WM8940CGEFLSLASHRV datasheet(83/91 Pages) WOLFSON

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Production Data

WM8940

PD, Rev 4.3, November 2011

DIGITAL FILTER CHARACTERISTICS

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ADC Filter

Passband

+/- 0.025dB

0.454fs

-6dB

0.5fs

Passband Ripple

+/- 0.025

Stopband

0.546fs

Stopband Attenuation

f > 0.546fs

-60

Group Delay

21/fs

ADC High Pass Filter

High Pass Filter Corner

Frequency

-3dB

3.7

-0.5dB

10.4

-0.1dB

21.6

DAC Filter

Passband

+/- 0.035dB

0.454fs

-6dB

0.5fs

Passband Ripple

+/-0.035

Stopband

0.546fs

Stopband Attenuation

f > 0.546fs

-55

Group Delay

29/fs

Table 61 Digital Filter Characteristics

TERMINOLOGY

Stop Band Attenuation (dB) – the degree to which the frequency spectrum is attenuated (outside audio band)

Pass-band Ripple – any variation of the frequency response in the pass-band region

Note that this delay applies only to the filters and does not include additional delays through other digital circuits. See

Table 62 for the total delay.

PARAMETER

MIN

TYP

MAX

UNIT

Total Delay (ADC analogue

input to digital audio interface

output)

28/fs

30/fs

32/fs

Total Delay (Audio interface

input to DAC analogue

output)

33/fs

35/fs

37/fs

Table 62 Total Group Delay

Note:

Wind noise filter is disabled.

WM8940CGEFL/RV 数据表(PDF) 83 Page - Wolfson Microelectronics plc

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