ADIS16501SLASHPCBZ datasheet(17/45 Pages) AD

17 / 45 page

Data Sheet

ADIS16501

TERMINOLOGY

analog.com

Rev. B | 17 of 45

Figure 28. Microlinearity Characteristic

Cutoff (−3 dB) Frequency

For applied AC acceleration and angular rates, cutoff (−3 dB)

frequency is the frequency at which the input stimulus is attenuated

in amplitude by 29.3% (1 − √2 ÷ 2) at the output of the signal chain.

The −3 dB corner is set according to the electrical signal chain

filter selected by the user. All other signal chain elements have an

appreciably high bandwidth and are not significant contributors to

the cutoff frequency.

Cutoff (−3 dB) Frequency Tolerance

Cutoff (−3 dB) frequency tolerance is the allowable variation to the

frequency at which a −3 dB (29.3%) signal attenuation is achieved.

The device clock directly correlates to the cutoff frequency achieved

by the ADIS16501. For each percent that the device clock frequen-

cy varies from its nominal value, so too does the cutoff frequency.

Low-Pass Filter Group Delay

The low-pass filter group delay is the time required for the signal

chain output to transition from 10% to 90% of its final value.

Low-pass filter group delay is measured in response to an applied

step change in acceleration or angular rate. The low-pass filter

group delay tolerance is equivalent to the cutoff (−3 dB) frequency

tolerance.

RMS Noise

RMS noise is the standard deviation of the acceleration or angular

rate output without an applied inertial stimulus. RMS noise can

be specified at either room temperature (25°C ± 5°C), or over

the entire operating temperature range (−40°C to +105°C). The

calculation method to assess the RMS noise is the same, regard-

less of the temperature range. Make this measurement with a

sufficiently high sample rate and sufficiently long duration to ensure

that adequate accuracy and repeatability are achieved according to

the requirements of the measurement system.

RMS noise= 1n−1∑i=1nxi−x2

where:

n is the number of sample values.

xi is the individual sample value.

x is the mean value of the population.

Resonant Frequency

Resonant frequency is also known as natural frequency (f0). Input

acceleration at the resonant frequency of a MEMS element causes

the sensor to displace by an amount equivalent to the applied

acceleration multiplied by the quality factor. For either underdamp-

ed or overdamped systems, acceleration applied at the resonant

frequency is not inherently destructive to the MEMS element.

Quality Factor

The quality factor is a scalar factor that governs the increase or

decrease in amplitude of an acceleration signal applied at the

resonant frequency of a MEMS element.

Sensitivity to Linear Acceleration (Limited

Condition, Gyroscope Only)

Sensitivity to linear acceleration is the change in the angular rate

output of the ADIS16501 in response to an applied linear accel-

eration. It is measured in °/sec/g. Reduced sensitivity to linear

acceleration improves the angular rate signal accuracy in harsh

environments where shock and vibration are present. Analog Devi-

ces, Inc., validates the gyroscope sensitivity to linear acceleration

through the application of both DC acceleration and Haversine

shock testing (<90 g peak and ≤10 ms duration).

Power-On Reset (POR)

After either a hardware or software reset, the ADIS16501 performs

a series of internal diagnostic routines to ensure the integrity of its

various signal chains. Although the inertial channels are not fully

settled until tSETTLE elapses, SPI communications can be conducted

after a minimum holdoff time of tPOR. This allows the system to

request noninertial data, apply desired configurations, or run the

available diagnostic routines.

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