WM8741GEDSSLASHRV datasheet(38/64 Pages) WOLFSON

38 / 64 page

WM8741

Production Data

PD, Rev 4.2, October 2009

It is recommended that the device is muted before the filter response is changed to prevent noise as

the filters are reset from appearing on the outputs.

Full details of these filters are described in Table 68 and Figure 60 to Figure 67.

DSD DIRECT DIGITAL FILTERS

The DSD Direct filters have been designed to provide the minimal of processing to the data with no

decimation, re-quantisation or noise-shaping, in order to preserve the signal integrity as much as

possible. As a result the filters have a wide bandwidth and a very gradual attenuation. It is

recommended that whichever DSD Direct filter is chosen it is augmented by analogue post-DAC

filtering in order to adhere to the Scarlet-Book SACD standard.

There are a total of four DSD Direct filter responses available, controlled by two register bits as

described in Table 41 below:

BIT

LABEL

DEFAULT

DESCRIPTION

R32

Additional Control 1

20h

DSD_NO_

NOTCH

DSD Direct 8fs Notch Filter

0: Enable 8fs notch filter

1: Disable 8fs notch filter

DSD_

LEVEL

DSD Direct Filter Gain

0: High gain

1: Low gain

Table 41 DSD Direct Digital Filter Selection

DSD MUTE CONTROL

In DSD Direct mode, an analogue mute can be applied at the output of the DAC. This is controlled

by register bit AMUTE.

BIT

LABEL

DEFAULT

DESCRIPTION

Volume Control

04h

AMUTE

DSD Direct mute control:

0 = mute off

1 = mute on

Table 42 DSD Analogue Mute Control

POWER SAVING STANDBY CONTROL

Setting the PWDN register bit immediately connects all outputs to VMID and resets the digital sections

of the DAC system including the DLL, the audio interface and the DSP. Input data samples are not

preserved, but all control register settings are maintained. When PWDN is cleared the WM8741 will

repeat its power-on initialisation sequence.

BIT

LABEL

DEFAULT

DESCRIPTION

Format Control

05h

PWDN

Power Down Mode Select:

0 = Normal Mode

1 = Power Down Mode

Table 43 Powerdown Control

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