STM32F401CD datasheet(108/135 Pages) STMICROELECTRONICS

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Electrical characteristics

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

allowed for an error below 1/4 of LSB. N = 12 (from 12-bit resolution) and k is the number of

sampling periods defined in the ADC_SMPR1 register.

Table 67. ADC accuracy at fADC = 18 MHz(1)

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

Symbol

Parameter

Test conditions

Typ

Max(2)

2. Guaranteed by characterization, not tested in production.

Unit

Total unadjusted error

fADC =18 MHz

VDDA = 1.7 to 3.6 V

VREF = 1.7 to 3.6 V

VDDA − VREF < 1.2 V

±3

±4

LSB

Offset error

±2

±3

Gain error

±1

±3

Differential linearity error

±1

±2

Integral linearity error

±2

±3

Table 68. ADC accuracy at fADC = 30 MHz(1)

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

Symbol

Parameter

Test conditions

Typ

Max(2)

2. Guaranteed by characterization, not tested in production.

Unit

Total unadjusted error

fADC = 30 MHz,

RAIN < 10 kΩ,

VDDA = 2.4 to 3.6 V,

VREF = 1.7 to 3.6 V,

VDDA − VREF < 1.2 V

±2

±5

LSB

Offset error

±1.5

±2.5

Gain error

±1.5

±4

Differential linearity error

±1

±2

Integral linearity error

±1.5

±3

Table 69. ADC accuracy at fADC = 36 MHz(1)

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

Symbol

Parameter

Test conditions

Typ

Max(2)

2. Guaranteed by characterization, not tested in production.

Unit

Total unadjusted error

fADC =36 MHz,

VDDA = 2.4 to 3.6 V,

VREF = 1.7 to 3.6 V

VDDA − VREF < 1.2 V

±4

±7

LSB

Offset error

±2

±3

Gain error

±3

±6

Differential linearity error

±2

±3

Integral linearity error

±3

±6

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