Hi Daaf,
I do want to clarify, the ADS4249 can sample DC signals. There is no internal AC coupling inside the part. However, the part will not perform well with a single-ended input, so it would need to be converted to a differential signal first using a high-speed fully differential amplifier. The EVM however will not work directly with DC coupled signals due to the onboard transformers.
Regards,
Matt Guibord