ADXL323 データシートの表示（PDF） - Analog Devices
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ADXL323 Datasheet PDF : 16 Pages
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ADXL323
The ADXL323 output is ratiometric; therefore, the output
sensitivity (or scale factor) varies proportionally to the supply
voltage. At VS = 5 V, the output sensitivity is typically 550 mV/g.
At VS = 2 V, the output sensitivity is typically 190 mV/g.
The zero g bias output is also ratiometric, so the zero g output is
nominally equal to VS/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 VS = 5 V, the noise
density is typically 180 μg/√Hz, while at VS = 1.8 V, the noise
density is typically 360 μg/√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 VS = 5 V, the self-test response for the ADXL323 is
approximately −700 mV for the X-axis and +700 mV for the Y-axis.
XOUT = –1g
YOUT = 0g
At VS = 1.8 V, the self-test response is approximately −40 mV
for the X-axis and +40 mV for the Y-axis.
The supply current decreases as the supply voltage decreases.
Typical current consumption at VS = 5 V is 500 μA, and typical
current consumption at VS = 1.8 V is 180 μA.
AXES OF ACCELERATION SENSITIVITY
AY
TOP
AX
Figure 31. Axes of Acceleration Sensitivity, Corresponding Output Voltage
Increases When Accelerated Along the Sensitive Axis
TOP
GRAVITY
XOUT = 0g
YOUT = 1g
TOP
TOP
XOUT = 0g
YOUT = –1g
TOP
XOUT = 1g
YOUT = 0g
TOP
XOUT = 0g
YOUT = 0g
Figure 32. Output Response vs. Orientation to Gravity
XOUT = 0g
YOUT = 0g
Rev. 0 | Page 13 of 16
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