STM32F100X4 Datasheet, PDF (67/84 Pages) STMicroelectronics – Low & medium-density value line, advanced ARM-based 32-bit MCU Low & medium-density value line, advanced ARM-based 32-bit MCU

STM32F100x4, STM32F100x6, STM32F100x8, STM32F100xB
Electrical characteristics
Note:
The above formula (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).
Table 42. R_AIN max for f_ADC = 12 MHz⁽¹⁾
T_s (cycles)
t_S (µs)
1.5
0.125
7.5
0.625
13.5
1.125
28.5
2.375
41.5
3.45
55.5
4.625
71.5
5.96
239.5
20
1. Guaranteed by design, not tested in production.
0.4
5.9
11.4
25.2
37.2
50
NA
NA
R_AIN max (k)
Table 43.
Symbol
ADC accuracy - limited test conditions⁽¹⁾⁽²⁾
Parameter
Test conditions
ET Total unadjusted error
EO Offset error
EG Gain error
ED Differential linearity error
EL Integral linearity error
f_PCLK2 = 24 MHz,
f_ADC = 12 MHz, R_AIN < 10 k,
V_DDA = 3 V to 3.6 V
T_A = 25 °C
Measurements made after
ADC calibration
1. ADC DC accuracy values are measured after internal calibration.
2. Based on characterization, not tested in production.
Typ
±1.3
±1
±0.5
±0.7
±0.8
Max Unit
±2
±1.5
±1.5 LSB
±1
±1.5
Table 44.
Symbol
ADC accuracy^{(1) (2)}
Parameter
Test conditions
Typ
Max⁽³⁾
ET Total unadjusted error
EO Offset error
EG Gain error
ED Differential linearity error
EL Integral linearity error
f_PCLK2 = 24 MHz,
f_ADC = 12 MHz, R_AIN < 10 k,
V_DDA = 2.4 V to 3.6 V
Measurements made after
ADC calibration
±2
±1.5
±1.5
±1
±1.5
±5
±2.5
±3
±2
±3
1. ADC DC accuracy values are measured after internal calibration.
2. Better performance could be achieved in restricted V_DD, frequency, V_REF and temperature ranges.
3. Based on characterization, not tested in production.
Unit
LSB
ADC accuracy vs. negative injection current: Injecting a negative current on any of the
standard (non-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
Doc ID 16455 Rev 2
67/84