WM8952ECSSLASHRV datasheet(65/72 Pages) WOLFSON

65 / 72 page

Pre Production

WM8952

PP, Rev 3.1, June 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

Table 48 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 49 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

Table 49 Total Group Delay

Notes

Wind noise filter is disabled.

ADC FILTER RESPONSES

-120

-100

-80

-60

-40

-20

0.5

1.5

2.5

Frequency (Fs)

-0.2

-0.15

-0.1

-0.05

0.05

0.1

0.15

0.2

0.1

0.2

0.3

0.4

0.5

Frequency (Fs)

Figure 32 ADC Digital Filter Frequency Response

Figure 33 ADC Digital Filter Ripple

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