STM32F100R4 datasheet(67/84 Pages) STMICROELECTRONICS

67 / 84 page

STM32F100x4, STM32F100x6, STM32F100x8, STM32F100xB

Electrical characteristics

Doc ID 16455 Rev 2

67/84

The above formula (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).

Note:

ADC accuracy vs. negative injection current: Injecting a 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

Table 42.

RAIN max for fADC = 12 MHz

(1)

Guaranteed by design, not tested in production.

Ts (cycles)

tS (µs)

RAIN max (k)

1.5

0.125

0.4

7.5

0.625

5.9

13.5

1.125

11.4

28.5

2.375

25.2

41.5

3.45

37.2

55.5

4.625

71.5

5.96

239.5

Table 43.

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

ADC DC accuracy values are measured after internal calibration.

Based on characterization, not tested in production.

Symbol

Parameter

Test conditions

Typ

Max

Unit

Total unadjusted error

fPCLK2 = 24 MHz,

fADC = 12 MHz, RAIN < 10 k,

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

Table 44.

ADC accuracy(1) (2)

ADC DC accuracy values are measured after internal calibration.

Better performance could be achieved in restricted VDD, frequency, VREF and temperature ranges.

Symbol

Parameter

Test conditions

Typ

Max(3)

Based on characterization, not tested in production.

Unit

Total unadjusted error

fPCLK2 = 24 MHz,

fADC = 12 MHz, RAIN < 10 k,

VDDA = 2.4 V to 3.6 V

Measurements made after

ADC calibration

±2

±5

LSB

Offset error

±1.5

±2.5

Gain error

±1.5

±3

Differential linearity error

±1

±2

Integral linearity error

±1.5

±3

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