Production Data
WM8750L
0
0.4
0.3
0.2
0.1
0
-2
-4
-6
-8
-0.1
-0.2
-0.3
-0.4
-10
0
0
5000
10000
Frequency (Fs)
15000
20000
5000
10000
Frequency (Fs)
15000
20000
Figure 46 De-emphasis Frequency Response (44.1kHz)
Figure 47 De-emphasis Error (44.1kHz)
0
0.4
0.3
0.2
0.1
0
-2
-4
-6
-0.1
-0.2
-0.3
-0.4
-8
-10
0
5000
10000
Frequency (Fs)
15000
20000
0
5000
10000
Frequency (Fs)
15000
20000
Figure 48 De-emphasis Frequency Response (48kHz)
Figure 49 De-emphasis Error (48kHz)
HIGHPASS FILTER
The WM8750L has a selectable digital highpass filter in the ADC filter path to remove DC offsets. The filter response is
characterised by the following polynomial:
1 - z-1
H(z) =
1 - 0.9995z-1
0
-5
-10
-15
0
0.0005
0.001
Frequency (Fs)
0.0015
0.002
Figure 50 ADC Highpass Filter Response
PD, Rev 4.4, August 2012
59
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