STM32F051R4T6TR STMicroelectronics, STM32F051R4T6TR Datasheet - Page 78

• Manufacturer Part Number: STM32F051R4T6TR
• Description: ARM Microcontrollers - MCU ARM Cortex M0 16kB 48 MHz CPU 8kB Flash
• Manufacturer: STMicroelectronics

Specifications of STM32F051R4T6TR

• Rohs: yes

STM32F051x
Figure 22. ADC accuracy characteristics
4095
4094
4093
7
6
5
4
3
2
1
0
V
SSA
1
E
2. ADC Accuracy vs. Negative Injection Current: Injecting negative current on any of the standard (non-
3. Better performance may be achieved in restricted V
4. Data based on characterization results, not tested in production.
Figure 23. Typical connection diagram using the ADC
1. Refer to
2. C
General PCB design guidelines
Power supply decoupling should be performed as shown in
should be ceramic (good quality) and it should be placed as close as possible to the chip.
O
1 LSB
2
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
affect the ADC accuracy.
pad capacitance (roughly 7 pF). A high C
this, f
parasitic
IDEAL
3
ADC
V AIN
Table 54
represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the
should be reduced.
4
R AIN (1)
V
DDA
5
1 LSB
for the values of R
E
6
C parasitic
T
IDEAL
E
AINx
7
L
(2)
Doc ID 022265 Rev 3
E
D
AIN
4093 4094 4095 4096
(3)
, R
parasitic
ADC
0.6 V
0.6 V
V T
V T
(1)
and C
value will downgrade conversion accuracy. To remedy
E
DDA
G
ADC
V
I L ±1 μA
DDA
, frequency and temperature ranges.
.
INJ(PIN)
(1) Example of an actual transfer curve
(2) The ideal transfer curve
(3) End point correlation line
between the actual and the ideal transfer curves.
transition and the first ideal one.
transition and the last actual one.
between actual steps and the ideal one.
between any actual transition and the end point
correlation line.
=Total Unadjusted Error: maximum deviation
=Integral Linearity Error: maximum deviation
=Differential Linearity Error: maximum deviation
=Offset Error: deviation between the first actual
=Gain Error: deviation between the last ideal
R ADC (1)
Sample and hold ADC
converter
and ΣI
Figure
INJ(PIN)
C ADC (1)
converter
Electrical characteristics
12-bit
10. The 10 nF capacitor
in
Section 6.3.13
does not
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