Datasheet

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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 I
INJ(PIN)
and ΣI
INJ(PIN)
in
Section 6.3.16 does not affect the ADC accuracy.
Table 70. ADC dynamic accuracy at f
ADC
= 18 MHz - limited test conditions
(1)
Symbol Parameter Test conditions Min Typ Max Unit
ENOB Effective number of bits
f
ADC
=18 MHz
V
DDA
= V
REF+
= 1.7 V
Input Frequency = 20 KHz
Temperature = 25 °C
10.3 10.4 - bits
SINAD Signal-to-noise and distortion ratio 64 64.2 -
dBSNR Signal-to-noise ratio 64 65 -
THD Total harmonic distortion
-67 -72 -
1. Guaranteed by characterization, not tested in production.
Table 71. ADC dynamic accuracy at f
ADC
= 36 MHz - limited test conditions
(1)
Symbol Parameter Test conditions Min Typ Max Unit
ENOB Effective number of bits
f
ADC
= 36 MHz
V
DDA
= V
REF+
= 3.3 V
Input Frequency = 20 KHz
Temperature = 25 °C
10.6 10.8 - bits
SINAD Signal-to noise and distortion ratio 66 67 -
dBSNR Signal-to noise ratio 64 68 -
THD Total harmonic distortion
-70 -72 -
1. Guaranteed by characterization, not tested in production.
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