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WM8950 датащи(PDF) 46 Page - Wolfson Microelectronics plc

номер детали WM8950
подробное описание детали  ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS
PDF  52 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8950 датащи(HTML) 46 Page - Wolfson Microelectronics plc

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WM8950
Preliminary Technical Data
w
PTD Rev 2.1 June 2005
46
5-BAND EQUALISER
The WM8950 has a 5-band equaliser which can be applied to the ADC path. The plots from Figure
38 to Figure 51 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 38 EQ Band 1 – Low Frequency Shelf Filter Cut-offs Figure 39 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 40 EQ Band 2 – Peak Filter Centre Frequencies,
EQ2BW=0
Figure 41 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 42 EQ Band 2 – EQ2BW=0, EQ2BW=1



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