WM8985_07 WOLFSON [Wolfson Microelectronics plc], WM8985_07 Datasheet - Page 111

• Manufacturer Part Number: WM8985_07
• Description: Multimedia CODEC With Class D Headphone and Line Out
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

Pre-Production
HIGHPASS FILTER
Figure 46 ADC Highpass Filter Response, HPFAPP=0
Figure 47 ADC Highpass Filter Responses (48kHz),
Figure 49 ADC Highpass Filter Responses (12kHz),
w
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0
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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 WM8985 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
3.7Hz.
frequency.
600
600
25
30
In applications mode the filter is a 2
800
800
35
1000
40
1000
45
1200
1200
Figure 48 ADC Highpass Filter Responses (24kHz),
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10
0
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HPFAPP=1, all cut-off settings shown
nd
200
order high pass filter with a selectable cut-off
400
Frequency (Hz)
st
order IIR with a cut-off of around
600
PP, Rev 3.5, January 2007
800
1000
WM8985
1200
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