STM32F401CB datasheet(107/134 Pages) STMICROELECTRONICS

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STM32F401xB STM32F401xC

Electrical characteristics

113

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)

1. Guaranteed by characterization.

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

Table 71. ADC dynamic accuracy at fADC = 36 MHz - limited test conditions(1)

1. Guaranteed by characterization.

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

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