Production Data
WM8750JL
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 45 De-emphasis Frequency Response (44.1kHz)
Figure 46 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 47 De-emphasis Frequency Response (48kHz)
Figure 48 De-emphasis Error (48kHz)
HIGHPASS FILTER
The WM8750JL 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
Figure 49 ADC Highpass Filter Response
PD, April 2012, Rev 4.1
w
55
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
