Analog Supply - ST STM32F4 Series Application Note

Power supplies
2.3

Analog Supply

To improve conversion accuracy, the ADC has an independent power supply that can be
filtered separately, and shielded from noise on the PCB.
•
The ADC voltage supply input is available on V
•
An isolated supply ground connection is provided on the V
In all cases, the VSSA pin should be externally connected to same supply ground than VSS.
To ensure a better accuracy on low-voltage inputs, the user can connect a separate external
reference voltage ADC input on VREF+. The voltage on VREF+ may range from (V
V) to V
DDA
When available (depending on package), V
12/50
with a minimum of 1.7 V.
AN4488 Rev 7
pin.
DDA
SSA
must be externally tied to V
REF–
AN4488
pin.
- 1.2
DDA
.
SSA