STM32W108CB datasheet(248/278 Pages) STMICROELECTRONICS

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Electrical characteristics

STM32W108HB STM32W108CC STM32W108CB STM32W108CZ

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Doc ID 16252 Rev 14

14.5

ADC characteristics

Table 56 describes the key ADC parameters measured at 25°C and VDD_PADS at 3.0 V, for

a sampling clock of 1 MHz. HVSELP and 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).

SMP[2:0]

Conversion Time (µs)

Nyquist Freq (kHz)

3 dB Cut-off (kHz)

INL (codes peak)

INL (codes RMS)

1.435

2.848

DNL (codes peak)

0.028

0.035

0.038

0.044

0.074

0.113

0.184

0.333

DNL (codes RMS)

0.008

0.009

0.011

0.014

0.019

0.029

0.048

0.079

ENOB (from single-cycle

test)

SNR (dB)

Single-Ended

Differential

SINAD (dB)

Single-Ended

Differential

SDFR (dB)

Single-Ended

Differential

THD (dB)

Single-Ended

Differential

ENOB (from SNR)

Single-Ended

Differential

ENOB (from SINAD)

Single-Ended

Differential

Equivalent ADC Bits

Table 56.

ADC module key parameters for 1 MHz sampling(1)

INL and DNL are referenced to a LSB of the Equivalent ADC Bits shown in the last row of Table 56. ENOB

(effective number of bits) can be calculated from either SNR (signal to non-harmonic noise ratio) or SINAD

(signal-to-noise and distortion ratio).

Parameter

Performance

456

128

256

512

1024

2048

4096

15.6

7.81

3.91

1.95

0.977

0.488

0.244

0.122

9.43

4.71

2.36

1.18

0.589

0.295

0.147

0.0737

0.083

0.092

0.163

0.306

0.624

1.229

2.451

4.926

0.047

0.051

0.093

0.176

0.362

0.719

5.6

7.0

8.6

10.1

11.5

12.6

13.0

13.2

-45

-54

-62

-63

-67

-71

-69

-75

-69

-76

-69

-76

5.6

7.1

8.6

10.0

10.1

11.3

11.4

12.2

12.5

12.4

12.9

12.5

12.9

5.5

5.6

7.0

8.5

9.9

10.0

10.9

11.3

11.2

12.1

11.3

12.3

11.3

12.4

7 [15:9]

8 [15:8]

[15:7]

[15:6]

[15:5]

[15:4]

[15:3]

[15:2]

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