WM1811A datasheet(64/328 Pages) WOLFSON

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WM1811A

Production Data

PD, November 2013, Rev 4.1

DIGITAL VOLUME (DAC AND AIF2 OUTPUT PATHS)

The volume level of each DAC output mixer path and each AIF2 output mixer path can be controlled

digitally over a range from -71.625dB to +12dBin 0.375dB steps. The level of attenuation for an eight-

bit code X is given by:

0.375

 (X-192) dB for 1  X 224;

MUTE for X = 0;

12dB to 224

 X  255

Each of the digital output mixer paths can be muted using the soft mute control bits described inTable

21. The WM1811A always applies a soft mute, where the volume is decreased gradually. The un-

mute behaviour is configurable, as described in the “Digital Volume Soft Mute and Soft Un-Mute”

section.

The DAC1_VU and AIF2TX_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 register, but will not actually change the digital gain setting. Both left and right gain settings are

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 AIF2TXL and AIF2TXR is controlled by the AIF2TX_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

… (0.375dB steps)

E0h = 12dB

FFh = 12dB

(See Table 22for 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

… (0.375dB steps)

E0h = 12dB

FFh = 12dB

(See Table 22for volume range)

R1554 (0612h)

AIF2TX Left

Volume

AIF2TXL_M

UTE

AIF2 Tx (Left) Soft Mute Control

0 = Un-mute

1 = Mute

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