Hi,
The correct voltage levels are VDD, 5/6VDD, 3/6VDD, GND. The ADS6445 datasheet has this correct and some of the other datsheets in this family of devices still need to be updated. I will ask this week about getting this started.
The EVMs have the configuration resistors in the bill of materials as 1K over 2K over 3K but the User Guide was created before these values were settled on.
The SEN pin does not have the same voltage settings as the four CFG pins - the SEN pin is still VDD, 5/8VDD, 3/8VDD and GND. The CFG pins had some circuitry related to ESD protection that threw off the trip voltages from what was originally desired, but the SEN pin did not suffer that same effect and so the SEN pin did not need to have any datasheet edits to its voltage levels.
Regards,
Richard P.