wm8770 Wolfson Microelectronics plc, wm8770 Datasheet - Page 46

• Manufacturer Part Number: wm8770
• Description: 24-bit, 192khz 8-channel Codec With Volume Control
• Manufacturer: Wolfson Microelectronics plc

WM8770
ADC FILTER RESPONSES
Figure 31 ADC Digital Filter Frequency Response
ADC HIGH PASS FILTER
The WM8770 has a selectable digital highpass filter to remove DC offsets. The filter response is characterised by the
following polynomial.
Figure 33 ADC Highpass Filter Response
w
-20
-40
-60
-80
-10
-15
0
-5
0
0
0
0.5
0.0005
1
H(z) =
Frequency (Fs)
Frequency (Fs)
1.5
0.001
1 - 0.9995z
2
1 - z
0.0015
2.5
-1
-1
0.002
3
Figure 32 ADC Digital Filter Ripple
-0.005
-0.015
0.015
0.005
-0.01
-0.02
0.02
0.01
0
0
0.05
0.1
0.15
0.2
Frequency (Fs)
0.25
0.3
0.35
PD Rev 4.2 March 2008
0.4
0.45
Production Data
0.5
46