Datasheet
DocID025936 Rev 8 93/143
STM32L052x6 STM32L052x8 Electrical characteristics
112
Equation 1: R
AIN
max formula
The simplified formula above (Equation 1) is used to determine the maximum external
impedance allowed for an error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).
R
AIN
T
S
f
ADC
C
ADC
2
N2+
()ln××
----------------------------------------------------------------
R
ADC
–<
Table 64. R
AIN
max for f
ADC
= 16 MHz
(1)
T
s
(cycles)
t
S
(µs)
R
AIN
max for
fast channels
(kΩ)
R
AIN
max for standard channels (kΩ)
V
DD
>
2.7 V
V
DD
>
2.4 V
V
DD
>
2.0 V
V
DD
>
1.8 V
V
DD
>
1.75 V
V
DD
> 1.65 V
and
T
A
> −10 °C
V
DD
> 1.65 V
and
T
A
> 25 °C
1.5 0.09 0.5 < 0.1 NA NA NA NA NA NA
3.5 0.22 1 0.2 < 0.1 NA NA NA NA NA
7.5 0.47 2.5 1.7 1.5 < 0.1 NA NA NA NA
12.5 0.78 4 3.2 3 1 NA NA NA NA
19.5 1.22 6.5 5.7 5.5 3.5 NA NA NA < 0.1
39.5 2.47 13 12.2 12 10 NA NA NA 5
79.5 4.97 27 26.2 26 24 < 0.1 NA NA 19
160.5 10.03 50 49.2 49 47 32 < 0.1 < 0.1 42
1. Guaranteed by design.
Table 65. ADC accuracy
(1)(2)(3)
Symbol Parameter Conditions Min Typ Max Unit
ET Total unadjusted error
1.65 V < V
DDA
= V
REF+
< 3.6 V,
range 1/2/3
-2 4
LSB
EO Offset error - 1 2.5
EG Gain error - 1 2
EL Integral linearity error - 1.5 2.5
ED Differential linearity error - 1 1.5
ENOB
Effective number of bits 10.2 11
bits
Effective number of bits (16-bit mode
oversampling with ratio =256)
(4)
11.3 12.1 -
SINAD Signal-to-noise distortion 63 69 -
dBSNR
Signal-to-noise ratio 63 69 -
Signal-to-noise ratio (16-bit mode
oversampling with ratio =256)
(4)
70 76 -
THD Total harmonic distortion - -85 -73
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