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WM8980_07 Datasheet, PDF (106/112 Pages) Wolfson Microelectronics plc – Stereo CODEC With Speaker Driver and Video Buffer
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WM8980
Pre-Production
5-BAND EQUALISER
The WM8980 has a 5-band equaliser which can be applied to either the ADC path or the DAC path.
The plots from Figure 60 to Figure 73 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.
15
10
5
0
-5
-10
-15
10-1
100
101
102
103
104
105
Frequency (Hz)
15
10
5
0
-5
-10
-15
-1
0
1
2
3
4
5
10
10
10
10
10
10
10
Frequency (Hz)
Figure 60 EQ Band 1 Low Frequency Shelf Filter Cut-offs Figure 61 EQ Band 1 Gains for Lowest Cut-off Frequency
15
15
10
10
5
5
0
0
-5
-10
-15
10-1
100
101
102
103
104
105
Frequency (Hz)
-5
-10
-15
-1
0
1
2
3
4
5
10
10
10
10
10
10
10
Frequency (Hz)
Figure 62 EQ Band 2 – Peak Filter Centre Frequencies,
EQ2BW=0
Figure 63 EQ Band 2 – Peak Filter Gains for Lowest Cut-off
Frequency, EQ2BW=0
15
10
5
0
-5
-10
-15
10-2
10-1
100
101
102
103
104
Frequency (Hz)
Figure 64 EQ Band 2 – EQ2BW=0, EQ2BW=1
w
PP Rev 3.1 March 2007
106
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