Datasheet

DS6329 Rev 16 127/184
STM32F20xxx Electrical characteristics
183
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 6.3.16 does not affect the ADC accuracy.
Figure 52. ADC accuracy characteristics
1. Example of an actual transfer curve.
2. Ideal transfer curve.
3. End point correlation line.
4. E
T
= Total Unadjusted Error: maximum deviation between the actual and the ideal transfer curves.
EO = Offset Error: deviation between the first actual transition and the first ideal one.
EG = Gain Error: deviation between the last ideal transition and the last actual one.
ED = Differential Linearity Error: maximum deviation between actual steps and the ideal one.
EL = Integral Linearity Error: maximum deviation between any actual transition and the end point
correlation line.
Figure 53. Typical connection diagram using the ADC
1. Refer to Table 66 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 downgrades conversion accuracy. To remedy this,
f
ADC
must be reduced.
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