ADIS16501SLASHPCBZ datasheet(15/45 Pages) AD

15 / 45 page

Data Sheet

ADIS16501

TERMINOLOGY

analog.com

Rev. B | 15 of 45

Figure 24. Allan Variance Plot Example

Inertial Data Format

Inertial data format is the digital representation of the angular

rate or acceleration information output by the ADIS16501. Both

the angular rate and acceleration information are transmitted as

16-bit (or 24-bit), twos complement values. Nominal sensitivity and

nominal scale factor define the relationship for converting from the

digital 16-bit (or 24-bit) value to either acceleration or angular rate.

Nominal Sensitivity

Nominal sensitivity is the slope of the line of best fit for the angular

rate and acceleration transfer functions, as measured across the

output full-scale range (FSR) of the ADIS16501. The sensitivity

defines the change in output (LSB) per unit change of input (g or

°/sec).

Figure 25. Nominal Sensitivity Slope

Nominal Scale Factor

The nominal scale factor is the inverse of the nominal sensitivity.

It is the slope of the line of best fit for the angular rate and

acceleration transfer functions, as measured across the output FSR

of the ADIS16501. The nominal scale factor describes the change

in input (g or °/sec) per change in the device output (LSB).

Sensitivity/Scale Factor Tolerance

The sensitivity/scale factor tolerance is the allowable variation be-

tween the applied angular rate or acceleration and the digital output

(LSB). The acceleration sensitivity can be validated at inputs of

±1 g, and the angular rate sensitivity can be validated at any input

greater than ±50°/sec.

Acceleration =

ACCMEASgIN=+1g +ACCMEASgIN=−1g

Gyroscope =

ΩMEASΩIN=+50°/sec −ΩMEASΩIN=−50°/sec

100°/sec

Figure 26. Sensitivity/Scale Factor Transfer Function

Cross Axis Sensitivity

Cross axis sensitivity is the measured output of the device in

response to input stimuli orthogonal to the measurement axis. It is

measured as a percentage of the applied orthogonal acceleration or

rotation rate. All stimulus axes are defined relative to the package

body as follows:

Gyroscope= ΩMEASΩZ

ΩXor ΩY

×100%

Acceleration = ACCMEASgX

gYor gY

×100%

where:

ΩMEAS (ΩZ) is the measured angular rate.

ΩX (or ΩY) is the applied pitch or roll rate.

ACCMEAS (gX) is the measured x-axis acceleration.

gY (or gZ) is the applied y- or z-axis acceleration.

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