WM8980CGEFL/RV WOLFSON [Wolfson Microelectronics plc], WM8980CGEFL/RV Datasheet - Page 32

• Manufacturer Part Number: WM8980CGEFL/RV
• Description: Stereo CODEC with Speaker Driver and Video Buffer
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8980
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SELECTABLE HIGH PASS FILTER
Table 14 ADC Enable Control
Table 15 High Pass Filter Cut-off Frequencies (HPFAPP=1). Values in Hz.
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.
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.
HPFCUT
[2:0]
000
001
010
011
100
101
110
111
R14
ADC Control
REGISTER
ADDRESS
102
131
163
204
261
327
408
82
8
8
7
6:4
SR=101/100
BIT
11.025
113
141
180
225
281
360
450
563
HPFEN
HPFAPP
HPFCUT
LABEL
122
153
196
245
306
392
490
612
12
102
131
163
204
261
327
408
16
82
1
0
000
DEFAULT
SR=011/010
fs (kHz)
22.05
113
141
180
225
281
360
450
563
High Pass Filter Enable
0=disabled
1=enabled
Select audio mode or application mode
0=Audio mode (1
1=Application mode (2
HPFCUT)
Application mode cut-off frequency
See Table 15 for details.
122
153
196
245
306
392
490
612
24
102
131
163
204
261
327
408
32
82
DESCRIPTION
SR=001/000
st
44.1
113
141
180
225
281
360
450
563
order, fc = ~3.7Hz)
PP, Rev 3.8, May 2012
nd
order, fc =
Pre-Production
122
153
196
245
306
392
490
612
48
32