WM8533 datasheet(25/41 Pages) WOLFSON

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Production Data

WM8533

PD, July 2012, Rev 4.0

DIGITAL VOLUME CONTROL

The WM8533 DAC includes digital volume control, allowing the digital gain to be adjusted between

−100dB and +12dB in 0.25dB steps. Volume update bits allow the user to write both left and right

channel volume changes before the volume is updated.

Note that digital volume control is only available in I

2C mode.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R6 (06h)

DAC_GAINL

DACL_VU

DAC Digital Volume Update

0 = Latch DAC volume setting into Register

Map but do not update volume

1 = Latch DAC volume setting into Register

Map and update left and right channels

simultaneously

R7 (07h)

DAC_GAINR

DACR_VU

R6 (06h)

DAC_GAINL

8:0

DACL_VOL

[8:0]

190h

DAC Digital Volume

000h = −100dB

001h = −99.75dB

002h = −99.5dB

…0.25dB steps

190h = 0dB

…0.25dB steps

1BEh = +11.75dB

1BFh to 1FFh = +12dB

R7 (07h)

DAC_GAINR

8:0

DACR_VOL

[8:0]

190h

Table 13 DAC Digital Volume Control

VOLUME CHANGE MODES

Volume can be adjusted by step change (either using zero cross or not) or by soft ramp. The volume

change mode is controlled by the DAC_VOL_DOWN_RAMP and DAC_VOL_UP_RAMP bits in R5:

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

DAC_CTRL3

DAC_VOL

_UP_RAM

DAC Digital Volume Increase Control

0 = Apply volume increases instantly (step)

1 = Ramp volume increases

DAC_VOL

_DOWN_

RAMP

DAC Digital Volume Decrease Control

0 = Apply volume decreases instantly (step)

1 = Ramp volume decreases

Table 14 Volume Ramp Control

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