I have a setup of 18 ADXL355 separated by 10 cm each that i want to be able to sample synchronous at 1 kHz.
I was originally hoping to use the synchronization option "External Sync and External Clock", but when i have the EXT_CLK at 256 kHz and a SYNC pulse at 1 kHz that originates from the same clock source i don't get correct measurements. I suspect this is due to the "The phase of sync must meet an approximate 25 ns setup time to the EXT_CLK rising edge".
My questions are:
- Have i miss understood the "External Sync and External Clock" by not thinking the the EXT_CLK and SYNC had to be aligned by their rising edges?
- What would then be the best option for synchronizing multiple ADXL355?
- If I use the option "External Sync with Interpolation", what would be the purpose of using an external clock? Is it related to when the interpolations are sampled?
- Those the interpolation filter estimate value of samples between each sample or is the signal actually sampled at 64 times the sampling frequency?
Thanks in advance for your reply.