STM32U5A5QJ datasheet(281/382 Pages) STMICROELECTRONICS

281 / 382 page

DS13543 Rev 1

281/382

STM32U5Axxx

Electrical characteristics

348

Figure 38. Typical connection diagram when using the ADC

with FT/TT pins featuring analog switch function

1. Refer to the ADCx characteristic table 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 86: 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 86: I/O static characteristics for the values of Ilkg.

4. Refer to Section 5.1.6: Power supply scheme.

General PCB design guidelines

The power-supply decoupling must be performed as shown in the corresponding

power-supply scheme. The 100 nF capacitor must be ceramic (good quality) and must be

placed as close as possible to the chip.

5.3.19

12-bit analog-to-digital converter (ADC4) characteristics

Unless otherwise specified, the parameters given in the table below are values derived from

tests performed under ambient temperature, fHCLK frequency and VDDA supply voltage

conditions summarized in Table 33.

Note:

It is recommended to perform a calibration after each power-up.

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

Table 99. 12-bit ADC4 characteristics(1)(2)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog power supply for ADC

-1.62

3.6

VREF+

Positive reference voltage

VDDA

VREF-

Negative reference voltage

VSSA

fADC

ADC clock frequency

1.62 V ≤ VDDA ≤ 3.6 V

0.14

MHz

ADC clock duty cycle

Sampling rate

Resolution = 12 bits

0.01

2.75

Msps

Resolution = 10 bits

0.012

3.05

Resolution = 8 bits

0.014

3.43

Resolution = 6bits

0.0175

3.92

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