LSM6DSO analog anti aliasing

[adrianT]

Hi,

I would like to confirm if setting LSM6DSO ODR to 6.66KHz and LPF2 to ODR/10 (resulting to 666Hz bandwidth), then setting a FIFO decimation factor of 8 (resulting to 833hz FIFO ODR) will work in preventing aliasing for signals above 417Hz?

We have discovered with LSM6DSL that it doesn't work that well, but looking at a previous post where the LSM6DSO is recommended (Solved: LSM6DSL anti-aliasing filters do not appear to be ... - STMicroelectronics Community). So I would like to confirm it before we do a hardware change in production.

Thank you. 

[Federica Bossi]

Ciao @adrianT ,

LSM6DSO has effectively more performing filter like descripted in the other post.

Regarding your case using FIFO decimation of 8 result to a sampling frequency of 833 Hz while should be double respect signal bandwidth 2*ODR/10 = 1333 Hz. So I would suggest to use FIFO BatchDataRate of 4 to avoid aliasing.

Otherwise you can set LPF2 to have ODR/20 and leave sampling frequency with FIFO decimation of 8.