Datasheet

Electrical characteristics STM32F401xB STM32F401xC
106/139 DS9716 Rev 11
Equation 1: R
AIN
max formula
The formula above (Equation 1) is used to determine the maximum external impedance
allowed for an error below 1/4 of LSB. N = 12 (from 12-bit resolution) and k is the number of
sampling periods defined in the ADC_SMPR1 register.
Table 67. ADC accuracy at f
ADC
= 18 MHz
Symbol Parameter Test conditions Typ Max
(1)
1. Guaranteed by characterization.
Unit
ET Total unadjusted error
f
ADC
=18 MHz
V
DDA
= 1.7 to 3.6 V
V
REF
= 1.7 to 3.6 V
V
DDA
− V
REF
< 1.2 V
±3 ±4
LSB
EO Offset error ±2 ±3
EG Gain error ±1 ±3
ED Differential linearity error ±1 ±2
EL Integral linearity error ±2 ±3
Table 68. ADC accuracy at f
ADC
= 30 MHz
Symbol Parameter Test conditions Typ Max
(1)
1. Guaranteed by characterization.
Unit
ET Total unadjusted error
f
ADC
= 30 MHz,
R
AIN
< 10 kΩ,
V
DDA
= 2.4 to 3.6 V,
V
REF
= 1.7 to 3.6 V,
V
DDA
− V
REF
< 1.2 V
±2 ±5
LSB
EO Offset error ±1.5 ±2.5
EG Gain error ±1.5 ±3
ED Differential linearity error ±1 ±2
EL Integral linearity error ±1.5 ±3
Table 69. ADC accuracy at f
ADC
= 36 MHz
Symbol Parameter Test conditions Typ Max
(1)
1. Guaranteed by characterization.
Unit
ET Total unadjusted error
f
ADC
=36 MHz,
V
DDA
= 2.4 to 3.6 V,
V
REF
= 1.7 to 3.6 V
V
DDA
− V
REF
< 1.2 V
±4 ±7
LSB
EO Offset error ±2 ±3
EG Gain error ±3 ±6
ED Differential linearity error ±2 ±3
EL Integral linearity error ±3 ±6
R
AIN
k0.5–()
f
ADC
C
ADC
2
N 2+
()ln××
---------------------------------------------------------------- R
ADC
–=
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