STM32F103CBT6 datasheet(76/102 Pages) STMICROELECTRONICS

76 / 102 page

Electrical characteristics

STM32F103x8, STM32F103xB

76/102

Doc ID 13587 Rev 14

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 47.

RAIN max for fADC = 14 MHz

(1)

Based on characterization, 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 48.

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 5.3.12 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 kΩ,

VDDA = 3 V to 3.6 V

TA = 25 °C

Measurements made after

ADC calibration

±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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