WM8581 datasheet(33/94 Pages) WOLFSON

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WM8581

PP Rev 1.0 March 2006

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

7:0

RDA4[7:0]

11111111

(0dB)

Digital Attenuation control for DAC4 Left Channel (DACL4) in 0.5dB

steps. See Table 22.

R26

DIGITAL

ATTENUATION

DACL4

1Ah

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0 = Store LDA4 in intermediate latch (no change to output)

1 = Apply LDA4 and update attenuation on all channels.

7:0

MASTDA[7:0]

11111111

(0dB)

Digital Attenuation control for DAC4 Right Channel (DACR4) in

0.5dB steps. See Table 22

R27

DIGITAL

ATTENUATION

DACR4

1Bh

UPDATE

Not latched

ontrols simultaneous update of all Attenuation Latches

0 = Store RDA4 in intermediate latch (no change to output)

1 = Apply RDA4 and update attenuation on all channels.

7:0

MASTDA[7:0]

11111111

(0dB)

Digital Attenuation control for all DAC channels in 0.5dB steps. See

Table 22

R28

MASTER

DIGITAL

ATTENUATION

1Ch

UPDATE

Not latched

Controls simultaneous update of all Attenuation Latches

0 = Store gain in intermediate latch (no change to output)

1 = Apply gain and update attenuation on all channels.

Table 21 Digital Attenuation Registers

Note: The volume update circuit of the WM8581 has two sets of registers; LDAx and RDAx. These

can be accessed individually, or simultaneously by writing to MASTDA - Master Digital

Attenuation. Writing to MASTDA will overwrite the contents of LDAx and RDAx.

L/RDAx[7:0]

ATTENUATION LEVEL

00(hex)

∞ dB (mute)

01(hex)

-127.5dB

FE(hex)

-0.5dB

FF(hex)

0dB

Table 22 Digital Volume Control Gain Levels

Setting the DACATC register bit causes the left channel attenuation settings to be applied to both left

and right channel DACs from the next audio input sample. No update to the attenuation registers is

required for DACATC to take effect.

BIT

LABEL

DEFAULT

DESCRIPTION

R19

DAC CONTROL 5

13h

DACATC

Attenuator Control

0 = All DACs use attenuations as

programmed.

1 = Right channel DACs use

corresponding left DAC

attenuations

Table 23 DAC Attenuation Register

The digital volume control also incorporates a zero cross detect circuit which detects a transition

through the zero point before updating the digital volume control with the new volume. This

mechanism helps prevents pops and clicks during volume transitions, and is enabled by control bit

DZCEN.

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