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WM8974 датащи(PDF) 21 Page - Cirrus Logic

номер детали WM8974
подробное описание детали  Mono CODEC with Speaker Driver
PDF  89 Pages
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производитель  CIRRUS [Cirrus Logic]
домашняя страница  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8974 датащи(HTML) 21 Page - Cirrus Logic

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WM8974
Rev 4.7
21
HPFCUT
FS (KHZ)
SR=101/100
SR=011/010
SR=001/000
8
11.025
12
16
22.05
24
32
44.1
48
000
82
113
122
82
113
122
82
113
122
001
102
141
153
102
141
153
102
141
153
010
131
180
196
131
180
196
131
180
196
011
163
225
245
163
225
245
163
225
245
100
204
281
306
204
281
306
204
281
306
101
261
360
392
261
360
392
261
360
392
110
327
450
490
327
450
490
327
450
490
111
408
563
612
408
563
612
408
563
612
Table 11 High-Pass Filter Cut-off Frequencies (HPFAPP=1)
Note that the High-Pass filter values (when HPFAPP=1) work on the basis that the SR register bits
are set correctly for the actual sample rate as shown in Table 11.
PROGRAMMABLE NOTCH FILTER
A programmable notch filter is provided. This filter has a variable centre frequency and bandwidth,
programmable via two coefficients, a0 and a1.
These coefficients should be converted to 2’s
complement numbers to determine the register values. a0 and a1 are represented by the register bits
NFA0[13:0] and NFA1[13:0]. Because these coefficient values require four register writes to setup
there is an NFU (Notch Filter Update) flag which should be set only when all four registers are setup.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R27
Notch Filter 1
6:0
NFA0[13:7]
0
Notch Filter a0 coefficient, bits [13:7]
7
NFEN
0
Notch filter enable:
0=Disabled
1=Enabled
8
NFU
0
Notch filter update. The notch filter values
used internally only update when one of
the NFU bits is set high.
R28
Notch Filter 2
6:0
NFA0[6:0]
0
Notch Filter a0 coefficient, bits [6:0]
8
NFU]
0
Notch filter update. The notch filter values
used internally only update when one of
the NFU bits is set high.
R29
Notch Filter 3
6:0
NFA1[13:7]
0
Notch Filter a1 coefficient, bits [13:7]
8
NFU
0
Notch filter update. The notch filter values
used internally only update when one of
the NFU bits is set high.
R30
Notch Filter 4
6:0
NFA1[6:0]
0
Notch Filter a1 coefficient, bits [6:0]
8
NFU
0
Notch filter update. The notch filter values
used internally only update when one of
the NFU bits is set high.
Table 12 Notch Filter Function



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