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ADXL204EB датащи(PDF) 11 Page - Analog Devices |
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ADXL204EB датащи(HTML) 11 Page - Analog Devices |
11 / 12 page ADXL204 Rev. A | Page 11 of 12 Peak-to-peak noise values give the best estimate of the uncertainty in a single measurement and is estimated by 6 × rms. Table 8 gives the typical noise output of the ADXL204 for various CX and CY values. Table 8. Filter Capacitor Selection (CX, CY) Bandwidth(Hz) CX, CY (μF) RMS Noise (mg) Peak-to-Peak Noise Estimate (mg) 10 0.47 0.7 4.1 50 0.1 1.5 9.1 100 0.047 2.2 12.9 500 0.01 4.8 28.8 USING THE ADXL204 WITH OPERATING VOLTAGES OTHER THAN 3.3 V The ADXL204 is tested and specified at VS = 3.3 V; however, it can be powered with VS as low as 3 V or as high as 6 V. Some performance parameters change as the supply voltage is varied. The ADXL204 output is ratiometric, so the output sensitivity, or scale factor, varies proportionally to supply voltage. At VS = 3 V, the output sensitivity is typically 560 mV/g. At VS = 5 V, the output sensitivity is typically 1000 mV/g. The zero g bias output is also ratiometric, so the zero g output is nominally equal to VS/2 at all supply voltages. The output noise is not ratiometric but is absolute in volts; therefore, the noise density decreases as the supply voltage increases. This is because the scale factor (mV/g) increases while the noise voltage remains constant. At VS = 3 V, the noise density is typically 190 μg/√Hz. At VS = 5 V, the noise density is typically 110 μg/√Hz. Self-test response in g is roughly proportional to the square of the supply voltage. However, when ratiometricity of sensitivity is factored in with supply voltage, self-test response in volts is roughly proportional to the cube of the supply voltage. This means at VS = 3 V, the self-test response is approximately equivalent to 150 mV, or equivalent to 270 mg (typical). At VS = 5 V, the self-test response is approximately equivalent to 750 mV, or equivalent to 750 mg (typical). The supply current decreases as the supply voltage decreases. Typical current consumption at VDD = 5 V is 750 μA. USING THE ADXL204 AS A DUAL-AXIS TILT SENSOR One of the most popular applications of the ADXL204 is tilt measurement. An accelerometer uses the force of gravity as an input vector to determine the orientation of an object in space. An accelerometer is most sensitive to tilt when its sensitive axis is perpendicular to the force of gravity, that is, parallel to the earth’s surface. At this orientation, its sensitivity to changes in tilt is highest. When the accelerometer is oriented on axis to gravity, that is, near its +1 g or –1 g reading, the change in output acceleration per degree of tilt is negligible. When the accelerometer is perpendicular to gravity, its output changes nearly 17.5 mg per degree of tilt. At 45°, its output changes at only 12.2 mg per degree and resolution declines. Dual-Axis Tilt Sensor: Converting Acceleration to Tilt When the accelerometer is oriented, so both its x-axis and y-axis are parallel to the earth’s surface, it can be used as a 2-axis tilt sensor with a roll axis and a pitch axis. Once the output signal from the accelerometer is converted to an acceleration that varies between –1 g and +1 g, the output tilt in degrees is calculated as: PITCH = ASIN(AX/1 g) ROLL = ASIN(AY/1 g) Be sure to account for overranges. It is possible for the accelerometers to output a signal greater than ±1 g due to vibration, shock, or other accelerations. |
Аналогичный номер детали - ADXL204EB |
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Аналогичное описание - ADXL204EB |
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