STM32L100RB datasheet(84/103 Pages) STMICROELECTRONICS

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Electrical characteristics

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Figure 22. ADC accuracy characteristics

Figure 23. Typical connection diagram using the ADC

1. Refer to Table 55: Maximum source impedance RAIN max for the value of RAIN and Table 53: ADC

characteristics for the value of CADC

2. Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the

pad capacitance (roughly 7 pF). A high Cparasitic value will downgrade conversion accuracy. To remedy

this, fADC should be reduced.

Total unadjusted error

1.8 V ≤ VDDA ≤ 2.4 V

fADC = 4 MHz, RAIN = 50 Ω

TA = -40 to 85 ° C

-2

LSB

Offset error

1.5

Gain error

1.5

2.5

Differential linearity error

Integral linearity error

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 IINJ(PIN) and ΣIINJ(PIN) in Section 6.3.12 does not affect the ADC

accuracy.

3. Guaranteed by characterization results.

Table 54. ADC accuracy(1)(2) (continued)

Symbol

Parameter

Test conditions

Min(3)

Typ

Max(3)

Unit

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