WM9712CLGEFLSLASHV datasheet(25/78 Pages) WOLFSON

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Production Data

WM9712L

PD, Rev 4.6, November 2011

AUDIO DACS

STEREO DAC

The WM9712L has a stereo sigma-delta DAC that achieves high quality audio playback at low power

consumption. Digital tone control, adaptive bass boost and 3-D enhancement functions operate on

the digital audio data before it is passed to the stereo DAC. (Contrary to the AC’97 specification, they

have no effect on analogue input signals or signals played through the auxiliary DAC. Nevertheless,

the ID2 and ID5 bits in the reset register, 00h, are set to ‘1’ to indicate that the WM9712L supports

tone control and bass boost.)

The DAC output has a PGA for volume control. The DAC sample rate can be controlled by writing to a

control register (see “Variable Rate Audio”). It is independent of the ADC sample rate. The left and

right DACs can be separately powered down using the PD13 and PD14 control bits, whereas the PR1

bit disables both DACs (see “Power Management” section).

STEREO DAC VOLUME

The volume of the DAC output signal is controlled by a PGA (Programmable Gain Amplifier). It can be

mixed into the headphone, speaker and phone output paths (see “Audio Mixers”).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

18h

DAC

Volume

D2H

Mute DAC path to headphone mixer

1: Mute, 0: No mute (ON)

D2S

Mute DAC path to speaker mixer

1: Mute, 0: No mute (ON)

D2P

Mute DAC path to phone mixer

1: Mute, 0: No mute (ON)

12:8

DACL

VOL

01000

(0dB)

Left DAC Volume

00000: +12dB

… (1.5dB steps)

11111: -34.5dB

4:0

DACR

VOL

01000

(0dB)

Right DAC Volume

similar to DACLVOL

5Ch

Additional

Functions

(1)

AMUTE

Read-only bit to indicate auto-muting

1: DAC auto-muted

0: DAC not muted

AMEN

DAC Auto-Mute Enable

1: Automatically mutes analogue output of

stereo DAC if digital input is zero

0: Auto-mute OFF

Table 11 Stereo DAC Volume Control

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