STM32F042F4 datasheet(80/117 Pages) STMICROELECTRONICS

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Electrical characteristics

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DocID025832 Rev 5

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).

RAIN

fADC CADC

()

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

RADC

–

Table 55. 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 56. 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 = 3 V to 3.6 V

TA = 25 °C

±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

Total unadjusted error

fPCLK = 48 MHz,

fADC = 14 MHz, RAIN < 10 kΩ

VDDA = 2.7 V to 3.6 V

TA = - 40 to 105 °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

Total unadjusted error

fPCLK = 48 MHz,

fADC = 14 MHz, RAIN < 10 kΩ

VDDA = 2.4 V to 3.6 V

TA = 25 °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.

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