Is it possible to get the ADC type AD9254S space grade as an engineering sample. Which part number has the AD9254S engineering sample. If there is no AD9254S engineering sample to get, has the commercial product type AD9254 the exact same behavior as the space grade type except radiation hardness?
If referring to the AD9246/AD9246S then the same answer would apply as above for the AD9254/AD9254S for the models.
The goal with the space version of the product is to maintain as much as possible the same or similar performance as the commercial product. The available commercial models should be a good approximation of performance for the space models. There are minor differences so I would encourage you to do at least a quick comparison between the data sheets for the two versions of the parts to understand the minor differences and evaluate how they may affect your application in particular.