STM32WB10CCU5 datasheet(95/110 Pages) STMICROELECTRONICS

95 / 110 page

DS13259 Rev 2

95/110

STM32WB10CC

Electrical characteristics

102

Figure 19. ADC accuracy characteristics

Figure 20. Typical connection diagram when using the ADC

with FT/TT pins featuring analog switch function

1. Refer to Table 66: ADC characteristics for the values of RAIN, RADC and CADC.

2. Cparasitic represents the capacitance of the PCB (dependent on soldering and PCB layout quality) plus the

pad capacitance (refer to Table 61: I/O static characteristics for the value of the pad capacitance). A high

Cparasitic value downgrades the conversion accuracy. To remedy this fADC must be reduced.

3. Refer to Table 61: I/O static characteristics for the values of Ilkg.

4. Refer to Figure 10: Power supply scheme.

General PCB design guidelines

Power supply decoupling has to be performed as shown in Figure 10: Power supply

scheme. The 10 nF capacitor must be ceramic (good quality), placed as close as possible to

the chip.

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+

MSv67871V3

Sample-and-hold ADC converter

Converter

Cparasitic

(2)

Ilkg

(3)

CADC

VDDA

(4)

RAIN

(1)

VAIN

RADC

VREF+

(4)

VSSA

I/O

analog

switch

Sampling

switch with

multiplexing

VSS

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