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ADXL05 数据表(PDF) 6 Page - Analog Devices |
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ADXL05 数据表(HTML) 6 Page - Analog Devices |
6 / 20 page ADXL05 REV. B –6– package. Figure 2c describes a three dimensional acceleration vector (AXYZ) which might act on the sensor, where AX is the component of interest. To determine AX, first, the component of acceleration in the XY plane (AXY) is found using the cosine law: AXY = AXYZ (cos θ XY) then AX = AXY (cos θ X) Therefore: Nominal VPR = 200 mV/g (AXYZ) (cos θ XY) cos θ X Axyz –Z AXIS X AXIS Y AXIS Axy Ax θxy θx Figure 2c. A Vector Analysis of an Acceleration Acting Upon the ADXL05 in Three Dimensions Note that an ideal sensor will react to forces along or at angles to its sensitive axis but will reject signals from its various trans- verse axes, i.e., those exactly 90 ° from the sensitive “X” axis. But even an ideal sensor will produce output signals if the trans- verse signals are not exactly 90 ° to the sensitive axis. An accel- eration that is acting on the sensor from a direction different from the sensitive axis will show up at the ADXL05 output at a reduced amplitude. 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 ADXL05’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. Table I. Ideal Output Signals for Off Axis Applied Accelerations Disregarding Device Alignment and Transverse Sensitivity Errors % of Signal Appearing Output in gs for a 5 g θ X at Output Applied Acceleration 0 100% 5.000 (On Axis) 1 ° 99.98% 4.999 2 ° 99.94% 4.997 3 ° 99.86% 4.993 5 ° 99.62% 4.981 10 ° 98.48% 4.924 30 ° 86.60% 4.330 45 ° 70.71% 3.536 60 ° 50.00% 2.500 80 ° 17.36% 0.868 85 ° 8.72% 0.436 87 ° 5.25% 0.263 88 ° 3.49% 0.175 89 ° 1.7% 0.085 90 ° 0% 0.000 (Transverse Axis) Mounting Fixture Resonances A common source of error in acceleration sensing is resonance of the mounting fixture. For example, the circuit board that the ADXL05 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 ADXL05 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 (refer to Analog Devices Application Note AN-379). 10 90 100 0% 0.5ms Figure 3. 500 g Shock Overload Recovery. Top Trace, PCB Reference Accelerometer Output: 500 g/Vertical Division. Bottom Trace, ADXL05 Output at VPR |
类似零件编号 - ADXL05 |
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类似说明 - ADXL05 |
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