STM32L431 datasheet(132/200 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32L431xx

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DocID028800 Rev 1

6.3.17

Analog-to-Digital converter characteristics

Unless otherwise specified, the parameters given in Table 64 are preliminary values derived

from tests performed under ambient temperature, fPCLK frequency and VDDA supply voltage

conditions summarized in Table 21: General operating conditions.

Note:

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

Table 64. ADC characteristics(1) (2)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

VDDA

Analog supply voltage

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

Range 1

MHz

Range 2

Sampling rate for FAST

channels

Resolution = 12 bits

5.33

Msps

Resolution = 10 bits

6.15

Resolution = 8 bits

7.27

Resolution = 6 bits

8.88

Sampling rate for SLOW

channels

Resolution = 12 bits

4.21

Resolution = 10 bits

4.71

Resolution = 8 bits

5.33

Resolution = 6 bits

6.15

fTRIG

External trigger frequency

fADC = 80 MHz

Resolution = 12 bits

5.33

MHz

Resolution = 12 bits

1/fADC

VCMIN

Input common mode

Differential mode

(VREF++

VREF-)/2

- 0.18

(VREF++

VREF-)/2

(VREF++

VREF-)/2

+ 0.18

VAIN (3)

Conversion voltage

range(2)

-0

VREF+

RAIN

External input impedance

kΩ

CADC

Internal sample and hold

capacitor

tSTAB

Power-up time

conversion

cycle

tCAL

Calibration time

fADC = 80 MHz

1.45

µs

-116

1/fADC

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