I am not able to find Thermal resistance of ADG508 (Junction to Ambient). Can you share the same (all packages)?
The theta J-A (Junction to Ambient) for the ADG508A packages are as follows:
16 lead SOIC = 124.9 degC/W
16 lead PDIP = 103.3 degC/W
20 lead PLCC = 89.4 degC/W