WM9712CLGEFLSLASHV datasheet(35/78 Pages) WOLFSON

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Production Data

WM9712L

PD, Rev 4.6, November 2011

AUDIO MIXERS

MIXER OVERVIEW

The WM9712L has three separate low-power audio mixers to cover all audio functions required by

smartphones, PDAs and handheld computers. The diagram below shows the routing of the analogue

audio signals into the mixers. The numbers at the mixer inputs refer to the control register bits that

control the volume and muting for that particular signal.

PHONE_IN

PCBEEP

LINE_IN

Stereo

headphone /

headset

HPOUTL

HPOUTR

HPVOL

(Reg 04h)

MONOOUT

(PHONE TX)

OUT3VOL

(Reg 16h)

LOUT2

ROUT2

OUT2VOL

(Reg 02h)

loud

speaker

OUT3

ear

speaker

0Ch [4:0]

10h [12:8,4:0]

18h [12:8,4:0]

RECORD

SELECT

0Eh [12:8,4:0]

MICR

MICL

DIFF /

STEREO/

MONO

(Reg 20h)

STEREO

DAC

AUX

DAC

(12-BIT)

1Ch / ALC

0/20

0Eh [7]

MONOOUT

VREF

18h [15]

10h [15]

14h [15:12]

14h [11:7]

0Ch [15]

12h [15:12]

18h [13]

10h [13]

0Eh [14,13]

1Ah [13:11]

0Ah [15:12]

HEAD

PHONE/

EAR

SPEAKER

MIX

PHONE

MIX

12h [7:4]

0Ah [7:4]

-1

12h [11:8]

18h [14]

10h [14]

0Ah [11:8]

0Ch [14]

BACK

SPEAKER

MIX

SRC

(Reg 16h)

OUT3SRC

(Reg 16h)

STEREO

ADC

PHONE MIX

HEADPHONE MIX

BACK SPKR MIX

INV

(Reg 02h)

1Ah [14]

0/20

Figure 4 Audio Mixer Overview

HEADPHONE MIXER

The headphone mixer drives the HPOUTL and HPOUTR outputs. It also drives OUT3, if this pin is

connected to an ear speaker (phone receiver). The following signals can be mixed into the

headphone path:



PHONE (controlled by register 0Ch, see “Audio Inputs”)



LINE_IN (controlled by register 10h, see “Audio Inputs”)



the output of the Record PGA (see “Audio ADC”, “Record Gain”)



the stereo DAC signal (controlled by register 18h, see “Audio DACs”)



the MIC signal (controlled by register 0Eh, see “Audio Inputs”)



PC_BEEP (controlled by register 0Ah, see “Audio Inputs”)



the AUXDAC signal (controlled by register 12h, see “Auxiliary DAC”)

In a typical smartphone application, the headphone signal is a mix of PHONE and sidetone (for phone

calls) and the stereo DAC signal (for music playback).

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