STM32F102X4 datasheet(59/69 Pages) STMICROELECTRONICS

59 / 69 page

STM32F102x4, STM32F102x6

Electrical characteristics

Doc ID 15057 Rev 3

59/69

Note:

ADC accuracy vs. negative injection current: Injecting a negative current on any of the

standard (non-robust) analog pins should be avoided as this significantly reduces the

accuracy of the conversion being performed on another analog pin. It is recommended to

add a Schottky diode (pin to ground) to standard analog pins that may potentially inject

negative current.

Any positive injection current within the limits specified for IINJ(PIN) and IINJ(PIN) in

Section 5.3.12 does not affect the ADC accuracy.

Table 45.

RAIN max for fADC = 12 MHz

(1)

Data guaranteed by design, not tested in production.

Ts (cycles)

tS (µs)

RAIN max (k)

1.5

0.13

0.4

7.5

0.63

5.9

13.5

1.13

11.4

28.5

2.38

25.2

41.5

3.46

37.2

55.5

4.63

71.5

5.96

239.5

19.96

Table 46.

ADC accuracy - limited test conditions(1)

ADC DC accuracy values are measured after internal calibration.

Symbol

Parameter

Test conditions

Typ

Max(2)

Based on characterization, not tested in production.

Unit

Total unadjusted error

fPCLK2 = 48 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 47.

ADC accuracy(1) (2)

ADC DC accuracy values are measured after internal calibration.

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

Symbol

Parameter

Test conditions

Typ

Max(3)

Based on characterization, not tested in production.

Unit

Total unadjusted error

fPCLK2 = 48 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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