In principle the datasheet says that the minimum frequency is 10MSPS.
Can it work with a sampling frequency of 1MSPS?
The minimum characterized sample rate of this ADC is 10MHz. By flipping a spi
bit you can adjust the PLL loop bandwidth and allow for sample rates down to
5MHz but with some variance in the performance. Down to 1MSPS is not tested or
characterized. I was wondering if you have consider in using the 5MSPS and only
use one of every 5th sample. In this effect it realistically is 1MSPS.