CD00237391 datasheet(117/177 Pages) STMICROELECTRONICS

117 / 177 page

STM32F20xxx

Electrical characteristics

Doc ID 15818 Rev 9

117/177

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 49.

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.

Table 65.

ADC accuracy (1)

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

Symbol

Parameter

Test conditions

Typ

Max(2)

Based on characterization, not tested in production.

Unit

Total unadjusted error

fPCLK2 = 60 MHz,

fADC = 30 MHz, RAIN < 10 kΩ,

VDDA = 1.8

(3) to 3.6 V

If IRROFF is set to VDD, this value can be lowered to 1.7 V when the device operates in the 0 to 70 °C

temperature range.

±2

±5

LSB

Offset error

±1.5

±2.5

Gain error

±1.5

±3

Differential linearity error

±1

±2

Integral linearity error

±1.5

±3

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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