Datasheet

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STM32L15xCC STM32L15xRC STM32L15xUC STM32L15xVC Electrical characteristics
111
Table 57. ADC accuracy
(1)(2)
Symbol Parameter Test conditions Min
(3)
Typ Max
(3)
Unit
ET Total unadjusted error
2.4 V 
V
DDA
3.6 V
2.4 V 
V
REF+
3.6 V
f
ADC
= 8 MHz, R
AIN
= 50 
T
A
= -40 to 105 C
-24
LSB
EO Offset error - 1 2
EG Gain error - 1.5 3.5
ED Differential linearity error - 1 2
EL Integral linearity error - 1.7 3
ENOB Effective number of bits
2.4 V 
V
DDA
3.6 V
V
DDA
= V
REF+
f
ADC
= 16 MHz, R
AIN
= 50 
T
A
= -40 to 105 C
F
input
=10kHz
9.2 10 - bits
SINAD
Signal-to-noise and
distortion ratio
57.5 62 -
dB
SNR Signal-to-noise ratio 57.5 62 -
THD Total harmonic distortion - -70 -65
ENOB Effective number of bits
1.8 V 
V
DDA
2.4 V
V
DDA
= V
REF+
f
ADC
= 8 MHz or 4 MHz, R
AIN
= 50 
T
A
= -40 to 105 C
F
input
=10kHz
9.2 10 - bits
SINAD
Signal-to-noise and
distortion ratio
57.5 62 -
dB
SNR Signal-to-noise ratio 57.5 62 -
THD Total harmonic distortion - -70 -65
ET Total unadjusted error
2.4 V 
V
DDA
3.6 V
1.8 V  V
REF+
2.4 V
f
ADC
= 4 MHz, R
AIN
= 50 
T
A
= -40 to 105 C
-46.5
LSB
EO Offset error - 2 4
EG Gain error - 4 6
ED Differential linearity error - 1 2
EL Integral linearity error - 1.5 3
ET Total unadjusted error
1.8 V 
V
DDA
2.4 V
1.8 V 
V
REF+
2.4 V
f
ADC
= 4 MHz, R
AIN
= 50 
T
A
= -40 to 105 C
-23
LSB
EO Offset error - 1 1.5
EG Gain error - 1.5 2
ED Differential linearity error - 1 2
EL Integral linearity error - 1 1.5
1. ADC DC accuracy values are measured after internal calibration.
2. ADC accuracy vs. negative injection current: Injecting a negative current on any 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 analog pins which may potentially inject negative currents. 
Any positive injection current within the limits specified for I
INJ(PIN)
and I
INJ(PIN)
in Section 6.3.12 does not affect the ADC
accuracy.
3. Based on characterization, not tested in production.