The spec sheet for the ADXL356 says the internal filter has a 50% response at 1.5k Hz, but the plot shows a gain of .7 at 1.5k Hz. The structure should have a gain of about 1.1 at 1.5k Hz so the total gain should be about .55 at 1.5k Hz. What am I missing or is there an error? Also the internal filter is said to be a sinc3. I assume this means it of the form ((sin(const*freq))/(const*freq))^3. What is the value of the "const"?