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ADXL213_15 Datasheet(Arkusz danych) 10 Page - Analog Devices

Numer części ADXL213_15
Szczegółowy opis  Low Cost 1.2 g Dual Axis Accelerometer
Pobierz  12 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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ADXL213
Rev. A | Page 10 of 12
Peak-to-peak noise values give the best estimate of the
uncertainty in a single measurement. Table 6 gives the typical
noise output of the ADXL213 for various CX and CY values.
Table 6. Filter Capacitor Selection (CX, CY)
Bandwidth(Hz)
CX, CY
(μF)
RMS Noise
(mg)
Peak-to-Peak Noise
Estimate (mg)
10
0.47
0.64
3.8
50
0.1
1.4
8.6
100
0.047
2
12
500
0.01
4.5
27.2
USING THE ADXL213 WITH OPERATING
VOLTAGES OTHER THAN 5 V
The ADXL213 is tested and specified at VS = 5 V; however, it
can be powered with VS as low as 3 V or as high as 6 V. Some
perfor-mance parameters will change as the supply voltage is
varied.
The ADXL213 output varies proportionally to supply voltage.
At VS = 3 V, the output sensitivity is typically 28%/g.
The zero g bias output is ratiometric, so the zero g output is
nominally equal to 50% at all supply voltages.
The output noise also varies with supply voltage. At VS = 3 V,
the noise density is typically 200 μg/√Hz.
Self-test response in g is roughly proportional to the square of
the supply voltage. So at VS = 3 V, the self-test response is
equivalent to approximately 270 mg (typical), or 8%.
The supply current decreases as the supply voltage decreases.
Typical current consumption at VDD = 3 V is 450 μA.
USING THE ADXL213 AS A DUAL-AXIS TILT
SENSOR
One of the most popular applications of the ADXL213 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, i.e., 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,
i.e., near its +1 g or –1 g reading, the change in output accelera-
tion 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 and Y axes 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 has been converted to an acceleration
that varies between –1 g and +1 g, the output tilt in degrees is
calculated as follows:
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.




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