WM9713 datasheet(35/111 Pages) WOLFSON

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Preliminary Technical Data

WM9713L

PTD, March 2004, Rev 2.2

AUDIO DACS

STEREO DAC

The WM9713L 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 WM9713L 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.

When not in use the DACs can be separately powered down using the Powerdown register bits

DACL and DACR (register 3Ch, bits [7:6]).

STEREO DAC VOLUME

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

DAC can be mixed into the headphone, speaker and mono mixer paths (see “Audio Mixers”)

controlled by register 0Ch.

Each DAC-to-mixer path has an independent mute bit. When all DAC-to-mixer paths are muted the

DAC PGA is muted automatically.

When not in use the DAC PGAs can be powered down using the Powerdown register bits DACL and

DACR (register 3Ch, bits [7:6]).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

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)

D2M

Mute DAC path to mono mixer

1: Mute, 0: No mute (ON)

12:8

DACL

VOL

01000

(0dB)

Left DAC Volume

00000: +12dB

… (1.5dB steps)

11111: -34.5dB

0Ch

DAC

Volume

4:0

DACR

VOL

01000

(0dB)

Right DAC Volume

similar to DACLVOL

AMUTE

Read-only bit to indicate auto-muting

1: DAC auto-muted

0: DAC not muted

5Ch

Additional

Functions

(2)

AMEN

DAC Auto-Mute Enable

1: Automatically mutes analogue output of

stereo DAC if digital input is zero

0: Auto-mute OFF

Table 15 Stereo DAC Volume Control

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