WM8994ECSSLASHR datasheet(92/363 Pages) CIRRUS

92 / 363 page

WM8994

Rev 4.6

DIGITAL VOLUME AND FILTER CONTROL

This section describes the digital volume and filter controls of the WM8994 AIF paths.

Digital volume control and High Pass Filter (HPF) control is provided on four AIF1 output (digital

record) paths and two AIF2 output (digital record) paths.

Note that, when ultrasonic (4FS) mode is selected on AIF1, then the digital volume control and high

pass filter (HPF) control are bypassed on the respective ADC (output) signal paths.

Digital volume control, soft-mute control, mono mix and de-emphasis filter control is provided on four

AIF1 input (digital playback) paths and two AIF2 input (digital playback) paths.

AIF1 - OUTPUT PATH VOLUME CONTROL

The AIF1 interface supports up to four output channels. A digital volume control is provided on each of

these output signal paths, 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 AIF1ADC1_VU and AIF1ADC2_VU bits control the loading of digital volume control data. When

the volume update bit is set to 0, the associated volume control data will be loaded into the respective

control register, but will not actually change the digital gain setting.

The AIF1ADC1L and AIF1ADC1R gain settings are updated when a 1 is written to AIF1ADC1_VU.

The AIF1ADC2L and AIF1ADC2R gain settings are updated when a 1 is written to AIF1ADC2_VU.

This makes it possible to update the gain of left and right channels simultaneously.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1024

(0400h)

AIF1 ADC1

Left Volume

AIF1ADC1_

N/A

AIF1ADC1 output path (AIF1, Timeslot 0)

Volume Update

Writing a 1 to this bit will cause the

AIF1ADC1L and AIF1ADC1R volume to be

updated simultaneously

7:0

AIF1ADC1L

_VOL [7:0]

C0h

(0dB)

AIF1ADC1 (Left) output path (AIF1, Timeslot

0) Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

EFh = +17.625dB

(See Table 35 for volume range)

R1025

(0401h)

AIF1 ADC1

Right Volume

AIF1ADC1_

N/A

AIF1ADC1 output path (AIF1, Timeslot 0)

Volume Update

Writing a 1 to this bit will cause the

AIF1ADC1L and AIF1ADC1R volume to be

updated simultaneously

7:0

AIF1ADC1R

_VOL [7:0]

C0h

(0dB)

AIF1ADC1 (Right) output path (AIF1, Timeslot

0) Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

EFh = +17.625dB

(See Table 35 for volume range)

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