Kindly provide the thermal (JA, JB, JC) data for the part ADL5903SCPZN-R7. If you have PDML files also, you can share them.
ADL5903
Recommended for New Designs
The ADL5903 is a true rms responding power detector that has a 35 dB measurement range. It features low power consumption and an intrinsically ripple-free...
Datasheet
ADL5903 on Analog.com