WM8581 datasheet(38/100 Pages) WOLFSON

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WM8581

Production Data

PD Rev 4.0 April 2007

BIT

LABEL

DEFAULT

DESCRIPTION

3:0

DMUTE[3:0]

0000

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.

DMUTE[3] = 1, enable soft-

mute on DAC4.

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

Figure 24 Application and Release of Mute

Figure 24 shows the application and release of MUTE whilst a full amplitude sinusoid is being played

at 48kHz sampling rate. When MUTE (lower trace) is asserted, the output (upper trace) begins to

decay exponentially from the DC level of the last input sample. The output will decay towards VMID

with a time constant of approximately 64 input samples. If MUTE is applied to all channels for 1024

or more input samples the DAC will be muted if IZD is set. When MUTE is de-asserted, the output

will restart immediately from the current input sample.

All other means of muting the DAC channels will cause a much more abrupt muting of the output.

-2.5

-2

-1.5

-1

-0.5

0.5

1.5

0.001

0.002

0.003

0.004

0.005

0.006

Time(s)

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