STM32F101R4U6ATR datasheet(67/87 Pages) STMICROELECTRONICS

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RAIN

fADC CADC

()

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

RADC

–

DocID15058 Rev 6

67/87

STM32F101x4, STM32F101x6

Electrical characteristics

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

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 43. 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 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 5.3.12 does not

affect the ADC accuracy.

Symbol

Parameter

Test conditions

Typ

Max(3)

3. Based on characterization, not tested in production.

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

±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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