STM32WB15CC datasheet(107/127 Pages) STMICROELECTRONICS

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DS13258 Rev 4

107/127

STM32WB15CC

Electrical characteristics

115

Figure 22. ADC accuracy characteristics

SNR

Signal-to-noise

ratio

VDDA = 3 V, fADC = 35 MHz, 

fs ≤ 2.5 Msps, TA = 25 °C

63.0

64.0

2 V < VDDA < 3.6 V, fADC = 35 MHz,

fs ≤ 2.5 Msps, TA = entire range

60.0

64.0

1.62 V < VDDA < 3.6 V, TA = entire range, 

fADC = 35 MHz, fs ≤ 2.2 Msps

60.0

64.0

THD

Total harmonic

distortion

VDDA = 3 V, fADC = 35 MHz, 

fs ≤ 2.5 Msps, TA = 25 °C

--74

-73

2 V < VDDA < 3.6 V, fADC = 35 MHz,

fs ≤ 2.5 Msps, TA = entire range

--74

-70

1.62 V < VDDA < 3.6 V, TA = entire range, 

fADC = 35 MHz, fs ≤ 2.2 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 the A-to-D conversion of signals 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 is enabled (BOOSTEN = 1 in the SYSCFG_CFGR1) when VDDA < 2.4 V and disabled

when VDDA ≥ 2.4 V.

Table 71. 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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