Electrical characteristics
Table 69. ADC accuracy
STM32F302xx/STM32F303xx
Min (4) Max(4) Unit
(1)(2)(3)
(continued)
Conditions
Symbol
Parameter
Fast channel 5.1 Ms
Slow channel 4.8 Ms
Fast channel 5.1 Ms
Slow channel 4.8 Ms
-
-
-
-
63
63
67
67
Single Ended
Differential
Signal-to-
noise and
distortion ratio
SINAD
Fast channel 5.1 Ms
Slow channel 4.8 Ms
Fast channel 5.1 Ms
Slow channel 4.8 Ms
64
64
67
67
-
-
-
ADC clock freq.
Single Ended
Differential
≤ 72 MHz,
Signal-to-
noise ratio
Sampling freq. ≤ 5
SNR
THD
dB
Msps,
2V ≤ VDDA , VREF+
≤
3.6 V
-
Fast channel 5.1 Ms
Slow channel 4.8 Ms
Fast channel 5.1 Ms
Slow channel 4.8 Ms
-
-
-
-
−71
−69
−73
−70
Single Ended
Differential
Total
harmonic
distortion
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 IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.14 does not affect the ADC
accuracy.
3. Better performance may be achieved in restricted VDDA, frequency and temperature ranges.
4. Data based on characterization results, not tested in production.
Figure 32. ADC accuracy characteristics
V
V
DDA
REF+
[1LSB
=
(or
depending on package)]
IDEAL
4096
4096
E
G
(1) Example of an actual transfer curve
(2) The ideal transfer curve
4095
4094
4093
(3) End point correlation line
(2)
E =Total Unadjusted Error: maximum deviation
T
E
between the actual and the ideal transfer curves.
T
(3)
7
6
5
4
3
2
1
E =Offset Error: deviation between the first actual
O
(1)
transition and the first ideal one.
E =Gain Error: deviation between the last ideal
G
transition and the last actual one.
E
E
O
L
E =Differential Linearity Error: maximum deviation
D
between actual steps and the ideal one.
E =Integral Linearity Error: maximum deviation
L
E
between any actual transition and the end point
correlation line.
D
1 LSB
IDEAL
0
1
2
3
4
5
6
7
4093 4094 4095 4096
V
V
DDA
SSA
ai14395b
110/133
Doc ID 023353 Rev 5
STMICROELECTRONICS [ ST ]
