WM8741 datasheet(31/63 Pages) WOLFSON

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WM8741

PP Rev 1.3 October 2007

MCLK/LRCLK RATIO CONTROL (NORMAL PCM MODE)

The ratio of MCLK/LRCLK can be programmed directly or auto-detected.

BIT

LABEL

DEFAULT

DESCRIPTION

Mode Control 1

07h

[4:2]

SR[3:0]

000

MCLK to LRCLK sampling rate ratio

control (Normal PCM Mode):

000 = auto detect sample rate

001 = 128fs

010 = 192fs

011 = 256fs

100 = 384fs

101 = 512fs

110 = 768fs

111 = reserved

Table 21 MCLK/LRCLK Ratio Control (Normal PCM Mode)

8FS MODE

8FS Mode allows the use of custom digital filters by bypassing the WM8741 internal digital filters.

When MODE8X is set, the PCM data input to the WM8741 is applied only to the digital volume

control and then the analogue section of the DAC system, bypassing the digital filters.

BIT

LABEL

DEFAULT

DESCRIPTION

Format Control

07h

MODE8X

8FS mode select:

0 = Normal operation

1 = 8FS mode (digital filters

bypassed)

Table 22 8FS Mode Control

MCLK/LRCLK RATIO CONTROL (8FS MODE)

In 8FS mode the choice of clock ratios and sampling rates is limited – see Table 12 for details.

Autodetect of MCLK/LRCLK ratio is not available in 8FS mode and must be set manually by the user

for correct operation.

BIT

LABEL

DEFAULT

DESCRIPTION

Mode Control 1

07h

[4:2]

SR[2:0]

000

MCLK to LRCLK sampling rate ratio

control (8FS Mode):

000 = reserved

001 = 512fs

010 = 768fs

011 to 111 = reserved

Table 23 MCLK/LRCLK Ratio Control (8FS Mode)

ATTENUATION CONTROL

Each DAC channel can be attenuated digitally before being applied to the digital filter. Attenuation is

set to 0dB by default but can be set between 0dB and -127.5dB in 0.125dB steps using the ten

attenuation control bits LAT[4:0], LAT[9:5], RAT[4:0] and RAT[9:5].

All attenuation registers are double latched allowing new values to be pre-latched to both channels

before being updated synchronously. Setting the UPDATE bit on any attenuation write will cause all

pre-latched values to be immediately applied to the DAC channels.

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