMPERATURE COMPENSATION AND CALIBRATION Figure 3 shows the minimum, maximum and typical output characteristics of the MPXM2202 series at 25 °C. The output is directly proportional to the differential pressure and is es- sentially a straight line. A silicone gel isolates the die surface and wire bonds from the environment, while allowing the pressure signal to be transmitted to the silicon diaphragm. Figure 3. Output versus Pressure Differential Pressure(% Fullscale) 050 100 End Point Straight Line Fit Exaggerated Performance Curve Least Squares Fit Least Square Deviation Straight Line Deviation Offset Least Square Deviation kPa PSI 40 35 30 25 15 10 5 0 -5 050 7.25 100 14.5 150 21.75 200 29 20 MAX TYP MIN Offset (TYP) Span Range (TYP) 25 75 125 175 VS = 10 Vdc TA = 25°C |
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