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MPX2700 Datasheet(PDF) 3 Page - Motorola, Inc |
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MPX2700 Datasheet(HTML) 3 Page - Motorola, Inc |
3 / 10 page MPX2700 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 or (2) a least squares best line fit (see Figure 3). 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 MPX2700 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 Characteris- tics. Figure 3. Output versus Pressure Differential Figure 4. Cross–Section of Differential Pressure Sensor Die in Its Basic Package (Not to Scale) SILICONE DIE COAT WIRE BOND LEAD FRAME DIE STAINLESS STEEL METAL COVER RTV DIE BOND EPOXY CASE P1 P2 50 40 30 20 10 –5 20 140 40 280 60 420 100 700 SPAN RANGE (TYP) OFFSET PSI kPa VS = 10 V TA = 25°C P1 > P2 MAX TYP MIN 0 80 560 Figure 4 shows the cross section of the Motorola MPX pressure sensor die in the chip carrier package. 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. MPX2700 series pressure sensor operating characteristics and internal reli- ability 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. |
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