WM8581 Datasheet, PDF (90/94 Pages) Wolfson Microelectronics plc – Multichannel CODEC with S/PDIF Transceiver

WM8581
ADC FILTER RESPONSES
0
-20
-40
-60
-80
0
0.5
1
1.5
2
2.5
Frequency (Fs)
Figure 46 ADC Digital Filter Frequency Response
Product Preview
0.02
0.015
0.01
0.005
0
-0.005
-0.01
-0.015
-0.02
3
0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5
Frequency (Fs)
Figure 47 ADC Digital Filter Ripple
ADC HIGH PASS FILTER
The WM8581 has a selectable digital high pass filter to remove DC offsets. The filter response is characterised by the following
polynomial.
H(z) =
1 - z^-1
1 - 0.9995z^-1
0
-5
-10
-15
0
0.0005
0.001
0.0015
Frequency (Fs)
Figure 48 ADC Highpass Filter Response
0.002
w
PP Rev 1.0 March 2006
90