STM32U535NET3QTR datasheet(218/278 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32U535xx

218/278

DS14217 Rev 1

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 32.

Note:

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

Table 104. 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 = 6 bits

0.0175

3.92

tTRIG

External trigger period

Resolution = 12 bits

1/fADC

VAIN(3)

Conversion voltage range

VREF+

RAIN(4)

External input impedance

Tj = 130 °C

Resolution = 12 bits

2.2

kΩ

Resolution = 10 bits

6.8

Resolution = 8 bits

33.0

Resolution = 6 bits

47.0

CADC

Internal sample and hold

capacitor

tADCVREG_

STUP

ADC LDO startup ready flag time

µs

tSTAB

ADC power-up time

LDO already started

(3 × 1/fADC) + 1 conversion

Cycle

tOFF_CAL Offset calibration time

1/fADC

tLATR

Trigger conversion latency

WAIT = 0, AUTOFF = 0,

DPD = 0, fADC = HCLK

WAIT = 0, AUTOFF = 0,

DPD = 0, fADC = HCLK/2

WAIT = 0, AUTOFF = 0,

DPD = 0, fADC = HCLK/4

3.75

Sampling time

1.5

814.5

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