STM32WB35CEU6A datasheet(151/196 Pages) STMICROELECTRONICS

151 / 196 page

DS11929 Rev 14

151/196

STM32WB55xx STM32WB35xx

Electrical characteristics

169

Figure 29. ADC accuracy characteristics

THD

Total

harmonic

distortion

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 that may potentially inject negative current.

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

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

Table 82. ADC accuracy - Limited test conditions 4(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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