Unfortunately we have not characterized any data on how this part behaves outside of the specified frequency range, whether that be below or above the frequency limits. It is likely that the required external caps may limit the frequency beyond the part itself. The part can likely function outside of the frequency range but specifications in the Electrical Characteristics table may go outside their min and max limits with the Frequency Response Flatness being the most likely specification to significantly change.
We suspect that the gain will likely become non-linear outside of specified operating frequency.