What is the reason to define the "light condition"(<= 600lux) on Typical Performance Characteristics as reported at page 8 of datasheet?
ADL5502 is wafer-level chip scale package. Mounted on the board, the top side will be coated and block light, but stray ambient light can get in from the sides and create free carriers in silicon. This causes higher leakage currents in some places of the design, which causes excess log conformance error. The light sensitivity phenomenon is non-destructive, and errors due to ambient light will disappear when light is removed.
See also datasheet page 22, under the heading "DEVICE HANDLING". -Bruce H.