WM1811A datasheet(85/328 Pages) WOLFSON

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Production Data

WM1811A

PD, November 2013, Rev 4.1

DIGITAL VOLUME AND FILTER CONTROL

This section describes the digital volume and filter controls of the WM1811A AIF paths.

Digital volume control and High Pass Filter (HPF) control is provided on the AIF1 and 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, soft-mute and mono mix control is provided on the AIF1 and AIF2 input (digital

playback) paths.A configurable noise gate function is available on each of the digital playback paths.

AIF1 - OUTPUT PATH VOLUME CONTROL

A digital volume control is provided on the AIF1 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 bits control the loading of digital volume control data. When this bit is set to 0, the

AIF1ADC1L_VOL and AIF1ADC1R_VOL control data will be loaded into the respective control

The AIF1ADC1L_VOL and AIF1ADC1R_VOL gain settings are updated when a 1 is written to

AIF1ADC1_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

AIF1ADC output path 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)

AIF1ADC (Left) output path Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

EFh = +17.625dB

(See Table 36 for volume range)

R1025

(0401h)

AIF1 ADC1

Right Volume

AIF1ADC1_

N/A

AIF1ADC output path 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)

AIF1ADC (Right) output path Digital Volume

00h = MUTE

01h = -71.625dB

… (0.375dB steps)

EFh = +17.625dB

(See Table 36 for volume range)

Table 35 AIF1 Output Path Volume Control

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