WM8741GEDS/V Wolfson Microelectronics, WM8741GEDS/V Datasheet - Page 37

• Manufacturer Part Number: WM8741GEDS/V
• Description: Audio D/A Converter ICs Stereo DAC, High End
• Manufacturer: Wolfson Microelectronics

Specifications of WM8741GEDS/V

• Mounting Style: SMD/SMT
• Package / Case: SSOP-28
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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NORMAL PCM MODE DIGITAL FILTER SELECTION
The WM8741 has a number of advanced digital filters that can be selected in all PCM operation
modes (with the exception of 8FS mode).
Table 38 PCM Advanced Digital Filter Selection
Five digital filters are available for selection in each of the three OSR modes (low, medium and high
rate) as selected by the OSR bit described in Table 20. 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. A summary of the filter characteristics is given in Table 39 below:
Table 39 PCM Digital Filter Summary
For full details of the filter characteristics available in normal PCM mode, please see Table 64 to
Table 66 and Figure 28 to Figure 57.
8FS MODE DIGITAL FILTER
In 8FS mode, the majority of the internal filters are bypassed. In this mode, the data is filtered using
only the filter characteristic described by Table 67 and shown in Figure 58 and Figure 59.
DSD PLUS FILTER SELECTION
The WM8741 has a number of compensation filters that can be selected in DSD Plus mode.
Table 40 DSD Plus Digital Filter Selection
REGISTER ADDRESS
Medium
REGISTER ADDRESS
OSR
High
Low
Filter Control
Filter Control
06h
06h
R6
R6
RESPONSE
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
[2:0]
[4:3]
BIT
BIT
DSDFILT
FIRSEL
NOTES
Linear phase half-band filter for backward compatibility
Minimum phase ‘soft-knee’ filter
Minimum phase half-band filter
Linear phase apodising filter
Minimum phase apodising filter
Linear phase ‘soft-knee’ filter
Minimum phase ‘soft-knee’ filter
Linear phase ‘brickwall’ filter
Minimum phase apodising filter
Linear phase apodising filter
Linear phase ‘soft-knee’ filter
Minimum phase ‘soft-knee’ filter
Linear phase ‘brickwall’ filter
Minimum phase apodising filter
Linear phase apodising filter
LABEL
LABEL
[1:0]
DEFAULT
DEFAULT
000
00
Selects FIR1 filter response
000 = Response 1
001 = Response 2
010 = Response 3
011 = Response 4
100 = Response 5
Selects Compensation Filter
response
00 = Response 1
01 = Response 2
10 = Response 3
11 = Response 4
DESCRIPTION
DESCRIPTION
PD, Rev 4.2, October 2009
WM8741
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