STM32F217VG datasheet(116/173 Pages) STMICROELECTRONICS

116 / 173 page

Electrical characteristics

STM32F21xxx

116/173

Doc ID 17050 Rev 8

Note:

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 IINJ(PIN) and ΣIINJ(PIN) in

Section 5.3.16 does not affect the ADC accuracy.

Figure 48.

ADC accuracy characteristics

Example of an actual transfer curve.

Ideal transfer curve.

End point correlation line.

ET = 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.

Better performance could be achieved in restricted VDD, frequency and temperature ranges.

Based on characterization, not tested in production.

1L SBIDEAL

4095

4094

4093

456

4093 4094 4095 4096

(1)

(2)

(3)

VDDA

VSSA

ai14395c

VREF+

4096

(or

depending on package)]

VDDA

4096

[1LSBIDEAL =

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