XWM8734EDS/RV View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'XWM8734EDS/RV' PDF : 45 Pages View PDF
WM8734
Production Data
FROM DIGITAL
AUDIO
INTERFACE
DIGITAL
DE_EMPHASIS
MUTE
DIGITAL
INTERPOLATION
FILTER
TO LINE
OUTPUTS
DEEMP
DACMU
Figure 12 DAC Filter Schematic
The DAC digital filter can apply digital de-emphasis under software control, as shown in Table 3. The
DAC can also perform a soft mute where the audio data is digitally brought to a mute level. This
removes any abrupt step changes in the audio that might otherwise result in audible clicks in the
audio outputs.
REGISTER
ADDRESS
0000101
Digital Audio
Path Control
BIT
2:1
LABEL
DEEMP[1:0]
DEFAULT
00
3
DACMU
1
Table 3 DAC Software Control
DESCRIPTION
De-emphasis Control
(Digital)
11 = 48kHz
10 = 44.1kHz
01 = 32kHz
00 = Disable
DAC Soft Mute Control
(Digital)
1 = Enable soft mute
0 = Disable soft mute
DAC
The WM8734 employs a multi-bit sigma delta oversampling digital to analogue converter. The
scheme for the converter is illustrated in Figure 13.
FROM DAC
DIGITAL
FILTERS
TO LINE OUTPUT
Figure 13 Multi-Bit Oversampling Sigma Delta Schematic
The DAC converts the multi-level digital audio data stream from the DAC digital filters into high quality
analogue audio.
w
PD, Rev 4.4, August 2013
18
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