STM32L431 datasheet(143/200 Pages) STMICROELECTRONICS

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STM32L431xx

Electrical characteristics

168

Figure 30. ADC accuracy characteristics

THD

Total

harmonic

distortion

ADC clock frequency ≤

26 MHz,

1.65 V ≤ VDDA = VREF+ ≤

3.6 V,

Voltage scaling Range 2

Single

ended

Fast channel (max speed)

-71

-69

Slow channel (max speed)

-71

-69

Differential

Fast channel (max speed)

-73

-72

Slow channel (max speed)

-73

-72

1. Guaranteed by design.

2. ADC DC accuracy values are measured after internal calibration.

3. ADC accuracy vs. negative Injection Current: Injecting 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 current.

4. The I/O analog switch voltage booster is enable when VDDA < 2.4 V (BOOSTEN = 1 in the SYSCFG_CFGR1 when

VDDA < 2.4 V). It is disable when VDDA ≥ 2.4 V. No oversampling.

Table 69. ADC accuracy - limited test conditions 4(1)(2)(3) (continued)

Sym-

bol

Parameter

Conditions(4)

Min Typ Max Unit

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