STM32U545NET6QTR datasheet(217/283 Pages) STMICROELECTRONICS

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DS14216 Rev 1

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STM32U545xx

Electrical characteristics

258

5.3.18

14-bit analog-to-digital converter (ADC1) 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.

Table 103. 14-bit ADC1 characteristics(1)(2)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog power supply for

ADC ON

-1.62

3.6

VREF+

Positive reference

voltage

VDDA ≥ 2 V

VDDA

VDDA < 2 V

VDDA

VREF-

Negative reference

voltage

-VSSA

fADC

ADC clock frequency

1.62 V ≤ VDDA ≤ 3.6 V

5(3)

-55

MHz

ADC clock ratio

Sampling rate

Resolution = 14 bits

0.23

2.5

Msps

Resolution = 12 bits

0.25

2.75

Resolution = 10 bits

0.28

3.05

Resolution = 8 bits

0.31

3.44

tTRIG

External trigger period

Resolution = 14 bits

1/fADC

VAIN(4)

Conversion voltage

range

-0

VREF+

VCIMV

Common mode input

voltage

-VREF+/2 - 10% VREF+/2 VREF+/2 + 10%

RAIN(5)

External input

impedance

Resolution = 14 bits

Tj = 130 °C

1000

Ω

Resolution = 12 bits

Tj = 130 °C

1000

Resolution = 10 bits

Tj = 130 °C

4700

Resolution = 8 bits

Tj = 130 °C

22000

CADC

Internal sample and

hold capacitor

tADCVREG_

STUP

ADC LDO startup time

µs

tSTAB

ADC power-up time

LDO already started

(3 × 1/fADC) + 1 conversion

Cycle

tCAL

Offset and linearity

calibration time

25502

1/fADC

tOFF_CAL

Offset calibration time

683

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