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ADC power up sequence & ext. reference

In my project utilizing F28335 there's an external voltage reference (2.048V). When the ADC module is initialized according to specs i.e. first select reference source then power up bandgap circuitry the conversion results are bad - it looks like gain is lower than expected by 8%!However, if I select external source after having powered bandgap circuitry the conversion results are correct.