WM9712L datasheet(36/77 Pages) WOLFSON

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WM9712L

Production Data

PD Rev 4.5 August 2006

SPEAKER MIXER

The speaker mixer drives the LOUT2 and ROUT2 output. The following signals can be mixed into the

speaker path:

•

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

•

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

•

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

•

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 speaker signal is a mix of AUXDAC (for system alerts or ring

tone playback), PHONE (for speakerphone function), and PC_BEEP (for externally generated ring

tones).

MONO MIXER

The mono mixer drives the MONOOUT pin. The following signals can be mixed into MONOOUT:

•

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 10h, 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 MONOOUT signal is a mix of the amplified microphone

signal (possibly with Automatic Gain Control) and (if enabled) an audio playback signal from the

stereo DAC or the auxiliary DAC.

SIDE TONE CONTROL

The side tone path is into the headphone mixer and is either from the MIC or ALC path (with no 20dB

boost)

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

STM

MIC side tone select

0: selected

1 : not selected (path muted)

14:12

STVOL

010

(0dB)

MIC Sidetone volume

000 : +6dB (max.)

001: +3dB

… (3dB steps)

111 : -15dB (min.)

11:10

ALCM

ALC side tone select

11: mute

10: mono – left

01: mono – right

00: stereo

14h

Sidetone

Control

9:7

ALCVOL

010

(0dB)

ALC Sidetone volume

Similar to STVOL

Table 23 Side Tone Control

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