STM32WL55JC datasheet(122/147 Pages) STMICROELECTRONICS

122 / 147 page

Electrical characteristics

STM32WL55/54xx

122/147

DS13293 Rev 2

Figure 22. ADC accuracy characteristics

THD

Total

harmonic

distortion

VDDA = VREF+ = 3 V, fADC = 35 MHz, fs ≤ 2.5 Msps, TA = 25 °C

-74

-73

2 V < VDDA, VREF+ < 3.6 V,

fADC = 35 MHz, fs ≤ 2.5 Msps, TA = entire range

--74

-70

1.62 V < VDDA = VREF+ < 3.6 V, TA = entire range

Range 1: fADC = 35 MHz, fs ≤ 2.2 Msps

Range 2: fADC = 16 MHz, fs ≤ 1.1 Msps

--74

-70

1. Based on characterization results, not tested in production.

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

3. Injecting negative current on any analog input pin significantly reduces the accuracy of A-to-D conversion of signal on

another analog input. It is recommended to add a Schottky diode (pin to ground) to analog pins susceptible to receive

negative current.

4. I/O analog switch voltage booster enabled (BOOSTEN = 1 in the SYSCFG_CFGR1) when VDDA < 2.4 V and disabled when

VDDA ≥ 2.4 V.

Table 82. ADC accuracy(1)(2)(3) (continued)

Symbol

Parameter

Conditions(4)

Min Typ Max Unit

MSv19880V6

(1) Example of an actual transfer curve

(2) Ideal transfer curve

(3) End-point correlation line

n = ADC resolution

ET = total unadjusted error: maximum deviation

between the actual and ideal transfer curves

EO = offset error: maximum deviation between the first

actual transition and the first ideal one

EG = gain error: deviation between the last ideal

transition and the last actual one

ED = differential linearity error: maximum deviation

between actual steps and the ideal one

EL = integral linearity error: maximum deviation between

any actual transition and the end point correlation line

n-1

Output code

VSSA

n-2

n-3

VREF+ (VDDA)

1 LSB ideal

(1)

(2)

(3)

(or

)]

[1LSB =

VDDA

VREF+

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