Datasheet

DS10690 Rev 6 99/144
STM32L071xx Electrical characteristics
111
Figure 29. ADC accuracy characteristics
ET Total unadjusted error
1.65 V < V
REF+
<V
DDA
< 3.6 V,
range 1/2/3
-2 5
LSB
EO Offset error - 1 2.5
EG Gain error - 1 2
EL Integral linearity error - 1.5 3
ED Differential linearity error - 1 2
ENOB Effective number of bits 10.0 11.0 - bits
SINAD Signal-to-noise distortion 62 69 -
dBSNR Signal-to-noise ratio 61 69 -
THD Total harmonic distortion - -85 -65
1. ADC DC accuracy values are measured after internal calibration.
2. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-robust) 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 standard analog pins which may potentially inject
negative current.
Any positive injection current within the limits specified for I
INJ(PIN)
and ΣI
INJ(PIN)
in Section 6.3.12 does not affect the ADC
accuracy.
3. Better performance may be achieved in restricted V
DDA
, frequency and temperature ranges.
4. This number is obtained by the test board without additional noise, resulting in non-optimized value for oversampling mode.
Table 64. ADC accuracy
(1)(2)(3)
(continued)
Symbol Parameter Conditions Min Typ Max Unit
ET = total unajusted error: maximum deviation
between the actual and ideal transfer curves.
E
O = offset error: maximum 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 ones.
E
L = integral linearity error: maximum deviation
between any actual transition and the end point
correlation line.
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
4095
4094
4093
7
6
5
4
3
2
1
0
23456
1
7 4093
4094 4095
4096
VDDA
VSSA
EO
ET
EL
EG
ED
1 LSB IDEAL
(1)
(3)
(2)
MS19880V2
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