STM32W108HB datasheet(162/179 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32W108CB, STM32W108HB

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Doc ID 16252 Rev 2

12.4.3

Low frequency internal clock characteristics

12.4.4

Low frequency external clock characteristics

12.4.5

ADC characteristics

Table 37 describes the key ADC parameters measured at 25°C and VDD_PADS at 3.0 V, for

a sampling clock of 1 MHz. ADC_HVSELP and ADC_HVSELN are programmed to 0 to

disable the input buffer. The single-ended measurements were done at finput = 7.7% fNyquist;

0 dBFS level (where full-scale is a 1.2 V p-p swing). The differential measurements were

done at finput = 7.7% fNyquist; -6 dBFS level (where full-scale is a 2.4 V p-p swing).

Table 35.

Low-frequency RC oscillator specification

Parameter

Test conditions

Min

Typ

Max

Unit

Nominal Frequency

After trimming

kHz

Analog trim step size

kHz

Supply dependence

For a voltage drop from 3.6 V

to 3.1 V or 2.6 V to 2.1 V

(without re-calibration)

Frequency dependence

Frequency variation with

temperature for a change

from -40 oC to +85oC

(without re-calibration)

Table 36.

Low-frequency crystal oscillator specification

Parameter

Test conditions

Min

Typ

Max

Unit

Frequency

32.768

kHz

Accuracy

Initial, temperature, and

ageing

-100

+100

ppm

Load cap xin

Load cap xout

Crystal ESR

100

Start-up time

Current consumption

At 25°C, VDD_PADS=3.0 V

0.5

µA

Table 37.

ADC module key parameters for 1 MHz sampling

Parameter

Performance

ADC_PERIOD

Conversion Time (µs)

128

256

512

1024

2048

4096

Nyquist Freq (kHz)

15.6

7.81

3.91

1.95

0.977

0.488

0.244

0.122

3 dB Cut-off (kHz)

9.42

4.71

2.36

1.18

0.589

0.294

0.147

0.0736

INL (codes peak)

0.04

0.05

0.09

0.2

0.3

0.6

1.2

INL (codes RMS)

0.02

0.03

0.05

0.1

0.2

0.4

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