STM32F103C4H6ATR STMICROELECTRONICS [STMicroelectronics], STM32F103C4H6ATR Datasheet - Page 64

• Manufacturer Part Number: STM32F103C4H6ATR
• Description: Low-density performance line, ARM-based 32-bit MCU with 16 or 32 KB Flash, USB, CAN, 6 timers, 2 ADCs, 6 communication interfaces
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

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Equation 1: R
The formula above
error below 1/4 of LSB. Here N = 12 (from 12-bit resolution).
Table 46.
1. Based on characterization, not tested in production.
Table 47.
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-
3. Based on characterization, not tested in production.
1.5
7.5
13.5
28.5
41.5
55.5
71.5
239.5
Symbol
R
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.
EO
EG
ED
ET
EL
AIN

------------------------------------------------------------- - R
f
T
Total unadjusted error
Offset error
Gain error
Differential linearity error
Integral linearity error
ADC
s
R
ADC accuracy - limited test conditions
(cycles)
AIN
AIN

C
(Equation
Parameter
ADC
max for f
max formula:
T
S

ln

1) is used to determine the maximum external impedance allowed for an
2
ADC
N
+
Doc ID 15060 Rev 3
0.11
0.54
0.96
2.04
2.96
3.96
5.11
17.1
2

= 14 MHz
–
f
f
V
T
Measurements made after
ADC calibration
ADC
PCLK2
ADC
A
DDA
= 25 °C
= 14 MHz, R
(1)
= 3 V to 3.6 V
t
= 56 MHz,
S
Test conditions
(µs)
INJ(PIN)
AIN
(1) (2)
and  I
< 10 k,
INJ(PIN)
0.4
5.9
11.4
25.2
37.2
50
NA
NA
in
±1.3
±0.5
±0.7
±0.8
Typ
±1
Section 5.3.12
R
AIN
max (k)
Max
±1.5
±1.5
±1.5
±1
±2
(3)
does not
Unit
LSB