STM32F103XC datasheet(100/118 Pages) STMICROELECTRONICS

100 / 118 page

Electrical characteristics

STM32F103xC, STM32F103xD, STM32F103xE

100/118

Equation 1: RAIN max formula:

The formula above (Equation 1) is used to determine the maximum external impedance allowed for an

error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).

Table 58.

RAIN max for fADC = 14 MHz

(1)

Data guaranteed by design, not tested in production.

Ts (cycles)

tS (µs)

RAIN max (kΩ)

1.5

0.11

1.2

7.5

0.54

13.5

0.96

28.5

2.04

41.5

2.96

55.5

3.96

71.5

5.11

104

239.5

17.1

350

Table 59.

ADC accuracy - limited test conditions(1)

ADC DC accuracy values are measured after internal calibration.

Symbol

Parameter

Test conditions

Typ

Max(2)

Data based on characterization, not tested in production.

Unit

Total unadjusted error(3)

ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-

robust) 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

standard analog pins which may potentially inject negative current.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 5.3.13 does not

affect the ADC accuracy.

fPCLK2 = 56 MHz,

fADC = 14 MHz, RAIN < 10 kΩ,

VDDA = 3 V to 3.6 V

TA = 25 °C

Measurements made after

ADC calibration

VREF+ = VDDA

±1.3

±2

LSB

Offset error(3)

±1

±1.5

Gain error(3)

±0.5

±1.5

Differential linearity error(3)

±0.7

±1

Integral linearity error(3)

±0.8

±1.5

AIN

ADC

()

----------------------------------------------------------------

ADC

–

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