WM1811A datasheet(93/328 Pages) WOLFSON

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Production Data

WM1811A

PD, November 2013, Rev 4.1

AIF2 - INPUT PATH VOLUME CONTROL

A digital volume control is provided on the AIF2 input signal paths, allowing attenuation in the range -

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

The AIF2DAC_VU bits control the loading of digital volume control data. When this bit is set to 0, the

AIF2DACL_VOL and AIF2DACR_VOL control data will be loaded into the respective control register,

but will not actually change the digital gain setting.

The AIF2DACL_VOL and AIF2DACR_VOL gain settings are updated when a 1 is written to

AIF2DAC_VU. This makes it possible to update the gain of left and right channels simultaneously.

Note that a digital gain function is also available at the audio interface input, to boost the DAC volume

when a small signal is received on DACDAT2. See “Digital Audio Interface Control” for further details.

Digital volume control is also possible within the digital core functions, after the audio signal has

passed through the DAC output digital mixers or AIF2 output digital mixers. See “Digital Mixing” for

further details.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R1282

(0502h)

AIF2 DAC

Left Volume

AIF2DAC_V

N/A

AIF2DAC input path Volume Update

Writing a 1 to this bit will cause the AIF2DACL

and AIF2DACR volume to be updated

simultaneously

7:0

AIF2DACL_

VOL [7:0]

C0h

(0dB)

AIF2DAC (Left) input path Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

C0h = 0dB

FFh = 0dB

(See Table 40 for volume range)

R1283

(0503h)

AIF2 DAC

Right Volume

AIF2DAC_V

N/A

AIF2DAC input path Volume Update

Writing a 1 to this bit will cause the AIF2DACL

and AIF2DACR volume to be updated

simultaneously

7:0

AIF2DACR_

VOL [7:0]

C0h

(0dB)

AIF2DAC (Right) input path Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

C0h = 0dB

FFh = 0dB

(See Table 40 for volume range)

Table 46 AIF2 Input Path Volume Control

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