WM8581 datasheet(37/100 Pages) WOLFSON

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Production Data

WM8581

PD Rev 4.0 April 2007

BIT

LABEL

DEFAULT

DESCRIPTION

R19

DAC CONTROL 5

13h

DZCEN

DAC Digital Volume Zero Cross

Enable

0 = Zero Cross detect disabled

1 = Zero Cross detect enabled

Table 25 Digital Zero Cross Register

MUTE MODES

The WM8581 has individual mutes for each of the four DAC channels. Setting DMUTE for a channel

will apply a ‘soft-mute’ to the input of the digital filters for that channel. DMUTE[0] mutes DAC1

channel, DMUTE[1] mutes DAC2 channel, DMUTE[2] mutes DAC3 channel and DMUTE[3] mutes

DAC4 channel. Setting the MUTEALL register bit will apply a ‘soft-mute’ to the input of all the DAC

digital filters.

The MUTE pin can also be used to apply soft-mute to the DAC selected by the DZFM register bits.

However, if the MPDENB register bit is set, the MUTE pin will activate a soft-mute for all DACs. The

interaction of the various mute controls is shown in Figure 23.

DZFM

Selector

zflag1

zflag2

zflag3

MUTE

(pin)

MUTE

(register)

Decode

IZD

MPDENB

DMUTE(3:0)

MUTEALL

DAC1 i/p

DAC2 i/p

DAC3 i/p

DZFM (2:0)

1024

Zeros

Detect

PL(3:0)

DACPD(3:0)

LDAx/RDAx

(Digital volume)

Volume

(register)

Decode

DAC4 i/p

zflag4

Channel 1

Analogue

Mute

Channel 2

Analogue

Mute

Channel 3

Analogue

Mute

Channel 4

Analogue

Mute

Channel 1

Softmute

Channel 2

Softmute

Channel 3

Softmute

Channel 4

Softmute

DAC_SRC[1:0] = 00

PCM_N or

AUDIO_N = 1

DAC_SRC[1:0] = 00

UNLOCK = 1

Figure 23 Mute Circuit Diagram

WM8581 Datasheet(PDF) 37 Page - Wolfson Microelectronics plc

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