Datasheet

DocID022265 Rev 6 79/121
STM32F051x4 STM32F051x6 STM32F051x8 Electrical characteristics
90
Figure 25. ADC accuracy characteristics
Figure 26. Typical connection diagram using the ADC
1. Refer to Table 52: 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 13: Power supply
scheme. The 10 nF capacitor should be ceramic (good quality) and it should be placed as
close as possible to the chip.
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