STM32F103XC datasheet(108/143 Pages) STMICROELECTRONICS

108 / 143 page

Electrical characteristics

STM32F103xC, STM32F103xD, STM32F103xE

108/143

DS5792 Rev 13

Figure 57. ADC accuracy characteristics

1. Example of an actual transfer curve.

2. Ideal transfer curve.

3. End point correlation line.

4. 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 62. ADC accuracy(1) (2)(3)

1. ADC DC accuracy values are measured after internal calibration.

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

3. ADC Accuracy vs. Negative Injection Current: Injecting 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 current.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 5.3.14 does not

affect the ADC accuracy.

Symbol

Parameter

Test conditions

Typ

Max(4)

4. Guaranteed by characterization results.

Unit

Total unadjusted error

fPCLK2 = 56 MHz,

fADC = 14 MHz, RAIN < 10 kΩ,

VDDA = 2.4 V to 3.6 V

Measurements made after

ADC calibration

±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

STM32F103XC Datasheet(PDF) 108 Page - STMicroelectronics

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