I have tried clocking the ICM-42688-P at 19.2 kHz through the CLKIN input.
This appears to work fine, however, the datasheet specifies the allowed range
for CLKIN as (31, 32, 50)kHz.
My question is, what limits the low frequency performance of the CLKIN pin?
Will the PLL loose lock? Is accuracy degraded?
Just looking at the traces at 19.2 kHz vs 32 kHz, the lower clock rate appears
to work just as well, just at a lower ODR.