Hi,
The device would probably be functional at 213M, but with no guarantees. When a device is released for manufacture it has a production test program that tests for datasheet parameters and particularly for datasheet parameters that have a guaranteed minimum or maximum value. The device is not production tested for use outside of datasheet limits and so even if one device you get works there we cannot guarantee the next device you pick up would also work there. It wouldn't have been tested for it.
Notice, however, that the contour plots of figures 28 and 29 show SFDR and SNR over input frequency and with sampling rate up to 210Msps - past the 200Msps datasheet spec and almost to your requested 213M. This should give you some idea as to whether the device can operate at 213M and what would happen to SNR and SFDR. The performance starts to tail off rapidly after 200Msps. In fact, 200Msps was pushing it a bit in the first place for good SNR and SFDR. This might be one of the reasons that the data sheet on the TI web says across the top "ADS5485 is not recommended for new designs".
Regards,
Richard P.