wm8940gefl-v Wolfson Microelectronics plc, wm8940gefl-v Datasheet - Page 82

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wm8940gefl-v

Manufacturer Part Number
wm8940gefl-v
Description
Mono Codec With Speaker Driver
Manufacturer
Wolfson Microelectronics plc
Datasheet
WM8940
w
HIGHPASS FILTER
Figure 44 ADC High pass Filter Responses (24kHz),
HPFAPP=1, all cut-off settings shown.
Figure 42 ADC High pass Filter Response, HPFAPP=0
-10
-15
-20
-25
-30
-35
-40
-5
5
0
0
-10
-20
-30
-40
-50
-60
-70
-80
10
0
0
5
10
200
15
Frequency (Hz)
20
400
The WM8940 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 1
3.7Hz.
frequency.
25
Frequency (Hz)
600
30
In applications mode the filter is a 2
35
800
40
45
1000
1200
Figure 43 ADC High pass Filter Responses (48kHz),
HPFAPP=1, all cut-off settings shown.
Figure 45 ADC Highpass Filter Responses (12kHz),
HPFAPP=1, all cutoff settings shown.
-10
-20
-30
-40
-50
-60
10
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
10
0
0
0
nd
order high pass filter with a selectable cut-off
200
200
400
400
st
Frequency (Hz)
order IIR with a cut-off of around
Frequency (Hz)
600
600
PD, Rev 4.2, April 2008
800
800
Production Data
1000
1000
1200
1200
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