WM8352 datasheet(77/336 Pages) WOLFSON

77 / 336 page

Production Data

WM8352

PD, February 2011, Rev 4.4

The volume ramp rate during soft mute and un-mute is controlled by the DAC_MUTERATE bit.

Ramp rates of fs/32 and fs/2 are selectable as shown

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R58 (3Ah)

DAC Mute

DAC_MUTE

DAC Mute

0 = disabled

1 = enabled

R59 (3Bh)

DAC Mute

Volume

DAC_MUTEM

ODE

DAC Soft Mute Mode

0 = Disabling soft-mute

(DAC_MUTE=0) will cause the volume

to change immediately to the

DACL_VOL / DACR_VOL settings

1 = Disabling soft-mute

(DAC_MUTE=0) will cause the volume

to ramp up gradually to the DACL_VOL

/ DACR_VOL settings

DAC_MUTER

ATE

DAC Soft Mute Ramp Rate

0 = Fast ramp (24kHz at fs=48k,

providing maximum delay of 10.7ms)

1 = Slow ramp (1.5kHz at fs=48k,

providing maximum delay of 171ms)

Table 33 DAC Soft-Mute Control

13.7.3

DAC DE-EMPHASIS

Digital de-emphasis can be applied to the DAC playback data (e.g. when the data comes from a CD

with pre-emphasis used in the recording). De-emphasis filtering is available for sample rates of

48kHz, 44.1kHz and 32kHz.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R48 (30h)

DAC Control

5:4

DEEMP [1:0]

De-Emphasis Control

11 = 48kHz sample rate

10 = 44.1kHz sample rate

01 = 32kHz sample rate

00 = No de-emphasis

Table 34 DAC De-Emphasis Control

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