wm8982gefl-v Wolfson Microelectronics plc, wm8982gefl-v Datasheet - Page 101

• Manufacturer Part Number: wm8982gefl-v
• Description: Mono Codec With Speaker Driver And Video Buffer
• Manufacturer: Wolfson Microelectronics plc

Pre-Production
HIGHPASS FILTER
Figure 58 ADC Highpass Filter Response, HPFAPP=0
Figure 59 ADC Highpass Filter Responses (48kHz),
Figure 61 ADC Highpass Filter Responses (12kHz),
w
-10
-15
-20
-25
-30
-35
-40
-10
-20
-30
-40
-50
-60
-70
-80
-90
-5
-10
-20
-30
-40
-50
-60
10
5
0
10
0
0
0
0
0
5
HPFAPP=1, all cut-off settings shown.
HPFAPP=1, all cut-off settings shown.
200
200
10
15
400
400
Frequency (Hz)
20
Frequency (Hz)
Frequency (Hz)
The WM8982 has a selectable digital highpass filter in the ADC filter path. This filter has two modes,
audio and applications. In audio mode the filter is a 1
applications mode the filter is a 2
600
600
25
30
800
800
35
1000
40
1000
45
1200
1200
nd
Figure 60 ADC Highpass Filter Responses (24kHz),
order high pass filter with a selectable cut-off frequency.
-10
-20
-30
-40
-50
-60
-70
-80
10
0
0
HPFAPP=1, all cut-off settings shown.
200
st
order IIR with a cut-off of around 3.7Hz. In
400
Frequency (Hz)
600
PP, Rev 3.2, September 2008
800
1000
WM8982
1200
101