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Practical use of ADC in small pin count package, with no Vref pins

Question asked by Petersen.Geert on Oct 9, 2011
Latest reply on Oct 12, 2011 by Donald Becker
We are currently evaluating STM32F103 series as replacement in a current product, and it was quite a surprise to discover no ADC Vref pin is present in the smaller packages. It is internally connected to Vdda ( supply ), which in our case is not very accurate ( 3.0..3.6 V ).
Is there a clever way to overcome this without using a larger package ?