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WM8980 Datasheet(PDF) 74 Page - Wolfson Microelectronics plc

Part # WM8980
Description  STEREO CODEC WITH SPEAKER DRIVER AND BUFFER
PDF  81 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8980 Datasheet(HTML) 74 Page - Wolfson Microelectronics plc

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WM8980
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PP Rev 1.6 January 2005
74
HIGHPASS FILTER
The WM8980 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
st order IIR with a cut-off of around
3.7Hz.
In applications mode the filter is a 2
nd order high pass filter with a selectable cut-off
frequency.
-40
-35
-30
-25
-20
-15
-10
-5
0
5
0
5
10
15
20
25
30
35
40
45
Frequency (Hz)
Figure 38 ADC Highpass Filter Response, HPFAPP=0
-60
-50
-40
-30
-20
-10
0
10
0
200
400
600
800
1000
1200
Frequency (Hz)
-80
-70
-60
-50
-40
-30
-20
-10
0
10
0
200
400
600
800
1000
1200
Frequency (Hz)
Figure 39 ADC Highpass Filter Responses (48kHz),
HPFAPP=1, all cut-off settings shown.
Figure 40 ADC Highpass Filter Responses (24kHz),
HPFAPP=1, all cut-off settings shown.
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
0
200
400
600
800
1000
1200
Frequency (Hz)
Figure 41 ADC Highpass Filter Responses (12kHz),
HPFAPP=1, all cut-off settings shown.



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