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MPX7050GP Datasheet(PDF) 3 Page - Motorola, Inc |
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MPX7050GP Datasheet(HTML) 3 Page - Motorola, Inc |
3 / 10 page MPX7050 SERIES 3 Motorola Sensor Device Data 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. Motorola’s specified pressure sensor linearities are based on the end point straight line method measured at the midrange pressure. Figure 2. Linearity Specification Comparison LEAST SQUARE DEVIATION PRESSURE (% FULLSCALE) 0 50 100 END POINT STRAIGHT LINE FIT EXAGGERATED PERFORMANCE CURVE LEAST SQUARES FIT STRAIGHT LINE DEVIATION OFFSET ON–CHIP TEMPERATURE COMPENSATION and CALIBRATION Figure 3 shows the output characteristics of the MPX7050 series at 25 °C. The output is directly proportional to the dif- ferential pressure and is essentially a straight line. The effects of temperature on Full Scale Span and Offset are very small and are shown under Operating Characteristics. Figure 3. Output versus Pressure Differential Figure 4. Cross–Sectional Diagram (not to scale) SILICONE DIE COAT WIRE BOND LEAD FRAME DIE STAINLESS STEEL METAL COVER EPOXY CASE RTV DIE BOND P1 P2 DIFFERENTIAL/GAUGE ELEMENT 40 35 30 25 20 15 10 5 0 –5 0 12.5 1.83 25 3.63 37.5 5.44 50 7.3 SPAN RANGE (TYP) OFFSET (TYP) kPa PSI VS = 10 Vdc TA = 25°C P1 > P2 MAX TYP MIN Figure 4 illustrates the differential or gauge configuration in the basic chip carrier (Case 344–15). A silicone gel iso- lates the die surface and wire bonds from the environment, while allowing the pressure signal to be transmitted to the sil- icon diaphragm. The MPX7050 series pressure sensor operating charac- teristics 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 perfor- mance and long term reliability. Contact the factory for in- formation regarding media compatibility in your application. |
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