WM8994 datasheet(97/359 Pages) WOLFSON

97 / 359 page

Production Data

WM8994

PD, April 2012, Rev 4.4

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

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

R1058 (0422h)

AIF1 DAC2

Filters (1)

AIF1DAC2_

MONO

AIF1DAC2 input path (AIF1, Timeslot 1) Mono

Mix Control

0 = Disabled

1 = Enabled

2:1

AIF1DAC2_

DEEMP [1:0]

AIF1DAC2 input path (AIF1, Timeslot 1) De-

Emphasis Control

00 = No de-emphasis

01 = 32kHz sample rate

10 = 44.1kHz sample rate

11 = 48kHz sample rate

Table 41 AIF1 Input Path Mono Mix and De-Emphasis Filter Control

AIF2 - OUTPUT PATH VOLUME CONTROL

The AIF2 interface supports two output channels. A digital volume control is provided on each output

signal path, allowing attenuation in the range -71.625dB to +17.625dB in 0.375dB steps. The level of

attenuation for an eight-bit code X is given by:

0.375

 (X-192) dB for 1  X  239;

MUTE for X = 0

+17.625dB for 239

 X  255

The AIF2ADC_VU bit controls the loading of digital volume control data. When AIF2ADC_VU bit is set

to 0, the AIF2ADCL_VOL and AIF2ADCR_VOL control data will be loaded into the respective control

updated when a 1 is written to AIF2ADC_VU. This makes it possible to update the gain of left and

right channels simultaneously.

WM8994 Datasheet(PDF) 97 Page - Wolfson Microelectronics plc

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