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ADXL50JH Datasheet(Arkusz danych) 4 Page - Analog Devices

Numer części ADXL50JH
Szczegółowy opis  Monolithic Accelerometer With Signal Conditioning
Pobierz  16 Pages
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Producent  AD [Analog Devices]
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ADXL50
–4–
REV. B
Polarity of the Acceleration Output
The polarity of the ADXL50 output is shown in the Figure 1.
When oriented to the earth’s gravity (and held in place), the
ADXL50 will experience an acceleration of +1 g. This corre-
sponds to a change of approximately +19 mV at the VPR output
pin. Note that the polarity will be reversed to a negative going
signal at the buffer amplifier output VOUT, due to its inverting
configuration.
Mounting Considerations
There are three main causes of measurement error when using
accelerometers. The first two are alignment and transverse sen-
sitivity errors. The third source of error is due to resonances or
vibrations of the sensor in its mounting fixture.
Errors Due to Misalignment
The ADXL50 is a sensor designed to measure accelerations that
result from an applied force. Because these forces act on the
sensor in a vector manner, the alignment of the sensor to the
force to be measured may be critical.
The ADXL50 responds to the component of acceleration on its
sensitive X axis. Figures 2a and 2b show the relationship be-
tween the sensitive “X” axis and the transverse “Z” and “Y”
axes as they relate to the TO-100 package.
Figure 2c describes a three dimensional acceleration vector
(AXYZ) which might act on the sensor, where AX is the compo-
nent of interest. To determine AX, first, the component of accel-
eration in the XY plane (AXY) is found using the cosine law:
AXY = AXYZ (cos
θ
XY) then
AX = AXY (cos
θ
X)
Therefore: Typical VPR = 19 mV/g (AXYZ) (cos
θ
XY) cos
θ
X
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 ADXL50 output at a
reduced amplitude.
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 50 g
θ
X
at Output
Applied Acceleration
0
100%
50 (On Axis)
1
°
99 98%
49.99
2
°
99.94%
49.97
3
°
99.86%
49.93
5
°
99.62%
49.81
10
°
98.48%
49.24
30
°
86.60%
43.30
45
°
70.71%
35.36
60
°
50.00%
25.00
80
°
17.36%
8.68
85
°
8.72%
4.36
87
°
5.25%
2.63
88
°
3.49%
1.75
89
°
1.7%
0.85
90
°
0%
0.00 (Transverse Axis)
+1g
TAB
PIN 5
Figure 1. Output Polarity at VPR
Z
Z
X
TRANSVERSE Z AXIS
SENSITIVE (X) AXIS
SIDE VIEW
X
TAB
PIN 5
Figure 2a. Sensitive X and Transverse Z Axis
TRANSVERSE Y AXIS
TOP VIEW
Y
X
Y
SENSITIVE (X) AXIS
X
TAB
PIN 5
Figure 2b. Sensitive X and Transverse Y Axis
θx
θxy
Y Axis
X Axis
Axy
Ax
Axyz
–Z Axis
Figure 2c. A Vector Analysis of an Acceleration Acting
Upon the ADXL50 in Three Dimensions




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