Datasheet

DocID027973 Rev 5 83/119
STM32L011x3/4 Electrical characteristics
93
Figure 27. ADC accuracy characteristics
ET Total unadjusted error
1.65 V < V
DDA
< 3.6 V, range
1/2/3, TSSOP14 package
-3 5
LSB
EO Offset error - 2 2.5
EG Gain error - 2 2.5
EL Integral linearity error - 1.5 2.5
ED Differential linearity error - 1 1.7
ENOB
Effective number of bits 9.5 10.5 -
bits
Effective number of bits (16-bit mode
oversampling with ratio =256)
(5)
10.7 11.6 -
SINAD Signal-to-noise distortion 59 65 -
dBSNR
Signal-to-noise ratio 59 65 -
Signal-to-noise ratio (16-bit mode
oversampling with ratio =256)
(5)
66 73 -
THD Total harmonic distortion - -75 -63
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. In TSSOP14 package, where V
DDA
pin is shared with V
DD
pin, I/O toggling should be minimized to reach the values given in
the above table. I/O toggling with loaded I/O pins can generate ripple on V
DD
/V
DDA
and degrade the ADC accuracy.
5. This number is obtained by the test board without additional noise, resulting in non-optimized value for oversampling mode.
Table 56. ADC accuracy
(1)(2)(3)(4)
Symbol Parameter Conditions Min Typ Max Unit
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