WM8580 datasheet(35/97 Pages) WOLFSON

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Production Data

WM8580

PD Rev 4.3 August 2007

MUTE MODES

The WM8580 has individual mutes for each of the three 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 and DMUTE[2] mutes DAC3 channel. Setting the

MUTEALL register bit will apply a 'soft-mute’ to the input of all the DAC digital filters. A soft-mute

allows the user to control the analog output of the DAC such that the output waveform is looks like

that shown in Figure 23.

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.

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

DMUTE[2:0]

000

DAC channel soft mute

enables:

DMUTE[0] = 1, enable soft-

mute on DAC1.

DMUTE[1] = 1, enable soft-

mute on DAC2.

DMUTE[2] = 1, enable soft-

mute on DAC3.

MUTEALL

DAC channel master soft mute.

Mutes all DAC channels:

0 = disable soft-mute on all

DACs.

1 = enable soft-mute on all

DACs.

R19

DAC Control 5

13h

MPDENB

MUTE pin decode enable:

0 = MUTE activates soft-mute

on DAC selected by DZFM

1 = MUTE activates softmute

on all DACs

Table 26 Mute Registers

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