STM32F446RC datasheet(143/202 Pages) STMICROELECTRONICS

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STM32F446xC/E

Electrical characteristics

175

Note:

ADC accuracy vs. negative injection current: injecting a negative current on any analog

input pins should be avoided as this significantly reduces the accuracy of the conversion

Table 76. ADC static 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 based on test during characterization.

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

±3

Differential linearity error

±1

±2

Integral linearity error

±1.5

±3

Table 77. ADC static 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 based on test during characterization.

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

Table 78. ADC dynamic accuracy at fADC = 18 MHz - limited test conditions(1)

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

ENOB

Effective number of bits

fADC =18 MHz

VDDA = VREF+= 1.7 V

Input Frequency = 20 KHz

Temperature = 25 °C

10.3

10.4

bits

SINAD

Signal-to-noise and distortion ratio

64.2

SNR

Signal-to-noise ratio

THD

Total harmonic distortion

-67

-72

1. Guaranteed based on test during characterization.

Table 79. ADC dynamic accuracy at fADC = 36 MHz - limited test conditions(1)

Symbol

Parameter

Test conditions

Min

Typ

Max

Unit

ENOB

Effective number of bits

fADC =36 MHz

VDDA = VREF+ = 3.3 V

Input Frequency = 20 KHz

Temperature = 25 °C

10.6

10.8

bits

SINAD

Signal-to noise and distortion ratio

SNR

Signal-to noise ratio

THD

Total harmonic distortion

- 70

- 72

1. Guaranteed based on test during characterization.

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