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TMS320F28069M: Internal ADC reference

Part Number: TMS320F28069M
Other Parts Discussed in Thread: TMS320F28069

Hello!

I have a question regarding internal voltage reference for ADC in TMS320F28069 Microcontroller. In Technical Reference Manual I have found that the only internal reference manual is 3.3V. Is it connected to VDD, or is it a separate reference? And what happens if VDD voltage drops belov 3.3V? Does the internal reference still stays 3.3V? If it is so, how does it works?

Thanks!

Vladislav