STM32F101XF datasheet(94/117 Pages) STMICROELECTRONICS

94 / 117 page

Electrical characteristics

STM32F101xF, STM32F101xG

94/117

DocID16553 Rev 5

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 57. RAIN max for fADC = 14 MHz(1)

1. Guaranteed by design.

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

1. ADC DC accuracy values are measured after internal calibration.

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

Symbol

Parameter

Test conditions

Typ

Max(3)

3. Guaranteed by characterization results.

Unit

Total unadjusted error

fPCLK2 = 28 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

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