WM8569_06 Datasheet, PDF (31/36 Pages) Wolfson Microelectronics plc – 24-bit, 192kHz Stereo CODEC with Volume Control

Production Data
ADC FILTER RESPONSES
0
-20
-40
-60
-80
0
0.5
1
1.5
2
2.5
Frequency (Fs)
Figure 25 ADC Digital Filter Frequency Response
WM8569
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 26 ADC Digital Filter Ripple
ADC HIGH PASS FILTER
The WM8569 has a selectable digital high pass filter to remove DC offsets. The filter response is characterised by the
following polynomial.
H
(
z)
=
1
−
1 − z ^−1
0.9995z
−1
DIGITAL DE-EMPHASIS CHARACTERISTICS
0
-2
-4
-6
-8
-10
0
2
4
6
8
10
12
14
16
Frequency (kHz)
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
0
2
4
6
8
10
12
14
16
Frequency (kHz)
Figure 27 De-Emphasis Frequency Response (32kHz)
Figure 28 De-Emphasis Error (32kHz)
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PD Rev 4.0 June 2006
31