Datasheet

ManualsBrandsST ManualsEmbedded Processors & ControllersMicrocontroller 32bit 256KB LQFP
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DS10198 Rev 8 189/270
STM32L476xx Electrical characteristics
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Figure 32. ADC accuracy characteristics
Figure 33. Typical connection diagram using the ADC
1. Refer to Table 76: ADC characteristics for the values of R
AIN
 and C
ADC
.
2. C
parasitic
 represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the 
pad capacitance (refer to Table 70: I/O static characteristics for the value of the pad capacitance). A high 
C
parasitic
 value will downgrade conversion accuracy. To remedy this, f
ADC
 should be reduced.
3. Refer to Table 70: I/O static characteristics for the values of I
lkg
.
General PCB design guidelines
Power supply decoupling should be performed as shown in Figure 20: Power supply 
scheme. The 10 nF capacitor should be ceramic (good quality) and it should be placed as 
close as possible to the chip.
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
MS33900V5
Sample and hold ADC converter
12-bit 
converter
C
parasitic
(2)
I
lkg 
(3)
 
V
T
C
ADC
V
DDA
R
AIN
(1)
V
AIN
V
T
AINx
R
ADC
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