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ADXL50 Arkusz danych(PDF) 5 Page - Analog Devices |
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ADXL50 Arkusz danych(HTML) 5 Page - Analog Devices |
5 / 16 page ADXL50 REV. B –5– Sensitivity: The output voltage change per g unit of accelera- tion applied, specified at the VPR pin in mV/g. Sensitive Axis (X): The most sensitive axis of the accelerom- eter sensor. Defined by a line drawn between the package tab and Pin 5 in the plane of the pin circle. See Figures 2a and 2b. Sensor Alignment Error: Misalignment between the ADXL50’s on-chip sensor and the package axis, defined by Pin 5 and the package tab. Total Alignment Error: Net misalignment of the ADXL50’s on-chip sensor and the measurement axis of the application. This error includes errors due to sensor die alignment 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 ac- celeration that appears at the VPR output. For example, if the transverse sensitivity is 1%, then a +10 g transverse acceleration will cause a 0.1 g signal to appear at VPR (1% of 10 g). Trans- verse sensitivity can result from a sensitivity of the sensor to transverse forces or from misalignment of the internal sensor to its package. Transverse Y Axis: The axis perpendicular (90 °) to the pack- age axis of sensitivity in the plane of the package pin circle. See Figure 2. Transverse Z Axis: The axis perpendicular (90 °) to both the package axis of sensitivity and the plane of the package pin circle. See Figure 2. 10 90 100 0% 1V 0.5ms 0.5V Figure 3. 500 g Shock Overload Recovery. Top Trace: ADXL50 Output. Bottom Trace: Reference Accelerometer Output Table I shows the percentage signals resulting from various θ X angles. Note that small errors in alignment have a negligible effect on the output signal. A 1 ° error will only cause a 0.02% error in the signal. Note, however, that a signal coming 1 ° off of the transverse axis (i.e., 89 ° off the sensitive axis) will still con- tribute 1.7% of its signal to the output. Thus large transverse signals could cause output signals as large as the signals of interest. Table I may also be used to approximate the effect of the ADXL50’s internal errors due to misalignment of the die to the package. For example: a 1 degree sensor alignment error will allow 1.7% of a transverse signal to appear at the output. In a nonideal sensor, transverse sensitivity may also occur due to in- herent sensor properties. That is, if the sensor physically moves due to a force applied exactly 90 ° to its sensitive axis, then this might be detected as an output signal, whereas an ideal sensor would reject such signals. In every day use, alignment errors may cause a small output peak with accelerations applied close to the sensitive axis but the largest errors are normally due to large accelerations applied close to the transverse axis. Errors Due to Mounting Fixture Resonances A common source of error in acceleration sensing is resonance of the mounting fixture. For example, the circuit board that the ADXL50 mounts to may have resonant frequencies in the same range as the signals of interest. This could cause the signals measured to be larger than they really are. A common solution to this problem is to dampen these resonances by mounting the ADXL50 near a mounting post or by adding extra screws to hold the board more securely in place. When testing the accelerometer in your end application, it is recommended that you test the application at a variety of fre- quencies in order to ensure that no major resonance problems exist. GLOSSARY OF TERMS Acceleration: Change in velocity per unit time. Acceleration Vector: Vector describing the net acceleration acting upon the ADXL50 (AXYZ). 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 ADXL50 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 (@ 50 g). Resonant Frequency: The natural frequency of vibration of the ADXL50 sensor’s central plate (or “beam”). At its resonant frequency of 24 kHz, the ADXL50’s moving center plate has a peak in its frequency response with a Q of 3 or 4. |
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