WM8595 datasheet(38/82 Pages) WOLFSON

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WM8595

Production Data

PD, Rev 4.2, January 2011

DIGITAL VOLUME CONTROL

The ADC digital volume can be adjusted between +30dB and -97dB in 0.5dB steps. Left and right

channels can be controlled independently. Volume changes can be applied immediately to each

channel, or volume changes can be written to both channels before writing to an update bit in order

to change the volume in both channels simultaneously.

Volume control includes optional zero cross functionality. When zero cross is enabled, volume

changes are not applied until the output level crosses the DC level of the ADC output. Zero cross

helps to prevent pop and click noise when changing volume settings.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R16

ADCL_VOL

10h

7:0

ADCL

_VOL[7:0]

11000011

ADC Digital Volume

0000 0000 = Digital mute

0000 0001 = -97dB

0000 0010 = -96.5dB

…0.5dB steps

1100 0011 = 0dB

…0.5dB steps

1111 1110 = +29.5dB

1111 1111 = +30dB

R17

ADCR_VOL

11h

7:0

ADCR

_VOL[7:0]

11000011

R16

ADCL_VOL

10h

ADCL_VU

ADC Digital Volume Update

0 = Latch ADC volume setting into Register

Map but do not update volume

1 = Latch ADC volume setting into Register

Map and update left and right channels

simultaneously

R17

ADCR_VOL

11h

ADCR_VU

R13

ADC_CTRL1

0Dh

ADC_ZC_

ADC Digital Volume Control Zero Cross

Enable

0 = Do not use zero cross, change volume

instantly

1 = Use zero cross, change volume when

data crosses zero

Table 29 ADC Digital Volume Control

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