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參數(shù)資料
| 型號： | ADXL321EB |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | Small and Thin 18 g Accelerometer |
| 中文描述： | 小而薄的18克加速度 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大?。?/td> | 379K |
| 代理商： | ADXL321EB |
ADXL321
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 ADXL321 for various C
X
and C
Y
values.
Table 7. Filter Capacitor Selection (C
X
, C
Y
)
Rev. 0 | Page 13 of 16
Bandwidth
(Hz)
10
50
100
500
USE WITH OPERATING VOLTAGES OTHER THAN 3 V
The ADXL321 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 6 V. Note that
some performance parameters change as the supply voltage is
varied.
C
X
, C
Y
(μF)
0.47
0.1
0.047
0.01
RMS Noise
(m
g
)
1.3
2.9
4
9.1
Peak-to-Peak
Noise Estimate
(
mg
)
7.8
17.4
24
54.6
The ADXL321 output is ratiometric, so the sensitivity (or scale
factor) varies proportionally to supply voltage. At V
S
= 5 V, the
sensitivity is typically 100 mV/
g
. At V
S
= 2.4 V, the sensitivity is
typically 45 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 190 μ
g
/√Hz, while at V
S
= 2.4 V, the noise
density is typically 400 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 ADXL321 is
approximately 80 mV. At V
S
= 2.4 V, the self-test response is
approximately 8 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
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
= arcsine(
A
X
/1
g
)
ROLL
= arcsine(
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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| ADXL321JCP | 功能描述:IC ACCELEROMETER DUAL-AX 16LFCSP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 加速計 系列:- 標(biāo)準(zhǔn)包裝:1 系列:SCA1000 軸:X，Y 加速范圍:±1.7g 靈敏度:1.2V/g 電源電壓:4.75 V ~ 5.25 V 輸出類型:數(shù)字 帶寬:50±30Hz 接口:SPI 安裝類型:表面貼裝 封裝/外殼:12-SMD 供應(yīng)商設(shè)備封裝:12-SMD 其它名稱:551-1007-1 |
| ADXL321JCP | 制造商:Analog Devices 功能描述:Accelerometer |
| ADXL321JCP-REEL | 功能描述:IC ACCELEROMETER DUAL 16LFCSP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 加速計 系列:- 標(biāo)準(zhǔn)包裝:1 系列:SCA1000 軸:X，Y 加速范圍:±1.7g 靈敏度:1.2V/g 電源電壓:4.75 V ~ 5.25 V 輸出類型:數(shù)字 帶寬:50±30Hz 接口:SPI 安裝類型:表面貼裝 封裝/外殼:12-SMD 供應(yīng)商設(shè)備封裝:12-SMD 其它名稱:551-1007-1 |
| ADXL321JCP-REEL7 | 功能描述:IC ACCELEROMETER DUAL 16LFCSP RoHS:是 類別:傳感器，轉(zhuǎn)換器 >> 加速計 系列:- 標(biāo)準(zhǔn)包裝:1 系列:SCA1000 軸:X，Y 加速范圍:±1.7g 靈敏度:1.2V/g 電源電壓:4.75 V ~ 5.25 V 輸出類型:數(shù)字 帶寬:50±30Hz 接口:SPI 安裝類型:表面貼裝 封裝/外殼:12-SMD 供應(yīng)商設(shè)備封裝:12-SMD 其它名稱:551-1007-1 |
| ADXL322 | 制造商:AD 制造商全稱:Analog Devices 功能描述:Small and Thin +-2 g Accelerometer |
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