STM32F103XC datasheet(99/123 Pages) STMICROELECTRONICS

99 / 123 page

STM32F103xC, STM32F103xD, STM32F103xE

Electrical characteristics

Doc ID 14611 Rev 7

99/123

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 59.

RAIN max for fADC = 14 MHz

(1)

Guaranteed by design, not tested in production.

Ts (cycles)

tS (µs)

RAIN max (k)

1.5

0.11

0.4

7.5

0.54

5.9

13.5

0.96

11.4

28.5

2.04

25.2

41.5

2.96

37.2

55.5

3.96

71.5

5.11

239.5

17.1

Table 60.

ADC accuracy - limited test conditions(1)(2)

ADC DC accuracy values are measured after internal calibration.

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 IINJ(PIN) in Section 5.3.13 does not

affect the ADC accuracy.

Symbol

Parameter

Test conditions

Typ

Max(3)

Based on characterization, not tested in production.

Unit

Total unadjusted error

fPCLK2 = 56 MHz,

fADC = 14 MHz, RAIN < 10 k,

VDDA = 3 V to 3.6 V

TA = 25 °C

Measurements made after

ADC calibration

VREF+ = VDDA

±1.3

±2

LSB

Offset error

±1

±1.5

Gain error

±0.5

±1.5

Differential linearity error

±0.7

±1

Integral linearity error

±0.8

±1.5

AIN

ADC





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

ADC

–



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