Datasheet

Electrical characteristics STM32F334x4 STM32F334x6 STM32F334x8
94/121 DocID025409 Rev 8
Figure 29. ADC accuracy characteristics
Table 68. ADC accuracy
(1)(2)
at 1MSPS
Symbol Parameter Test conditions Typ. Max
(3)
Unit
ET Total unadjusted error
ADC Freq. ≤ 72 MHz
Sampling Freq. ≤ 1MSPS
2.4 V ≤ V
DDA
= V
REF+
≤ 3.6 V
Single-ended mode
Fast channel ±2.5 ±5
LSB
Slow channel ±3.5 ±5
EO Offset error
Fast channel ±1 ±2.5
Slow channel ±1.5 ±2.5
EG Gain error
Fast channel ±2 ±3
Slow channel ±3 ±4
ED Differential linearity error
Fast channel ±0.7 ± 2
Slow channel ±0.7 ±2
EL Integral linearity error
Fast channel ±1 ±3
Slow channel ±1.2 ±3
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 must 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 ∑IINJ(PIN) in Section 6.3.14: I/O port characteristics does not affect the ADC
accuracy.
3. Data based on characterization results, not tested in production.
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
123456 7
4093 4094 4095 4096
(1)
(2)
E
T
E
D
E
L
(3)
V
DDA
V
SSA
V
DDA
4096
1LSB
IDEAL
=
MS34980V1
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