Datasheet

DocID15081 Rev 8 85/105
STM32F100xC, STM32F100xD, STM32F100xE Electrical characteristics
104
Note: Any positive injection current within the limits specified for I
INJ(PIN)
and Σ I
INJ(PIN)
in
Section 5.3.13 does not affect the ADC accuracy.
Figure 33. ADC accuracy characteristics
Figure 34. Typical connection diagram using the ADC
1. Refer to Table 51 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 35 or Figure 36,
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 them as close as possible to the chip.
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