Hello Cedric,
We have got an answer from TI and they say the datasheet is confusing but actually there are two groups:
- 00, 01, and 10 for internal reference
- 11 for external reference
In other words, '00', '01' and '10' are valid for internal reference.
I guess the problem is more about automatic offset compensation then.
I hope that helps.
Best Regards,
Arnaud