WM8590GEDSSLASHV datasheet(25/51 Pages) WOLFSON

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Pre-Production

WM8590

PP Rev 3.3 September 2005

A number of options are available to control how data from the Digital Audio Interface is applied to

the DAC.

MASTER MODES

Control bit ADCMS selects between audio interface Master and Slave Modes for ADC. In ADC

Master mode ADCLRC and ADCBCLK are outputs and are generated by the WM8590. In Slave

mode ADCLRC and ADCBCLK are inputs to WM8590.

BIT

LABEL

DEFAULT

DESCRIPTION

R12 (0Ch)

0001100

Interface Control

ADCMS

Audio Interface Master/Slave Mode

select for ADC:

0 : Slave Mode

1: Master Mode

Control bit DACMS selects between audio interface Master and Slave Modes for the DAC. In DAC

Master mode DACLRC and DACBCLK are outputs and are generated by the WM8590. In Slave

mode DACLRC and DACBCLK are inputs to WM8590.

BIT

LABEL

DEFAULT

DESCRIPTION

R12 (0Ch)

0001100

Interface Control

DACMS

Audio Interface Master/Slave Mode

select for DAC:

0 : Slave Mode

1: Master Mode

MASTER MODE ADCLRC/DACLRC FREQUENCY SELECT

In ADC Master mode the WM8590 generates ADCLRC and ADCBCLK, in DAC master mode the

WM8590 generates DACLRC and DACBCLK. These clocks are derived from the master clock

(ADCMCLK or DACMCLK). The ratios of ADCMCLK to ADCLRC and DACMCLK to DACLRC are

set by ADCRATE and DACRATE respectively.

BIT

LABEL

DEFAULT

DESCRIPTION

2:0

ADCRATE[2:0]

010

Master Mode MCLK:ADCLRC

Ratio Select:

010: 256fs

011: 384fs

100: 512fs

101: 768fs

R12 (0Ch)

0001100

ADCLRC and DACLRC

Frequency Select

6:4

DACRATE[2:0]

010

Master Mode MCLK:DACLRC

Ratio Select:

000: 128fs

001: 192fs

010: 256fs

011: 384fs

100: 512fs

101: 768fs

ADC OVERSAMPLING RATE SELECT

For ADC operation at 96kHz it is recommended that the user set the ADCOSR bit. This changes the

ADC signal processing oversample rate to 64fs. Operation is explained further in Table 5.

BIT

LABEL

DEFAULT

DESCRIPTION

R12 (0Ch)

0001100

ADC Oversampling Rate

ADCOSR

ADC Oversampling Rate Select

0: 128x oversampling

1: 64x oversampling

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