WM8533 datasheet(28/41 Pages) WOLFSON

28 / 41 page

WM8533

Production Data

PD, July 2012, Rev 4.0

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

R4 (04h)

AIF_CTRL2

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 29 to Figure 34.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3 (03h)

AIF_CTRL1

DAC_DEE

DAC De-emphasis

0 = No de-emphasis

1 = Apply de-emphasis

Table 20 De-emphasis Control

HARDWARE CONTROL INTERFACE

The WM8533 can be controlled in hardware mode or in software modes. In hardware mode, the

device is configured according to logic levels applied to hardware pins.

Hardware control mode is selected by leaving CIFMODE pin open-circuit (high-impedance). When

hardware mode is selected, the associated multi-function control pins are defined as described in

Table 21.

PIN NAME

DESCRIPTION

AIFMODE0 /

AIFMODE1

AIFMODE0

FORMAT

24-bit Left Justified

24-bit I

16-bit Right Justified

24-bit Right Justified

MUTE

¯¯¯¯¯

Mute Control

0 = Mute

1 = Normal operation

CIFMODE

Control Interface Mode

0 = I

2C Mode

1 = SPI Mode

Z = Hardware Mode

Table 21 Hardware Control Pin Configuration

MUTE

In hardware mode, the MUTE

¯¯¯¯¯ pin controls the DAC mute to both left and right channels. When the

mute is asserted a softmute is applied to ramp the signal down, with the ramp rate related to the

sample rate as defined in Table 15 on page 26. When the mute is de-asserted the DAC output

returns to normal in one step.

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