I am working on a design on stm32f407vgt6 which I don't want to use the ADC & DAC so I don't have to connect the circuit of ADC and leave VDDA&VSSA&VREF floating?
In the datasheet of the stm32f407xx device, section "Power supply scheme", it's indicated that VSSA and VDDA pins MUST be respectively connected to VSS and VDD in order to correctly power on the device; Otherwise, you will be out of specification.
For the VREF pin, it SHOULD be connected.
-> So, whether you will be using DAC/ADC peripherals or not, I advice you to correctly connect those pins as indicated on the datasheet.
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