WM8994ECSSLASHR datasheet(101/363 Pages) CIRRUS

101 / 363 page

WM8994

Rev 4.6

101

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

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.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1280

(0500h)

AIF2 ADC

Left Volume

AIF2ADC_V

N/A

AIF2ADC output path Volume Update

Writing a 1 to this bit will cause the AIF2ADCL

and AIF2ADCR volume to be updated

simultaneously

7:0

AIF2ADCL_

VOL [7:0]

C0h

(0dB)

AIF2ADC (Left) output path Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

EFh = +17.625dB

(See Table 35 for volume range)

R1281

(0501h)

AIF2 ADC

Right Volume

AIF2ADC_V

N/A

AIF2ADC output path Volume Update

Writing a 1 to this bit will cause the AIF2ADCL

and AIF2ADCR volume to be updated

simultaneously

7:0

AIF2ADCR_

VOL [7:0]

C0h

(0dB)

AIF2ADC (Right) output path Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

EFh = +17.625dB

(See Table 35 for volume range)

Table 42 AIF2 Output Path Volume Control

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