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STM32F401XB Datasheet, PDF (107/135 Pages) STMicroelectronics – ARM Cortex-M4 32b MCU+FPU, 105 DMIPS, 256KB Flash/64KB RAM, 11 TIMs, 1 ADC, 11 comm. interfaces
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Electrical characteristics
STM32F401xB STM32F401xC
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
10.3 10.4 - bits
SINAD
Signal-to-noise and distortion
ratio
fADC =18 MHz
VDDA = VREF+= 1.7 V
64 64.2 -
SNR
Signal-to-noise ratio
Input Frequency = 20 KHz
Temperature = 25 °C
64 65
-
dB
THD
Total harmonic distortion
-67 -72 -
1. Guaranteed by characterization.
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
10.6 10.8 - bits
SINAD
Signal-to noise and distortion
ratio
VDDA = VREF+ = 3.3 V
Input Frequency =
66
67
-
SNR
Signal-to noise ratio
20 KHz
64 68
-
dB
THD
Total harmonic distortion
Temperature = 25 °C
-70 -72
-
1. Guaranteed by characterization.
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.
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