STM32F103RG datasheet(102/120 Pages) STMICROELECTRONICS

102 / 120 page

Electrical characteristics

STM32F103xF, STM32F103xG

102/120

Doc ID 16554 Rev 3

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 63.

RAIN max for fADC = 14 MHz

(1)

Guaranteed by design, not tested in production.

Ts (cycles)

tS (µs)

RAIN max (kΩ)

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 64.

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 ΣIINJ(PIN) in Section 5.3.14 does not

affect the ADC accuracy.

Symbol

Parameter

Test conditions

Typ

Max(3)

Based on characterisation, not tested in production.

Unit

Total unadjusted error

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

±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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