WM8731L WOLFSON [Wolfson Microelectronics plc], WM8731L Datasheet - Page 57

• Manufacturer Part Number: WM8731L
• Description: Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates
• Manufacturer: WOLFSON [Wolfson Microelectronics plc]

WM8731 / WM8731L
Figure 47 ADC Digital Filter Frequency Response –Type 2
Figure 49 ADC Digital Filter Frequency Response –Type 3
ADC HIGH PASS FILTER
w
-100
-100
-20
-40
-60
-80
-20
-40
-60
-80
0
0
0
0
0.5
0.5
1
1
Frequency (Fs)
Frequency (Fs)
The WM8731/L has a selectable digital high pass filter to remove DC offsets. The filter response is
characterised by the following polynomial.
H(z) =
1.5
1.5
1 – 0.9995 z
2
2
1 – z
-1
2.5
2.5
-1
3
3
Figure 48 ADC Digital Filter Ripple –Type 2
Figure 50 ADC Digital Filter Ripple –Type 3
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
0.02
0.01
0.02
0.01
0
0
0
0
0.05
0.05
0.1
0.1
Frequency (Fs)
Frequency (Fs)
0.15
0.15
PD Rev 4.3 August 2006
0.2
0.2
Production Data
0.25
0.25
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