WM8595 datasheet(30/82 Pages) WOLFSON

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WM8595

Production Data

PD, Rev 4.2, January 2011

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DAC1_CTRL1

02h

DAC1

_ZCEN

DAC Digital Volume Control Zero Cross

Enable

0 = Do not use zero cross

1 = Use zero cross

DAC2_CTRL1

07h

DAC2

_ZCEN

Table 17 DAC Digital Volume Control

SOFTMUTE

A soft mute can be applied to DAC1 and DAC2 independently.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DAC1_CTRL1

02h

DAC1_

MUTE

DAC Softmute

0 = Normal operation

1 = Softmute applied

DAC2_CTRL1

07h

DAC2_

MUTE

Table 18 DAC Softmute Control

-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)

Figure 18 Application and Release of DAC Soft Mute

Figure 18 shows the applications and release of DAC soft mute whilst a full amplitude sinusoid is

being played at 48kHz sampling rate. When DACx_MUTE (lower trace) is asserted, the output

(upper trace) of the appropriate DAC will decay exponentially from the DC level of the last input

sample towards VMID2C with a time constant of approximately 64 input samples.

When

DACx_MUTE is de-asserted, the output will restart immediately from the current input sample.

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