WM8510_06 Datasheet, PDF (78/81 Pages) Wolfson Microelectronics plc – Mono CODEC with Speaker Driver

WM8510
Production Data
HIGHPASS FILTER
The WM8510 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.
5
0
-5
-10
-15
-20
-25
-30
-35
-40
0
5
10
15
20
25
30
35
40
45
Frequency (Hz)
Figure 46 ADC Highpass Filter Response, HPFAPP=0
10
0
-10
-20
-30
-40
-50
-60
0
200
400
600
800
1000
1200
Frequency (Hz)
10
0
-10
-20
-30
-40
-50
-60
-70
-80
0
200
400
600
800
1000
1200
Frequency (Hz)
Figure 47 ADC Highpass Filter Responses (48kHz),
HPFAPP=1, all cut-off settings shown.
Figure 48 ADC Highpass Filter Responses (24kHz),
HPFAPP=1, all cut-off settings shown.
10
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
200
400
600
800
1000
1200
Frequency (Hz)
Figure 49 ADC Highpass Filter Responses (12kHz),
HPFAPP=1, all cut-off settings shown.
w
PD Rev 4.1 December 2006
78