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ADXL250AQC Datenblatt(PDF) 4 Page - Analog Devices |
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ADXL250AQC Datenblatt(HTML) 4 Page - Analog Devices |
4 / 15 page –4– ADXL150/ADXL250 REV. 0 Zero g Bias Level: The output voltage of the ADXL150/ ADXL250 when there is no acceleration (or gravity) acting upon the axis of sensitivity. The output offset is the difference between the actual zero g bias level and (VS/2). Polarity of the Acceleration Output The polarity of the ADXL150/ADXL250 output is shown in Figure 1. When its sensitive axis is oriented to the earth’s gravity (and held in place), it will experience an acceleration of +1 g. This corresponds to a change of approximately +38 mV at the output pin. Note that the polarity will be reversed if the package is rotated 180 °. The figure shows the ADXL250 oriented so that its “X” axis measures +1 g. If the package is rotated 90 ° clock- wise (Pin 14 up, Pin 1 down), the ADXL250’s “Y” axis will now measure +1 g. 14 1 7 8 AX ADXL150 14 1 7 8 AX ADXL250 AY Figure 2. Output Polarity Acceleration Vectors The ADXL150/ADXL250 is a sensor designed to measure accelerations that result from an applied force. It responds to the component of acceleration on its sensitive X axis (ADXL150) or on both the “X” and “Y” axis (ADXL250). GLOSSARY OF TERMS Acceleration: Change in velocity per unit time. Acceleration Vector: Vector describing the net acceleration acting upon the ADXL150/ADXL250. g: A unit of acceleration equal to the average force of gravity occurring at the earth’s surface. A g is approximately equal to 32.17 feet/s 2 or 9.807 meters/s2. Nonlinearity: The maximum deviation of the ADXL150/ ADXL250 output voltage from a best fit straight line fitted to a plot of acceleration vs. output voltage, calculated as a % of the full-scale output voltage (at 50 g). Resonant Frequency: The natural frequency of vibration of the ADXL150/ADXL250 sensor’s central plate (or “beam”). At its resonant frequency of 24 kHz, the ADXL150/ADXL250’s moving center plate has a slight peak in its frequency response. Sensitivity: The output voltage change per g unit of accelera- tion applied, specified at the VOUT pin in mV/g. Total Alignment Error: Net misalignment of the ADXL150/ ADXL250’s on-chip sensor and the measurement axis of the application. This error includes errors due to sensor die align- ment to the package, and any misalignment due to installation of the sensor package in a circuit board or module. Transverse Acceleration: Any acceleration applied 90 ° to the axis of sensitivity. Transverse Sensitivity Error: The percent of a transverse acceleration that appears at VOUT. Transverse Axis: The axis perpendicular (90 °) to the axis of sensitivity. |
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