EVAL-ADXL330Z1 AD [Analog Devices], EVAL-ADXL330Z1 Datasheet - Page 13

• Manufacturer Part Number: EVAL-ADXL330Z1
• Manufacturer: AD [Analog Devices]

The ADXL330 output is ratiometric, therefore, the output
sensitivity (or scale factor) varies proportionally to the
supply voltage. At V
typically 360 mV/g. At V
typically 195 mV/g.
The zero g bias output is also ratiometric, so the zero g output is
nominally equal to V
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
X- and Y-axis noise density is typically 230 μg/√Hz, while at
V
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
approximately −275 mV for the X-axis, +275 mV for the Y-axis,
and −100 mV for the Z-axis.
S
= 2 V, the X- and Y-axis noise density is typically 350 μg/√Hz.
S
= 3.6 V, the self test response for the ADXL330 is
S
S
= 3.6 V, the output sensitivity is
/2 at all supply voltages.
S
= 2 V, the output sensitivity is
X
Y
Z
OUT
OUT
OUT
= 0g
= 0g
= 1g
TOP
S
Figure 32. Output Response vs. Orientation to Gravity
= 3.6 V, the
X
Y
Z
X
Y
Z
OUT
OUT
OUT
OUT
OUT
OUT
TOP
TOP
= 0g
= 1g
= 0g
= –1g
= 0g
= 0g
Rev. A | Page 13 of 16
TOP
X
Y
Z
X
Y
Z
OUT
OUT
OUT
OUT
OUT
OUT
At V
the X-axis, +60 mV for the Y-axis, and −25 mV for the Z-axis.
The supply current decreases as the supply voltage decreases.
Typical current consumption at V
typical current consumption at V
AXES OF ACCELERATION SENSITIVITY
Figure 31. Axes of Acceleration Sensitivity, Corresponding Output Voltage
= 0g
= 0g
= –1g
= 1g
= 0g
= 0g
S
= 2 V, the self test response is approximately −60 mV for
A
Z
Increases When Accelerated Along the Sensitive Axis
GRAVITY
X
Y
Z
OUT
OUT
OUT
= –1g
= 0g
= 0g
A
Y
S
S
= 2 V is 200 μA.
= 3.6 V is 375 μA, and
ADXL330
A
X