WM8994ECSSLASHR datasheet(100/363 Pages) CIRRUS

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WM8994

100

Rev 4.6

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1058 (0422h)

AIF1 DAC2

Filters (1)

AIF1DAC2_

MUTE

AIF1DAC2 input path (AIF1, Timeslot 1) Soft

Mute Control

0 = Un-mute

1 = Mute

AIF1DAC2_

MUTERAT

AIF1DAC2 input path (AIF1, Timeslot 1) 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)

(Note: ramp rate scales with sample rate.)

AIF1DAC2_

UNMUTE_

RAMP

AIF1DAC2 input path (AIF1, Timeslot 1)

Unmute Ramp select

0 = Disabling soft-mute (AIF1DAC2_MUTE=0)

will cause the volume to change immediately to

AIF1DAC2L_VOL and AIF1DAC2R_VOL

settings

1 = Disabling soft-mute (AIF1DAC2_MUTE=0)

will cause the DAC volume to ramp up

gradually to the AIF1DAC2L_VOL and

AIF1DAC2R_VOL settings

Table 40 AIF1 Input Path Soft Mute Control

AIF1 - INPUT PATH MONO MIX AND DE-EMPHASIS FILTER

A digital mono mix can be selected on one or both pairs of AIF1 input channels. The mono mix is

generated as the sum of the Left and Right AIF channel data. When the mono mix function is enabled,

the combined mono signal is applied to the Left channel and the Right channel of the respective AIF1

signal processing and digital mixing paths. To prevent clipping, 6dB attenuation is applied to the mono

mix.

Digital de-emphasis can be applied to the AIF1 input (playback) paths; this is appropriate when the

data source is a CD where pre-emphasis is used in the recording. De-emphasis filtering is available

for sample rates of 48kHz, 44.1kHz and 32kHz. See

“Digital Filter Characteristics “section for details

of de-emphasis filter characteristics.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1056 (0420h)

AIF1 DAC1

Filters (1)

AIF1DAC1_

MONO

AIF1DAC1 input path (AIF1, Timeslot 0) Mono

Mix Control

0 = Disabled

1 = Enabled

2:1

AIF1DAC1_

DEEMP [1:0]

AIF1DAC1 input path (AIF1, Timeslot 0) De-

Emphasis Control

00 = No de-emphasis

01 = 32kHz sample rate

10 = 44.1kHz sample rate

11 = 48kHz sample rate

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