STM32F401 datasheet(109/135 Pages) STMICROELECTRONICS

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STM32F401xD STM32F401xE

Electrical characteristics

114

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

being performed on another analog input. It is recommended to add a Schottky diode (pin to

ground) to analog pins which may potentially inject negative currents.

Any positive injection current within the limits specified for IINJ(PIN) and ΣIINJ(PIN) in

Section 6.3.16 does not affect the ADC accuracy.

Table 70. 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 by characterization, not tested in production.

Table 71. 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 by characterization, not tested in production.

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