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WM8980CGEFL/V データシート(PDF) 32 Page - Wolfson Microelectronics plc

部品番号 WM8980CGEFL/V
部品情報  Stereo CODEC with Speaker Driver and Video Buffer
PDF  123 Pages
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メーカー  WOLFSON [Wolfson Microelectronics plc]
ホームページ  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8980CGEFL/V データシート(HTML) 32 Page - Wolfson Microelectronics plc

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WM8980
Pre-Production
w
PP, Rev 3.8, May 2012
32
SELECTABLE HIGH PASS FILTER
A selectable high pass filter is provided. To disable this filter set HPFEN=0. The filter has two
modes controlled by HPFAPP. In Audio Mode (HPFAPP=0) the filter is first order, with a cut-off
frequency of 3.7Hz. In Application Mode (HPFAPP=1) the filter is second order, with a cut-off
frequency selectable via the HPFCUT register. The cut-off frequencies when HPFAPP=1 are shown
in Table 15.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R14
ADC Control
8
HPFEN
1
High Pass Filter Enable
0=disabled
1=enabled
7
HPFAPP
0
Select audio mode or application mode
0=Audio mode (1
st order, fc = ~3.7Hz)
1=Application mode (2
nd order, fc =
HPFCUT)
6:4
HPFCUT
000
Application mode cut-off frequency
See Table 15 for details.
Table 14 ADC Enable Control
HPFCUT
[2:0]
SR=101/100
SR=011/010
SR=001/000
fs (kHz)
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 15 High Pass Filter Cut-off Frequencies (HPFAPP=1). Values in Hz.
Note that the High Pass filter values (when HPFAPP=1) are calculated with the assumption that the
SR register bits are set correctly for the actual sample rate as shown in Table 15.



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