On the data sheet for i.MX RT1060 family https://www.nxp.com/docs/en/nxp/data-sheets/IMXRT1060CEC.pdf, table 55 (page 64) includes a line that says the Effective Number of Bits in 12 bit mode is typically 10.7, and a minimum of 10.1.
Also, the Integral Nonlinearity is given as 2.78 bits typical, with no maximum.
This NXP appnote defines the terms:https://www.nxp.com/docs/en/application-note/AN2438.pdf
I believe that an integral nonlinearity > 1 means there will be missing codes, and the ENOB < 12 makes this interpretation likely to be correct.
Also, the Integral Nonlinearity is given as 2.78 bits typical, with no maximum.
This NXP appnote defines the terms:https://www.nxp.com/docs/en/application-note/AN2438.pdf
I believe that an integral nonlinearity > 1 means there will be missing codes, and the ENOB < 12 makes this interpretation likely to be correct.