Datasheet

Electrical characteristics STM32L071xx
100/144 DS10690 Rev 6
Figure 30. Typical connection diagram using the ADC
1. Refer to Table 62: ADC characteristics for the values of R
AIN
, R
ADC
and C
ADC
.
2. C
parasitic
represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the
pad capacitance (roughly 7 pF). A high C
parasitic
value will downgrade conversion accuracy. To remedy
this, f
ADC
should be reduced.
General PCB design guidelines
Power supply decoupling should be performed as shown in Figure 31 or Figure 32,
depending on whether V
REF+
is connected to V
DDA
or not. The 10 nF capacitors should be
ceramic (good quality). They should be placed as close as possible to the chip.
Figure 31. Power supply and reference decoupling (V
REF+
not connected to V
DDA
)
MSv34712V1
V
DDA
AINx
IL±50nA
V
T
R
AIN
(1)
C
parasitic
V
AIN
V
T
R
ADC
12-bit
converter
C
ADC
Sample and hold ADC
converter
MS39601V1
V
REF+
STM32Lxx
V
DDA
V
SSA
/ V
REF–
1 μF // 100 nF
1 μF // 100 nF
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