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ADXL05 Datasheet(PDF) 5 Page - Analog Devices
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ADXL05 Datasheet(HTML) 5 Page - Analog Devices
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Polarity of the Acceleration Output
The polarity of the ADXL05 output is shown in the Figure 1.
When oriented to the earth’s gravity (and held in place), the
ADXL05 will experience an acceleration of +1 g. This corre-
sponds to a change of approximately +200 mV at the V
put pin. Note that the polarity will be reversed to a negative
going signal at the buffer amplifier output V
, due to its
INDICATED POLARITY IS THAT
OCCURRING AT V
Figure 1. Output Polarity at V
Acceleration Vectors in Three Dimensions
The ADXL05 is a sensor designed to measure accelerations that
result from an applied force. The ADXL05 responds to the
component of acceleration on its sensitive X axis. Figures 2a
and 2b show the relationship between the sensitive “X” axis and
the transverse “Z” and “Y” axes as they relate to the TO-100
TRANSVERSE Z AXIS
SENSITIVE (X) AXIS
Figure 2a. Sensitive X and Transverse Z Axis
TRANSVERSE Y AXIS
SENSITIVE (X) AXIS
Figure 2b. Sensitive X and Transverse Y Axis
GLOSSARY OF TERMS
Acceleration: Change in velocity per unit time.
Acceleration Vector: Vector describing the net acceleration
acting upon the ADXL05 (A
g: A unit of acceleration equal to the average force of gravity
occurring at the earth’s surface. A g is approximately equal to
, or 9.807 meters/s
Nonlinearity: The maximum deviation of the ADXL05 output
voltage from a best fit straight line fitted to a plot of acceleration
vs. output voltage, calculated as a % of the full-scale output
voltage (@ 5 g).
Resonant Frequency: The natural frequency of vibration of
the ADXL05 sensor’s central plate (or “beam”). At its resonant
frequency of 12 kHz, the ADXL05’s moving center plate has a
peak in its frequency response with a Q of 3 or 4.
Sensitivity: The output voltage change per g unit of accelera-
tion applied, specified at the V
pin in mV/g.
Sensitive Axis (X): The most sensitive axis of the accelerom-
eter sensor. Defined by a line drawn between the package tab
and Pin 5 in the plane of the pin circle. See Figures 2a and 2b.
Sensor Alignment Error: Misalignment between the
ADXL05’s on-chip sensor and the package axis, defined by
Pin 5 and the package tab.
Total Alignment Error: Net misalignment of the ADXL05’s
on-chip sensor and the measurement axis of the application.
This error includes errors due to sensor die alignment to the
package, and any misalignment due to installation of the sensor
package in a circuit board or module.
Transverse Acceleration: Any acceleration applied 90
° to the
axis of sensitivity.
Transverse Sensitivity Error: The percent of a transverse ac-
celeration that appears at the V
output. For example, if the
transverse sensitivity is 1%, then a +10 g transverse acceleration
will cause a 0.1 g signal to appear at V
(1% of 10 g). Trans-
verse sensitivity can result from a sensitivity of the sensor to
transverse forces or from misalignment of the internal sensor to
Transverse Y Axis: The axis perpendicular (90
°) to the pack-
age axis of sensitivity in the plane of the package pin circle. See
Transverse Z Axis: The axis perpendicular (90
°) to both the
package axis of sensitivity and the plane of the package pin
circle. See Figure 2.
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