With the help of StephanB, we have identified two typos in this datasheet, which both relate to the 16-bit command codes that trigger the GLOB_CMD (clear DIAG_STAT flags) and GLOB_CMD (self-test) routines. Please see the following graphics, which highlight the area of error and offer the correct information, in red.
Page 14 (click on image for higher-resolution view):
Page 15 (click on image for higher-resolution view):
Revision A of the ADIS16223 is now released and available for viewing at the site listed in this post. Thanks again for helping us identify these typos!