WM8985GEFLSLASHR datasheet(55/118 Pages) WOLFSON

55 / 118 page

Pre-Production

WM8985

PP, Rev 3.4, October 2006

Figure 23 DAC Digital Filter Path

The analogue outputs from the DACs can then be mixed with the aux analogue inputs and the ADC

analogue inputs. The mix is fed to the output drivers for headphone (LOUT1/ROUT1,

LOUT2/ROUT2) or line (OUT3/OUT4). OUT3 and OUT4 have additional mixers which allow them to

output different signals to the line outputs or back into the record path.

DIGITAL PLAYBACK (DAC) PATH

Digital data is passed to the WM8985 via the flexible audio interface and is then passed through a

variety of advanced digital filters as shown in Figure 23 to the hi-fi DACs. The DACs are enabled by

the DACENL/R register bits.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DACENL

Left channel DAC enable

0 = DAC disabled

1 = DAC enabled

R3 (03h)

Power

Management 3

DACENR

Right channel DAC enable

0 = DAC disabled

1 = DAC enabled

Table 21 DAC Enable Control

The WM8985 also has a Soft Mute function, which when enabled, gradually attenuates the volume

of the digital signal to zero. When disabled, the gain will ramp back up to the digital gain setting. This

function is enabled by default. To play back an audio signal, it must first be disabled by setting the

SOFTMUTE bit to zero.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DACPOL

Left DAC output polarity:

0 = non-inverted

1 = inverted (180 degrees phase shift)

DACRPOL

Right DAC output polarity:

0 = non-inverted

1 = inverted (180 degrees phase shift)

AMUTE

Automute enable

0 = Amute disabled

1 = Amute enabled

DACOSR128

DAC oversampling rate:

0 = 64x (lowest power)

1 = 128x (best performance)

R10 (0Ah)

DAC Control

SOFTMUTE

Softmute enable:

0 = Enabled

1 = Disabled

Table 22 DAC Control Register

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