WM8904ECSSLASHR datasheet(69/188 Pages) WOLFSON

69 / 188 page

Pre-Production

WM8904

PP, Rev 3.3, September 2012

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R33 (21h)

DAC Digital 1

DAC_MUTERA

DAC Soft Mute Ramp Rate

0 = Fast ramp (fs/2, maximum ramp

time is 10.7ms at fs=48k)

1 = Slow ramp (fs/32, maximum ramp

time is 171ms at fs=48k)

DAC_UNMUTE

_RAMP

DAC Soft Mute Mode

0 = Disabling soft-mute

(DAC_MUTE=0) will cause the DAC

volume to change immediately to

DACL_VOL and DACR_VOL settings

1 = Disabling soft-mute

(DAC_MUTE=0) will cause the DAC

volume to ramp up gradually to the

DACL_VOL and DACR_VOL settings

DAC_MUTE

DAC Soft Mute Control

0 = DAC Un-mute

1 = DAC Mute

Table 35 DAC Soft-Mute Control

DAC MONO MIX

A DAC digital mono-mix mode can be enabled using the DAC_MONO register bit. This mono mix will

be output on whichever DAC is enabled. To prevent clipping, a -6dB attenuation is automatically

applied to the mono mix.

The mono mix is only supported when one or other DAC is disabled. When the mono mix is selected,

then the mono mix is output on the enabled DAC only; there is no output from the disabled DAC. If

DACL_ENA and DACR_ENA are both set, then stereo operation applies.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R33 (21h)

DAC Digital 1

DAC_MONO

DAC Mono Mix

0 = Stereo

1 = Mono (Mono mix output on

enabled DAC)

Table 36 DAC Mono Mix

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. See “Digital Filter Characteristics” for details of de-emphasis filter

characteristics.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R33 (21h)

DAC Digital 1

2:1

DEEMPH [1:0]

DAC De-Emphasis Control

00 = No de-emphasis

01 = 32kHz sample rate

10 = 44.1kHz sample rate

11 = 48kHz sample rate

Table 37 DAC De-Emphasis Control

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