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WM8950 Datasheet(PDF) 52 Page - Cirrus Logic

Part # WM8950
Description  ADC with Microphone Input and Programmable Digital Filters
PDF  60 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

WM8950 Datasheet(HTML) 52 Page - Cirrus Logic

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WM8950
52
Rev 4.5
HIGH-PASS FILTER
The WM8950 has a selectable digital high-pass filter in the ADC filter path.
This filter has two
modes, audio and applications. In audio mode the filter is a 1st order IIR with a cut-off of around
3.7Hz.
In applications mode the filter is a 2nd 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)
-60
-50
-40
-30
-20
-10
0
10
0
200
400
600
800
1000
1200
Frequency (Hz)
Figure 38 ADC High-pass Filter Response, HPFAPP=0
Figure 39 ADC High-pass Filter Responses (48kHz),
HPFAPP=1, all cut-off settings shown.
-80
-70
-60
-50
-40
-30
-20
-10
0
10
0
200
400
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Frequency (Hz)
-90
-80
-70
-60
-50
-40
-30
-20
-10
0
10
0
200
400
600
800
1000
1200
Frequency (Hz)
Figure 40 ADC High-pass Filter Responses (24kHz),
HPFAPP=1, all cut-off settings shown.
Figure 41 ADC High-pass Filter Responses (12kHz),
HPFAPP=1, all cut-off settings shown.



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