STM32F378RC datasheet(97/131 Pages) STMICROELECTRONICS

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STM32F378xx

Electrical characteristics

110

Equation 1: RSRC max formula

The formula above (Equation 1) is used to determine the maximum external signal source

impedance allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).

Table 60. RSRC max for fADC = 14 MHz(1)

1. Guaranteed by design.

Ts (cycles)

tS (µs)

RSRC 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 61. ADC accuracy(1)(2) (3)

1. ADC DC accuracy values are measured after internal calibration.

Symbol

Parameter

Test conditions

Typ

Max(4)

Unit

Total unadjusted error

fADC = 14 MHz, RSRC < 10 kΩ,

VDDA = 3 V to 3.6 V

TA = 25 °C

±1.3

±3

LSB

Offset error

±1

±2

Gain error

±0.5

±1.5

Differential linearity error

±0.7

±1

Integral linearity error

±0.8

±1.5

Total unadjusted error

fADC = 14 MHz, RSRC < 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

fADC = 14 MHz, RSRC < 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

RSRC

fADC CADC

()

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

RADC

–

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