I kundly ask about the effective resolution for this accelerometer model.
Suppose to work ad ODR=400 Hz hence BW=200 Hz.
From the device datasheet we have a PSD=99 ug/sqrt(Hz) @ 4g scale ODR=400 Hz
From the AN4075 the SNR(db) will be equal to:
SNR(db)=20*log*(4g/(2sqrt(2)) / NRMS)
NRMS = PSD*SQRT(BW)=99u*SQRT(200)=1.4 mg
and finally we have for the bits number:
This means that instead of the theoretical 14 bit we have really usable 9 bit of resolution then 4g/2^9.68=4.87 mg of resolution.
Someone have carried out similar calculation?
Thanks in advance!