WM8711SEDSSLASHR datasheet(17/47 Pages) WOLFSON

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Production Data

WM8711 / WM8711L

PD Rev 4.4 April 2007

AUDIO SIGNAL PATH

DAC FILTERS

The DAC filters perform true 24 bit signal processing to convert the incoming digital audio data from

the digital audio interface at the specified sample rate to multi-bit oversampled data for processing by

the analogue DAC. Figure 6 illustrates the DAC digital filter path.

FROM DIGITAL

AUDIO

INTERFACE

MUTE

DIGITAL

INTERPOLATION

FILTER

TO LINE

OUTPUTS

DIGITAL

DE_EMPHASIS

DEEMP

DACMU

Figure 6 DAC Filter Schematic

The DAC digital filter can apply digital de-emphasis under software control, as shown in Table 3. The

DAC can also perform a soft mute where the audio data is digitally brought to a mute level. This

removes any abrupt step changes in the audio that might otherwise result in audible clicks in the

audio outputs.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

2:1

DEEMP[1:0]

De-emphasis Control

(Digital)

11 = 48kHz

10 = 44.1kHz

01 = 32kHz

00 = Disable

0000101

Digital Audio

Path Control

DACMU

DAC Soft Mute Control

(Digital)

1 = Enable soft mute

0 = Disable soft mute

Note 1

Table 3 DAC Software Control

Note 1

Not valid when SR[3:0] = 1111 or 0111.

To ensure correct DACMU operation at fs = 88.2kHz, set SR[3:0] = 1000.

To ensure correct DACMU operation at fs = 96kHz, set SR[3:0] = 0000.

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