STM32F070CB datasheet(63/83 Pages) STMICROELECTRONICS

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DocID027114 Rev 3

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STM32F070CB/RB/C6/F6

Electrical characteristics

Table 50. RAIN max for fADC = 14 MHz

Ts (cycles)

tS (µs)

RAIN max (kΩ)(1)

1.5

0.11

0.4

7.5

0.54

5.9

13.5

0.96

11.4

28.52.0425.2

41.52.9637.2

55.5

3.96

71.5

5.11

239.5

17.1

1. Guaranteed by design, not tested in production.

Table 51. ADC accuracy(1)(2)(3)

Symbol

Parameter

Test conditions

Typ

Max(4)

Unit

Total unadjusted error

fPCLK = 48 MHz,

fADC = 14 MHz, RAIN < 10 kΩ

VDDA = 2.7 V to 3.6 V

TA =

−40 to 85 °C

±3.3

±4

LSB

Offset error

±1.9

±2.8

Gain error

±2.8

±3

Differential linearity error

±0.7

±1.3

Integral linearity error

±1.2

±1.7

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 (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

negative current.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.14 does not affect the ADC

accuracy.

3. Better performance may be achieved in restricted VDDA, frequency and temperature ranges.

4. Data based on characterization results, not tested in production.

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