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參數資料
| 型號： | ADXL320EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Small and Thin 5 g Accelerometer |
| 中文描述： | 小而薄的5克加速度 |
| 文件頁數： | 13/16頁 |
| 文件大小： | 412K |
| 代理商： | ADXL320EB |
ADXL320
Peak-to-peak noise values give the best estimate of the
uncertainty in a single measurement. Table 7 gives the typical
noise output of the ADXL320 for various C
X
and C
Y
values.
Table 7. Filter Capacitor Selection (C
X
, C
Y
)
Bandwidth
(Hz)
(μF)
(m
g
)
10
0.47
1.0
50
0.1
2.25
100
0.047
3.2
500
0.01
7.1
USE WITH OPERATING VOLTAGES OTHER THAN 3 V
The ADXL320 is tested and specified at V
S
= 3 V; however, it can
be powered with V
S
as low as 2.4 V or as high as 5.25 V. Note
that some performance parameters change as the supply voltage
is varied.
Rev. 0 | Page 13 of 16
C
X
, C
Y
RMS Noise
Peak-to-Peak Noise
Estimate (
mg
)
6
13.5
18.9
42.8
The ADXL320 output is ratiometric, so the output sensitivity (or
scale factor) varies proportionally to supply voltage. At V
S
= 5 V,
the output sensitivity is typically 312 mV/
g
. At V
S
= 2.4 V, the
output sensitivity is typically 135 mV/
g
.
The zero
g
bias output is also ratiometric, so the zero
g
output is
nominally equal to V
S
/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 V
S
= 5 V, the noise
density is typically 150 μ
g
/√Hz, while at V
S
= 2.4 V, the noise
density is typically 300 μ
g
/√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, the self-test response in volts is
roughly proportional to the cube of the supply voltage. For
example, at V
S
= 5 V, the self-test response for the ADXL320 is
approximately 250 mV. At V
S
= 2.4 V, the self-test response is
approximately 25 mV.
The supply current decreases as the supply voltage decreases.
Typical current consumption at V
S
= 5 V is 750 μA, and typical
current consumption at V
S
= 2.4 V is 350 μA.
USE AS A DUAL-AXIS TILT SENSOR
Tilt measurement is one of the ADXL320’s most popular
applications. 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, when it 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 (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 m
g
per degree of tilt. At 45°, its output changes at
only 12.2 m
g
per degree of tilt, and resolution declines.
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 both a roll axis and 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
PITCH
=
ASIN
(
A
X
/1
g
)
ROLL
=
ASIN
(
A
Y
/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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