WM8351 datasheet(73/330 Pages) WOLFSON

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Production Data

WM8351

PD, April 2012, Rev 4.5

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

Left Digital Side tone Volume in dB

(See Table 30 for volume range)

7:4

ADCR_DAC_SVOL

[3:0]

0000

Right Digital Side tone Volume in dB

(See Table 30 for volume range)

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.

ADCL_DAC_SVOL or

ADCR_DAC_SVOL

SIDETONE

VOLUME

0000

-36

0001

-33

0010

-30

0011

-27

0100

-24

0101

-21

0110

-18

0111

-15

1000

-12

1001

-9

1010

-6

1011

-3

1100

1101

1110

1111

Table 30 Digital Side Tone Control

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