Datasheet

STM32F101x4, STM32F101x6 Electrical characteristics
Doc ID 15058 Rev 5 67/79
Figure 33. Typical connection diagram using the ADC
1. Refer to Table 42 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 34. The 10 nF capacitors
should be ceramic (good quality). They should be placed them as close as possible to the
chip.
Figure 34. Power supply and reference decoupling
ai14139d
STM32F10xxx
V
DD
AINx
I
L
±1 µA
0.6 V
V
T
R
AIN
(1)
C
parasitic
V
AIN
0.6 V
V
T
R
ADC
(1)
C
ADC
(1)
12-bit
converter
Sample and hold ADC
converter
V
DDA
STM32F10xx4/6
1 µF // 10 nF
V
SSA
ai15498