WM8768

Production Data

w

PD Rev 4.1 March 2005

28

INFINITE ZERO DETECT

When it is set, the IZD register causes an analogue mute of the DAC channel output amplifier both

when there are 1024 zeros on that channel’s DIN pin or when it is manually muted by DMUTE or

MUTEALL.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0000010

DAC Channel Control

4

IZD

0

IZD Enable

0 : Disable infinite zero mute

1: Enable infinite zero mute

This operation is only available in software mode and can sometimes create a very small click at the

output of the device.

DE-EMPHASIS MODE

Each stereo DAC channel has an individual de-emphasis control bit:

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0001001

DAC De-emphahsis

Control

[8:6]

DEEMPH

[2:0]

000

DAC 3, 2 and 1 De-emphasis

channel selection select:

0001111

DAC4 Control

4

DEEMPH4

0

DAC 4 De-emphasis channel

selection select:

{DEEMPH4,DEEMPH

[2:0]}

DAC

CHANNEL 4

DAC

CHANNEL 3

DAC

CHANNEL 2

DAC

CHANNEL 1

0000

Not-DEEMPH

Not-DEEMPH

Not-DEEMPH

Not-DEEMPH

0001

Not-DEEMPH

Not-DEEMPH

Not-DEEMPH

DEEMPH

0010

Not-DEEMPH

Not-DEEMPH

DEEMPH

Not-DEEMPH

0011

Not-DEEMPH

Not-DEEMPH

DEEMPH

DEEMPH

0100

Not-DEEMPH

DEEMPH

Not-DEEMPH

Not-DEEMPH

0101

Not-DEEMPH

DEEMPH

Not-DEEMPH

DEEMPH

0110

Not-DEEMPH

DEEMPH

DEEMPH

Not-DEEMPH

0111

Not-DEEMPH

DEEMPH

DEEMPH

DEEMPH

1000

DEEMPH

Not-DEEMPH

Not-DEEMPH

Not-DEEMPH

1001

DEEMPH

Not-DEEMPH

Not-DEEMPH

DEEMPH

1010

DEEMPH

Not-DEEMPH

DEEMPH

Not-DEEMPH

1011

DEEMPH

Not-DEEMPH

DEEMPH

DEEMPH

1100

DEEMPH

DEEMPH

Not-DEEMPH

Not-DEEMPH

1101

DEEMPH

DEEMPH

Not-DEEMPH

DEEMPH

1110

DEEMPH

DEEMPH

DEEMPH

DEEMPH

1111

DEEMPH

DEEMPH

DEEMPH

DEEMPH

Table 14 De-emphasis Control

Refer to Figure 25, Figure 26, Figure 27, Figure 28, Figure 29 and Figure 30 for details of the De-

Emphasis performance at different sample rates.

REGISTER ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

0000010

DAC DEEMPH

1

DEEMP

ALL

0

DEEMPH Select:

0 : Normal Operation

1: De-emphasis all channels