ADIS16501SLASHPCBZ datasheet(16/45 Pages) AD

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Data Sheet

ADIS16501

TERMINOLOGY

analog.com

Rev. B | 16 of 45

Nonlinearity

Nonlinearity is the maximum deviation of any sensor data point

(ΩMEAS(Ωn) or ACCMEAS(gn)) from the least squares linear fit of the

sensor data at an equivalent applied angular rate or acceleration.

Nonlinearity is mathematically expressed as

Gyroscope = ΩMEAS(Ωn) – ΩCALC(Ωn)

Acceleration = ACCMEAS(gn) – ACCCALC(gn)

where:

ΩMEAS is the measured angular rate at Ωn.

ΩCALC is the linear fit calculation of the angular rate at Ωn.

ACCMEAS is the measured acceleration at gn.

ACCCALC is the linear fit calculation of acceleration at gn.

For testing across a range of ±125°/sec (gyroscope) or ±2.5 g

(accelerometer), apply the following input stimulus profile:

Ωn = −125°/sec + (n × 2.5)

where n = 0, 1, …, 100.

gn = −2.5 g + (n × 0.05)

where n = 0, 1, …, 100.

For testing across a range of ±500°/sec (gyroscope) or ±14 g

(accelerometer), apply the following input stimulus profile:

Ωn = −500°/sec + (n × 5)

where n = 0, 1, …, 200.

gn = −14 g + (n × 0.2)

where n = 0, 1, …, 100.

Figure 27. Nonlinearity Characteristic

Microlinearity

Microlinearity is the maximum deviation of the gradient between

two neighboring sensor data points as compared to the scale factor

calculated from the least squares linear fit of the sensor data.

Microlinearity is mathematically expressed as

Gyroscope= ΩMEASΩn+1−ΩMEASΩn

ΩSTEP×Sensitivity

×100%

Acceleration= ACCMEASgn+1+ACCMEASgn

gSTEP×Sensitivity

−1

×100%

where:

ΩMEAS is the measured angular rate at a defined Ωn.

ACCMEAS is the measured acceleration at a defined gn.

For testing across a range of ±125°/sec (gyroscope) or ±2.5 g

(accelerometer), apply the following input stimulus profile:

ΩSTEP = 5°/sec

gSTEP = 100 mg

Ωn = −125°/sec + (n × ΩSTEP)

where n = 0, 1, …, 50.

gn = −2.5 g + (n × gSTEP)

where n = 0, 1, …, 50.

For testing across a range of ±500°/sec (gyroscope) or ±14 g

(accelerometer), apply the following input stimulus profile:

ΩSTEP = 10°/sec

gSTEP = 250 mg

Ωn = −500°/sec + (n × ΩSTEP)

where n = 0, 1, …, 99.

gn = −14 g + (n × gSTEP)

where n = 0, 1, …, 95.

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