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ADAU1452 Digital Microphone decimation filter


I m considering using the Digital microphone input, there is unfortunately no information in the datasheet about the Decimation filter involved and its characteristiques (frequency respone, group delay, ENOB ...) . Is it possible to have more details on this ?

I ve been reading the following application note :

does the adau1452 process the signal in a same way ?

After a "link connect" it seems the program size is only impacted by 2 steps , so the algorithme is done in paralell in the silicium without possibility to modify it ?

The datasheet mention the possibility to use a microphone lile ADMP522 which has a 4th order modulator. Is it mandatory to use such a modulator or is it possible to use a second order modulator like with the AD7401A ?

Thank you