STM32F103CB datasheet(77/105 Pages) STMICROELECTRONICS

77 / 105 page

STM32F103x8, STM32F103xB

Electrical characteristics

Doc ID 13587 Rev 15

77/105

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 a 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 currents.

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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