Datasheet
Electrical characteristics STM32F303xB STM32F303xC
110/133 DocID023353 Rev 7
Figure 31. ADC accuracy characteristics
SINAD
Signal-to-
noise and
distortion
ratio
ADC clock freq. 72 MHz,
Sampling freq. 5 Msps,
2 V V
DDA
, V
REF+
3.6 V
Single
Ended
Fast channel 5.1 Ms - 63
dB
Slow channel 4.8 Ms - 63
Differential
Fast channel 5.1 Ms - 67
Slow channel 4.8 Ms - 67
SNR
Signal-to-
noise ratio
Single
Ended
Fast channel 5.1 Ms 64 -
Slow channel 4.8 Ms 64 -
Differential
Fast channel 5.1 Ms 67 -
Slow channel 4.8 Ms 67 -
THD
Tot al
harmonic
distortion
Single
Ended
Fast channel 5.1 Ms - -71
Slow channel 4.8 Ms - -69
Differential
Fast channel 5.1 Ms - -73
Slow channel 4.8 Ms - -70
1. ADC DC accuracy values are measured after internal calibration.
2. ADC accuracy vs. negative Injection Current: Injecting 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 current.
Any positive injection current within the limits specified for I
INJ(PIN)
and I
INJ(PIN)
in Section 6.3.14 does not affect the ADC
accuracy.
3. Better performance may be achieved in restricted V
DDA
, frequency and temperature ranges.
4. Data based on characterization results, not tested in production.
Table 69. ADC accuracy (continued)
(1)(2)(3)
Symbol Parameter Conditions Min
(4)
Max
(4)
Unit
E
O
E
G
1LSB
IDEAL
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
E
T
=Total Unadjusted Error: maximum deviation
between the actual and the ideal transfer curves.
E
O
=Offset Error: deviation between the first actual
transition and the first ideal one.
E
G
=Gain Error: deviation between the last ideal
transition and the last actual one.
E
D
=Differential Linearity Error: maximum deviation
between actual steps and the ideal one.
E
L
=Integral Linearity Error: maximum deviation
between any actual transition and the end point
correlation line.
4095
4094
4093
5
4
3
2
1
0
7
6
1234567
4093 4094 4095 4096
(1)
(2)
E
T
E
D
E
L
(3)
V
DDA
V
SSA
ai14395b
V
REF+
4096
(or depending on package)]
V
DDA
4096
[1LSB
IDEAL
=