Independent Analog Peripherals Supply; Figure 7. Power Supply Overview - ST STM32L4x6 Reference Manual

Power control (PWR)
When the VREF+ is double-bonded with VDDA in a package, the internal voltage
reference buffer is not available and must be kept disable (refer to datasheet for
packages pinout description).
V
REF-
An embedded linear voltage regulator is used to supply the internal digital power V
V is the power supply for digital peripherals, SRAM1 and SRAM2. The Flash is
CORE
supplied by V
5.1.1

Independent analog peripherals supply

To improve ADC and DAC conversion accuracy and to extend the supply flexibility, the
analog peripherals have an independent power supply which can be separately filtered and
shielded from noise on the PCB.
•
The analog peripherals voltage supply input is available on a separate V
•
An isolated supply ground connection is provided on V
The V
DDA
before enabling any of the analog peripherals supplied by V
converter, comparators, operational amplifiers, voltage reference buffer).
134/1693
must always be equal to V
and V .
CORE DD

Figure 7. Power supply overview

supply voltage can be different from V
DocID024597 Rev 3
.
SSA
. The presence of V
DD
DDA
pin.
SSA
must be checked
DDA
(A/D converter, D/C
DDA
RM0351
.
CORE
pin.