Datasheet

Electrical characteristics STM32L052x6 STM32L052x8
94/143 DocID025936 Rev 8
Figure 27. 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 65. ADC accuracy
(1)(2)(3)
(continued)
Symbol Parameter Conditions Min Typ Max Unit
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