STM32WB55 datasheet(151/193 Pages) STMICROELECTRONICS

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DS11929 Rev 11

151/193

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

T = total unajusted error: maximum deviation

between the actual and ideal transfer curves

O = offset error: maximum deviation between the

first actual transition and the first ideal one

G = gain error: deviation between the last ideal

transition and the last actual one

D = differential linearity error: maximum deviation

between actual steps and the ideal one

L = integral linearity error: maximum deviation

between any actual transition and the end point

correlation line

(1) Example of an actual transfer curve

(2) Ideal transfer curve

(3) End-point correlation line

2n-1

2n-2

2n-3

72n-3

2n-2

2n-1

REF+ (or VDDA)

Output code

1 LSB IDEAL

(1)

(3)

(2)

MS19880V4

= ADC resolution

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