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TMS320F28335: Isolation of Analog and Digital ground and ADC reference voltage selection

Part Number: TMS320F28335

Dear Experts,

I am working on the design of a custom  F28335 board. There are two issues that are bothering me at this point of time. Firstly, it's about about, whether Analog and Digital grounds can be isolated. Secondly, I want to know why there are 3 ADC REF VOLTAGES(1.5V, 1..024V, 2.048V), that are given as a choice to the user? Is there any advantage for a particular voltage level over another? Which voltage would you recommend?

Regards,

Rajesh BN.

Regards,
Rajesh BN.