WM8523 datasheet(31/51 Pages) WOLFSON

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Production Data

WM8523

PD, Rev 4.1, August 2011

MUTE

A digital mute can be applied to left and right channels independently.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

DAC_CTRL3

05h

DACL_

MUTE

Left DAC Mute

0 = Normal operation

1 = Mute

DAC_CTRL3

05h

DACR_

MUTE

Right DAC Mute

0 = Normal operation

1 = Mute

Table 18 DAC Mute Control

The DAC mute function in software mode is controlled by the register settings DAC_VOL_UP_RAMP,

DAC_VOL_DOWN_RAMP and DAC_ZCEN as described in Table 17.

DIGITAL MONOMIX CONTROL

The DAC can be set to output a range of mono and stereo options using DAC_OP_MUX[1:0].

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

AIF_CTRL2

04h

7:6

DAC_OP_

MUX[1:0]

DAC Digital Monomix

00 = Stereo (Normal Operation)

01 = Mono (Left data to DACR)

10 = Mono (Right data to DACL)

11 = Digital Monomix, (L+R)/2

Table 19 Digital Monomix Control

DE-EMPHASIS

A digital de-emphasis filter may be applied to the DAC output when the sampling frequency is 44.1kHz.

Operation at 48kHz and 32kHz is also possible, but with an increase in the error from the ideal response.

Details of the de-emphasis filter characteristic for 32kHz, 44.1kHz and 48kHz can be seen in Figure 31 to

Figure 36.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

AIF_CTRL1

03h

DAC

_DEEMP

DAC De-emphasis

0 = No de-emphasis

1 = Apply de-emphasis

Table 20 De-emphasis Control

ZERO DETECT

The infinite zero detect allows the user to select the number of zero samples received before the ZFLAG

pin is asserted high, as described in Table 21.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

ZERO_DETECT

08h

ZD_

COUNT

Zero Detect Count Control

0 = 1024

1 = 2048

Table 21 Zero Detect Control

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