Datasheet

Electrical characteristics STM32F373xx
100/137 DocID022691 Rev 7
Figure 27. ADC accuracy characteristics
Figure 28. Typical connection diagram using the ADC
1. Refer to Table 60 for the values of R
SRC
, 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 9. The 10 nF capacitor
should be ceramic (good quality) and it should be placed as close as possible to the chip.
2. ADC accuracy vs. negative injection current: Injecting a negative current on any analog input pins should
be avoided as this significantly reduces the accuracy of the conversion being performed on another analog
input. It is recommended to add a Schottky diode (pin to ground) to analog pins which may potentially inject
negative currents.
Any positive injection current within the limits specified for I
INJ(PIN)
and ΣI
INJ(PIN)
in Section 6.3.14 does not
affect the ADC accuracy.
3. Better performance may be achieved in restricted V
DDA
, frequency and temperature ranges.
4. Guaranteed by characterization results.
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