STM32F373VC datasheet(99/137 Pages) STMICROELECTRONICS

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DocID022691 Rev 7

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STM32F373xx

Electrical characteristics

114

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 61. 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 62. 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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