WM8569

Product Preview

w

PP Rev 1.1 December 2005

24

DAC OUTPUT PHASE

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

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0000011

DAC Phase

6

PHASE

0

0 = non-inverted

1 = inverted

DIGITAL ZERO CROSS-DETECT

The Digital volume control also incorporates a zero cross detect circuit which detects a transition

through the zero point before updating the digital volume control with the new volume. This is

enabled by control bit ZCD.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0001001

DAC Control

0

ZCD

0

DAC Digital Volume Zero Cross

Disable:

0: Zero cross detect enabled

1: Zero cross detect disabled

DAC MUTE MODES

The WM8569 has a mute for the DAC channels. Setting MUTE will apply a ‘soft’ mute to the input of

the digital filters.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0001001

DAC Mute

3

DMUTE

0

DAC Soft Mute Select

0 = Not mute

1 = Mute

Refer to Figure 7 for the plot of application and release of soft mute.

Note that all other means of muting the DAC channels: setting the PL[3:0] bits to 0, setting the

PDWN bit or setting attenuation to 0 will cause much more abrupt muting of the output.