WM8993 datasheet(48/229 Pages) WOLFSON

48 / 229 page

WM8993

Production Data

PD, November 2010, Rev 4.0

DIGITAL MIXING

The ADC and DAC data can be combined in various ways to support a range of different usage

modes.

Data from either of the two ADCs can be routed to either the left or the right channel of the digital

audio interface. In addition, data from either of the digital audio interface channels can be routed to

either the left or the right DAC. See "Digital Audio Interface" for more information on the audio

interface.

The WM8993 provides a Dynamic Range Control (DRC) feature, which can apply compression and

gain adjustment in the digital domain to either the ADC or DAC signal path. This is effective in

controlling signal levels under conditions where input amplitude is unknown or varies over a wide

range.

The DACs can be configured as a mono mix of the two audio channels. Digital sidetone from the

ADCs can also be selectively mixed into the DAC output path.

DIGITAL MIXING PATHS

Figure 14 shows the digital mixing paths available in the WM8993 digital core.

DAC L

DAC R

ADC L

ADC R

Parametric

Equalizer

L R

R L

L/R SWAP

Dynamic Range

Controller

Dynamic Range Control

(DRC) available on ADC

or DAC channels, not both.

Dynamic Range

Controller

DIGITAL AUDIO

INTERFACE

A-law and -law Support

TDM Support

MONO MIX

L R

R L

AIFADCL_SRC

AIFADCR_SRC

ADCL_DATINV

ADCR_DATINV

AIFDACL_SRC

AIFDACR_SRC

DACL_DATINV

DACR_DATINV

DAC_VU

DACL_VOL[7:0]

DACR_VOL[7:0]

DAC_MUTE

DAC_BOOST[1:0]

DAC_MUTERATE

DAC_UNMUTE_RAMP

ADC_VU

ADCL_VOL[7:0]

ADCR_VOL[7:0]

ADCL_ENA

ADCR_ENA

DACL_ENA

DACR_ENA

DEEMPH[1:0]

DAC_COMP

DAC_COMPMODE

ADC_COMP

ADC_COMPMODE

AIFDAC_TDM

AIFDAC_TDM_CHAN

AIFADC_TDM

AIFADC_TDM_CHAN

AIF_WL[1:0]

AIF_FMT[1:0]

LOOPBACK

ADC_HPF

ADC_HPF_CUT[1:0]

ADCL_DAC_SVOL[3:0]

ADCR_DAC_SVOL[3:0]

DAC_SB_FILT

DAC_MONO

ADC_TO_DACL[1:0]

ADC_TO_DACR[1:0]

Figure 14 Digital Mixing Paths

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