ADIS16227: spectral resolution possible with the FFT

Q

Which spectral resolution you can reach with the
ADIS15227: can you perform the FFT on the 300Hz - 3300Hz frequency band with
arbitrary resolution or you have a limit on that?

A

On this part, they are only able to use the SRx settings in the REC_CTRL
register to configure the bin width. Table 10 and 14 of the datasheet offer
and describe the SR1 setting, which covered 6.2kHZ of bandwidth and offer a bin
width of 25Hz. If they use enough FFT averages, they will able to achieve a
resolution of ~16.5mg per bin with this setting.

(3.3mg/sqrt(Hz) x sqrt(5Hz)).

http://www.analog.com/static/imported-files/data_sheets/ADIS16227.pdf#Page=10