ADXL335(2008) Ver la hoja de datos (PDF) - Analog Devices

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ADXL335
(Rev.:2008)

Small, Low Power, 3-Axis ±3 g Accelerometer

Analog Devices 

ADXL335

Preliminary Technical Data

The ADXL335 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 120 μg/√Hz, while at

VS = 2 V, the X- and Y-axis noise density is typically 270 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 ADXL335 is

approximately −275 mV for the X-axis, +275 mV for the Y-axis,

and −100 mV for the Z-axis.

XOUT = –1g

YOUT = 0g

ZOUT = 0g

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

TOP

AX

Figure 5. Axes of Acceleration Sensitivity, Corresponding Output Voltage

Increases When Accelerated Along the Sensitive Axis

XOUT = 0g

YOUT = 1g

ZOUT = 0g

TOP

TOP

TOP

XOUT = 0g

YOUT = –1g

ZOUT = 0g

GRAVITY

TOP

XOUT = 1g

YOUT = 0g

ZOUT = 0g

TOP

XOUT = 0g

YOUT = 0g

ZOUT = 1g

Figure 6. Output Response vs. Orientation to Gravity

XOUT = 0g

YOUT = 0g

ZOUT = –1g

Rev. PrA | Page 8 of 11

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