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| AN1636 Datasheet, PDF (36/42 Pages) STMicroelectronics – UNDERSTANDING AND MINIMISING ADC CONVERSION ERRORS | |||
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UNDERSTANDING AND MINIMISING ADC CONVERSION ERRORS
Important: Separate Analog and Digital supplies are recommended only if the microcontroller
has VAREF pins for the ADC reference voltage (instead of VDDA). If the microcontroller does
not have VAREF pins, then the difference between VDDA and VDD should not be more than the
difference specified in the datasheet (check the Absolute maximum ratings). Generally the dif-
ference between VDDA and VDD is specified as 50mV, hence separate supplies are not recom-
mended.
Figure 33. Separating the analog and digital supplies
Linear
Regulator
Analog
Circuit
SMPS
VAREF
VSSA
VDD
VSS
Microcontroller
AC
mains
36/42
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