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WM8742GEDS/V Datasheet(PDF) 39 Page - Cirrus Logic

No. de pieza WM8742GEDS/V
Descripción Electrónicos  24-bit 192 kHz DAC with Advanced Digital Filtering
PDF  66 Pages
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Fabricante Electrónico  CIRRUS [Cirrus Logic]
Página de inicio  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8742GEDS/V Datasheet(HTML) 39 Page - Cirrus Logic

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WM8742
Rev 4.4
39
DSD PLUS FILTER SELECTION
The WM8742 has a number of compensation filters that can be selected in DSD Plus mode.
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R6
Filter Control
06h
[4:3]
DSDFILT
[1:0]
00
Selects Compensation Filter
response
00 = Response 1
01 = Response 2
10 = Response 3
11 = Response 4
Table 40 DSD Plus Digital Filter Selection
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:
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R32
Additional Control 1
20h
0
DSD_NO_
NOTCH
0
DSD Direct 8fs Notch Filter
0: Enable 8fs notch filter
1: Disable 8fs notch filter
1
DSD_
LEVEL
1
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.
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R4
Volume Control
04h
7
AMUTE
0
DSD Direct mute control:
0 = mute off
1 = mute on
Table 42 DSD Analogue Mute Control



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