Datasheet

DocID027107 Rev 6 143/202
STM32F446xC/E Electrical characteristics
175
a
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
Table 76. ADC static accuracy at f
ADC
= 30 MHz
(1)
1. Better performance could be achieved in restricted V
DD
, frequency and temperature ranges.
Symbol Parameter Test conditions Typ Max
(2)
2. Guaranteed based on test during 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 77. ADC static accuracy at f
ADC
= 36 MHz
(1)
1. Better performance could be achieved in restricted V
DD
, frequency and temperature ranges.
Symbol Parameter Test conditions Typ Max
(2)
2. Guaranteed based on test during 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
Table 78. 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 based on test during characterization.
Table 79. 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 based on test during characterization.
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