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External Voltage Reference? To get a most accurate ADC result

Question asked by chen.richie on Oct 6, 2014
Latest reply on Oct 6, 2014 by sung.chen_chung
Dear all,

We are trying to use the on-chip ADC of STM32F407. We have read two appnotes, which are AN4073 How to improve ADC accuracy when using STM32F2xx and
STM32F4xx microcontrollers and AN2834 How to get the best ADC accuracy in STM32F10XXX devices.

It is mentioned that using external voltage references may help improve the performance. My question is that is it really necessary to use voltage references? Comparing with filtered LDO outputs, how the performance could be improved? 

Thanks a lot.