How can I set up the parameters to optimize the EMC behavior (e.g. 96MHz) (IMO , Prescaler , Ref , IDAC trends => greater or lower...)?

Please see TL cases 29ZI7VX and 3DGU6D that includes a lot of good information on various EMC issues: Lower IMO = better RE. Lower Prescaler frequency = better RE. Lower Ref voltage = better RE Lower IDAC values = better RE.

Note that the most important EMC aspect is the layout design, however, sometimes the pre-charge source selection can have an impact on RE too. The pick of timer can cause RE at known frequencies with higher peaks and the choice of pre-charge source can also cause RE at all frequencies, but lower. Generally, improving RE will cause your EMI immunity to get worse.

For example, lowering the reference voltage will get you lower RE, but is will also reduces the level of your CS signals, which will in turn make the design more susceptible to EM noise.

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