STM32G071C8 datasheet(90/133 Pages) STMICROELECTRONICS

90 / 133 page

Electrical characteristics

STM32G071x8/xB

90/133

DS12232 Rev 3

Figure 24. ADC accuracy characteristics

Figure 25. Typical connection diagram using the ADC

1. Refer to Table 56: ADC characteristics for the values of RAIN and CADC.

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

pad capacitance (refer to Table 51: I/O static characteristics for the value of the pad capacitance). A high

Cparasitic value will downgrade conversion accuracy. To remedy this, fADC should be reduced.

3. Refer to Table 51: I/O static characteristics for the values of Ilkg.

General PCB design guidelines

Power supply decoupling should be performed as shown in Figure 13: Power supply

scheme. The 100 nF capacitor should be ceramic (good quality) and it should be placed as

close as possible to the chip.

MSv19880V3

(1) Example of an actual transfer curve

(2) Ideal transfer curve

(3) End point correlation line

4095

4094

4093

345

4093 4094

4095

1 LSB ideal

(1)

(3)

(2)

Code

(VAIN / VREF+)*4095

ET total unadjusted error: maximum deviation

between the actual and ideal transfer curves.

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 ones.

EL integral linearity error: maximum deviation between

any actual transition and the end point correlation line.

EO offset error: maximum deviation between the

first actual transition and the first ideal one.

MS33900V5

Sample and hold ADC converter

12-bit

converter

Cparasitic

(2)

Ilkg

(3)

CADC

VDDA

RAIN

(1)

VAIN

AINx

RADC

STM32G071C8 データシート(PDF) 90 Page - STMicroelectronics

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