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ADXL330 Datasheet(PDF) 13 Page - Analog Devices |
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ADXL330 Datasheet(HTML) 13 Page - Analog Devices |
13 / 16 page ADXL330 Rev. A | Page 13 of 16 The ADXL330 output is ratiometric, therefore, the output sensitivity (or scale factor) varies proportionally to the supply voltage. At VS = 3.6 V, the output sensitivity is typically 360 mV/g. At VS = 2 V, the output sensitivity is typically 195 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 = 3.6 V, the X- and Y-axis noise density is typically 230 μg/√Hz, while at VS = 2 V, the X- and Y-axis noise density is typically 350 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 = 3.6 V, the self test response for the ADXL330 is approximately −275 mV for the X-axis, +275 mV for the Y-axis, and −100 mV for the Z-axis. At VS = 2 V, the self test response is approximately −60 mV for 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 VS = 3.6 V is 375 μA, and typical current consumption at VS = 2 V is 200 μA. AXES OF ACCELERATION SENSITIVITY AZ AY AX TOP Figure 31. Axes of Acceleration Sensitivity, Corresponding Output Voltage Increases When Accelerated Along the Sensitive Axis XOUT = –1g YOUT = 0g ZOUT = 0g GRAVITY XOUT = 0g YOUT = 1g ZOUT = 0g XOUT = 0g YOUT = –1g ZOUT = 0g XOUT = 1g YOUT = 0g ZOUT = 0g XOUT = 0g YOUT = 0g ZOUT = 1g XOUT = 0g YOUT = 0g ZOUT = –1g TOP TOP TOP TOP TOP Figure 32. Output Response vs. Orientation to Gravity |
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