kriswiner / ilps22qs Goto Github PK

I'm curious how this (and the LPS22DF which seems to have similar performance but lacks the 4 bar mode) performs relative to the LPS22HH. They certainly quote much better performance than the LPS22HH, but there's one thing I noted that seems odd...

The quoted accuracy for the LPS22HH is .65 Pa at ODR/20. Which is a lot of filtering...
By contrast, the quoted accuracy for the LPS22DF/ILPS22QS is 0.34 Pa at ODR/9 BUT they specify an AVG=512, and max ODR is 200Hz.

The way I see it, a noise spec is only meaningful as a function of bandwidth. ODR/9 sounds like its more than 2x the bandwidth and almost half the noise, which is awesome... But what does AVG=512 mean? Assuming true gaussian noise, averaging 512 elements would be expected to reduce noise by a factor of 512^,5. It's hard to understand how you could average the last 512 samples and still have a bandwidth of 11% of the output data rate.