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WM8985GEFL/R Datasheet(PDF) 115 Page - Wolfson Microelectronics plc

Part # WM8985GEFL/R
Description  Multimedia CODEC with Class D Headphone and Line Out
PDF  121 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8985GEFL/R Datasheet(HTML) 115 Page - Wolfson Microelectronics plc

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Production Data
WM8985
w
PD, Rev 4.6, July 2009
115
5-BAND EQUALISER
The WM8985 has a 5-band equaliser which can be applied to either the ADC path or the DAC path.
The plots from Figure 51 to Figure 64 show the frequency responses of each filter with a sampling
frequency of 48kHz, firstly showing the different cut-off/centre frequencies with a gain of
±12dB, and
secondly a sweep of the gain from -12dB to +12dB for the lowest cut-off/centre frequency of each
filter.
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
-15
-10
-5
0
5
10
15
Frequency (Hz)
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
-15
-10
-5
0
5
10
15
Frequency (Hz)
Figure 51 EQ Band 1 Low Frequency Shelf Filter Cut-offs
Figure 52 EQ Band 1 Gains for Lowest Cut-off Frequency
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
-15
-10
-5
0
5
10
15
Frequency (Hz)
10
-1
10
0
10
1
10
2
10
3
10
4
10
5
-15
-10
-5
0
5
10
15
Frequency (Hz)
Figure 53 EQ Band 2 – Peak Filter Centre Frequencies,
EQ2BW=0
Figure 54
EQ Band 2 – Peak Filter Gains for Lowest Cut-off
Frequency, EQ2BW=0
10
-2
10
-1
10
0
10
1
10
2
10
3
10
4
-15
-10
-5
0
5
10
15
Frequency (Hz)
Figure 55 EQ Band 2 – EQ2BW=0, EQ2BW=1



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