WM8985GEFL Wolfson Microelectronics, WM8985GEFL Datasheet - Page 114

• Manufacturer Part Number: WM8985GEFL
• Description: Audio CODECs Multimedia CODEC with Class D HP
• Manufacturer: Wolfson Microelectronics

Specifications of WM8985GEFL

• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: QFN-32
• Minimum Operating Temperature: - 25 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

WM8985
HIGHPASS FILTER
Figure 47 ADC Highpass Filter Response, HPFAPP=0
Figure 48 ADC Highpass Filter Responses (48kHz),
Figure 50 ADC Highpass Filter Responses (12kHz),
w
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-40
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-90
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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 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 49 ADC Highpass Filter Responses (24kHz),
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10
0
0
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
PD, Rev 4.6, July 2009
800
Production Data
1000
1200
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