WM8991 datasheet(57/174 Pages) WOLFSON

57 / 174 page

Pre-Production

WM8991

PP, May 2008, Rev 3.1

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.

DIGITAL MIXING PATHS

Figure 28 shows the digital mixing paths available in the WM8991 digital core.

GPIO

Alternative DAC Interface

Alternative MCLK

Button Control / Accessory Detect

Clock Output

Inverted ADCLRC

ADCR_ENA

HIGH

PASS

FILTER

(VOICE

OR HI-FI)

HIGH

PASS

FILTER

(VOICE

OR HI-FI)

DAC

ADC

MONO

DAC_BOOST

[1:0]

ADCL_DATINV

ADC_HPF_CUT

[1:0]

ADCL_VOL

[7:0]

ADCR_VOL

[7:0]

DACL_VOL

[7:0]

DACR_VOL

[7:0]

ADC_TO_DACL

[1:0]

ADC_TO_DACR

[1:0]

DAC_MONO

DAC_MUTE,

DAC_MUTEMODE,

DAC_MUTERATE,

DAC_SB_FILT,

DEEMP[1:0]

DACL

DACR

DAC_BOOST

00 = 0dB

01 = +6dB

10 = +12dB

11 = +18dB

00=0

01=ADCL

10=ADCR

11=Reserved

DIGITAL AUDIO

INTERFACE

A-law and u-law support

TDM Support

ADC_HPF_ENA

ADCL_DAC_SVOL

[7:0]

ADCR_DAC_SVOL

[7:0]

ADCR_DATINV

DACR_DATINV

DACL_DATINV

AIFADCL_SRC

AIFADCR_SRC

DACR_SRC

DACL_SRC

ADCL_ENA

DIGITAL CORE

READBACK AVAILABLE

MAIN REGISTER BIT REFERENCE

ELSEWHERE IN DIAGRAM

Figure 28 Digital Mixing Paths

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