WM8533 datasheet(27/41 Pages) WOLFSON

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Production Data

WM8533

PD, July 2012, Rev 4.0

Step Volume Changes and Zero Cross

The step volume control includes optional zero cross functionality. When zero cross is enabled, by

setting DAC_ZC=1, volume changes are not applied until the signal crosses zero so no discontinuity

is seen in the output signal. Zero cross helps to prevent pop and click noise when changing volume

settings and is therefore recommended if using step volume changes.

The zero cross function includes a timeout which forces volume changes if a zero cross event does

not occur. The timeout period is 14400 samples, equivalent to 300ms at 48kHz sample rate.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

DAC_CTRL3

DAC_ZC

Zero Cross Enable

0 = Do not use zero cross

1 = Use zero cross

Table 16 Zero Cross Control

Table 17 gives a summary of the volume mode settings and their effect.

DAC_VOL_

UP_RAMP

DAC_VOL_

DOWN_RAMP

DAC_ZC

VOLUME CHANGE

DOWN

Step, no zero cross

Ramp

Step, no zero cross

Ramp

Step, use zero cross

Ramp

Step, use zero cross

Ramp

Table 17 Volume Change Summary

MUTE

A digital mute can be applied to left and right channels independently.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R5 (05h)

DAC_CTRL3

DACR_MU

Right DAC Mute

0 = Normal operation

1 = Mute

DACL_MUT

Left DAC Mute

0 = Normal operation

1 = Mute

Table 18 DAC Mute Control

The DAC mute function in software mode is controlled by the register settings DAC_VOL_UP_RAMP,

DAC_VOL_DOWN_RAMP and DAC_ZC as described in Table 17.

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