MPXM2053D Просмотр технического описания (PDF) - Freescale Semiconductor
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MPXM2053D
Freescale Semiconductor
MPXM2053D Datasheet PDF : 19 Pages
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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.
Pressure
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.
Least Squares Fit
Exaggerated
Performance
Least
Square
Deviation
Straight Line
End Point
Straight Line Fit
OFFSET
0
50
100
Pressure (% Full scale)
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.
Wire Bond
Silicone
Die Coat
Die
P1
Stainless Steel
Metal Cover
Epoxy
Case
Lead Frame
RTV Die
Bond
P2
Figure 4. Unibody Package — Cross-Sectional Diagram (Not to Scale)
Sensors
Freescale Semiconductor
MPX2053
5
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