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MPX2053D Datasheet(PDF) 5 Page - Freescale Semiconductor, Inc |
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MPX2053D Datasheet(HTML) 5 Page - Freescale Semiconductor, Inc |
5 / 17 page MPX2053 Sensors 5 Freescale Semiconductor, Inc. Pressure 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 3) 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 3. Linearity Specification Comparison Figure 4 illustrates the differential or gauge configuration in the basic chip carrier (Case 344). 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. The MPX2053 series pressure sensor operating characteristics and internal reliability and qualification tests are based on use of dry air as the pressure media. Media other than dry air may have adverse effects on sensor performance and long term reliability. Contact the factory for information regarding media compatibility in your application. Refer to application note AN3728, for more information regarding media compatibility. Figure 4. Unibody Package — Cross-Sectional Diagram (Not to Scale) Pressure (% Full scale) 0 50 100 End Point Straight Line Fit Exaggerated Performance Least Squares Fit Straight Line OFFSET Least Square Deviation Silicone Die Coat Die P1 P2 Wire Bond Lead Frame RTV Die Bond Epoxy Case Stainless Steel Metal Cover |
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