WM8581 datasheet(39/100 Pages) WOLFSON

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Production Data

WM8581

PD Rev 4.0 April 2007

DE-EMPHASIS MODE

A digital de-emphasis filter may be applied to each DAC channel. The de-emphasis filter for each

stereo channel is enabled under the control of DEEMP[3:0]. DEEMP[0] enables the de-emphasis

filter for DAC 1, DEEMP[1] enables the de-emphasis filter for DAC 2, DEEMP[2] enables the de-

emphasis filter for DAC 3 and DEEMP[3] enables the de-emphasis filter for DAC 4.

BIT

LABEL

DEFAULT

DESCRIPTION

3:0

DEEMP[3:0]

0000

De-emphasis mode select:

DEEMP[0] = 1, enable De-

emphasis on DAC1.

DEEMP[1] = 1, enable De-

emphasis on DAC2.

DEEMP[2] = 1, enable De-

emphasis on DAC3.

DEEMP[3] = 1, enable De-

emphasis on DAC4.

R17

DAC CONTROL 3

11h

DEEMPALL

0 = De-emphasis controlled by

DEEMP[3:0]

1 = De-emphasis enabled on all

DACs

Table 27 De-emphasis Register

Refer to, Figure 41, Figure 42, Figure 43 and Figure 44 for details of the De-Emphasis modes at

different sample rates.

DAC OUTPUT PHASE

The DAC Phase control word determines whether the output of each DAC is non-inverted or inverted

BIT

LABEL

DEFAULT

DESCRIPTION

R18

DAC CONTROL 4

12h

7:0

PHASE

[7:0]

11111111

Controls phase of DAC outputs

0 = inverted

1 = non-inverted

PHASE[0] = 0 inverts phase of

DAC1L output

PHASE[1] = 0 inverts phase of

DAC1R output

PHASE[2] = 0 inverts phase of

DAC2L output

PHASE[3] = 0 inverts phase of

DAC2R output

PHASE[4] = 0 inverts phase of

DAC3L output

PHASE[5] = 0 inverts phase of

DAC3R output

PHASE[6] = 0 inverts phase of

DAC4L output

PHASE[7] = 0 inverts phase of

DAC4R output

Table 28 DAC Output Phase Register

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