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ADXL193 Bessel filter

Can someone please confirm this?  The 400 Hz Bessel filter built into the ADXL193 - any vibrations with greater than 400 Hz freqency are attentuated (ideally to zero, but I know filters don't roll off that fast).  How much delay does the signal experience when going through this filter?  Is the group delay in the passband nearly constant?  Thanks.