WM8352 datasheet(73/336 Pages) WOLFSON

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Production Data

WM8352

PD, February 2011, Rev 4.4

13.6 DIGITAL MIXING

13.6.1

DIGITAL SIDETONE

A digital sidetone is available when ADCs and DACs are operating at the same sample rate. Digital

data from either left or right ADC can be mixed with the audio interface data on the left and right DAC

channels. Sidetone data is taken from the ADC high pass filter output, to reduce low frequency noise

in the sidetone (e.g. wind noise or mechanical vibration).

The digital sidetone will not function when ADCs and DACs are operating at different sample rates.

When using the digital sidetone, it is recommended that the ADCs are enabled before un-muting the

DACs to prevent pop noise. The DAC volumes and sidetone volumes should be set to an appropriate

level to avoid clipping at the DAC input.

The digital sidetone is controlled as shown Table 29.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R68 (44h)

ADC

Divider

11:8

ADCL_DAC_SVOL

[3:0]

0000

Controls left digital side tone volume

from -36dB to 0dB in 3dB steps.

0000 = -36dB

0001 = -33dB

… (3dB steps)

1011 = -3dB

1100 = 0dB

11XX = 0dB

7:4

ADCR_DAC_SVOL

[3:0]

0000

Controls right digital side tone

volume from -36dB to 0dB in 3dB

steps.

0000 = -36dB

0001 = -33dB

… (3dB steps)

1011 = -3dB

1100 = 0dB

11XX = 0dB

R60 (3Ch)

Digital Side

Tone

Control

13:12

ADC_TO_DACL

[1:0]

DAC Left Side-tone Control

11 = Unused

10 = Mix ADCR into DACL

01 = Mix ADCL into DACL

00 = No Side-tone mix into DACL

11:10

ADC_TO_DACR

[1:0]

DAC Right Side-tone Control

11 = Unused

10 = Mix ADCR into DACR

01 = Mix ADCL into DACR

00 = No Side-tone mix into DACR

Table 29 Digital Side Tone Control

The coding of ADCL_DAC_SVOL and ADCR_DAC_SVOL is described in Table 30.

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