WM8994ECSSLASHR datasheet(107/363 Pages) CIRRUS

107 / 363 page

WM8994

Rev 4.6

107

DAC DIGITAL VOLUME

The output level of each DAC can be controlled digitally over a range from -71.625dB to 0dB 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  192;

MUTE for X = 0;

0dB for 192

 X  255

Each of the DACs can be muted using the soft mute control bits described in Table 50. The WM8994

always applies a soft mute, where the volume is decreased gradually. The un-mute behaviour is

configurable, as described in the “DAC Soft Mute and Soft Un-Mute” section.

The DAC1_VU and DAC2_VU bits control the loading of digital volume control data. When DAC1_VU

is set to 0, the DAC1L_VOL or DAC1R_VOL control data will be loaded into the respective control

updated when a 1 is written to DAC1_VU. This makes it possible to update the gain of both channels

simultaneously. A similar function for DAC2L and DAC2R is controlled by the DAC2_VU register bit.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1552 (0610h)

DAC1 Left

Volume

DAC1L_MU

DAC1L Soft Mute Control

0 = DAC Un-mute

1 = DAC Mute

DAC1_VU

N/A

DAC1L and DAC1R Volume Update

Writing a 1 to this bit will cause the

DAC1L and DAC1R volume to be

updated simultaneously

7:0

DAC1L_VO

L [7:0]

C0h

(0dB)

DAC1L Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

C0h = 0dB

FFh = 0dB

(See Table 51 for volume range)

R1553 (0611h)

DAC1 Right

Volume

DAC1R_MU

DAC1R Soft Mute Control

0 = DAC Un-mute

1 = DAC Mute

DAC1_VU

N/A

DAC1L and DAC1R Volume Update

Writing a 1 to this bit will cause the

DAC1L and DAC1R volume to be

updated simultaneously

7:0

DAC1R_VO

L [7:0]

C0h

(0dB)

DAC1R Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

C0h = 0dB

FFh = 0dB

(See Table 51 for volume range)

WM8994ECS/R Datenblatt(PDF) 107 Page - Cirrus Logic

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