wm9081 Wolfson Microelectronics plc, wm9081 Datasheet - Page 41

• Manufacturer Part Number: wm9081
• Description: Mono Dac With 2.6w Class Ab/d Speaker Driver, Dynamic Range Controller And Retune Mobile Parametric Equalizer
• Manufacturer: Wolfson Microelectronics plc

Figure 26 EQ Band 1 – Low Freq Shelf Filter Response
Figure 28 EQ Band 3 – Peak Filter Response
Pre-Production
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-10
-15
-10
-15
15
10
15
10
-5
-5
5
0
5
0
1
1
10
10
100
100
Frequency (Hz)
Frequency (Hz)
The EQ enable and EQ gain controls are the same as defined for the default mode. The additional
coefficients used in ReTune Mobile mode are held in registers R44 to R61. These coefficients are
derived using tools provided in Wolfson’s WISCE™ evaluation board control software.
Please contact your local Wolfson representative for more details.
EQ FILTER CHARACTERISTICS
The filter characteristics for each frequency band are shown in Figure 26 to Figure 30. These figures
show the frequency response for all available gain settings, using default cut-off/centre frequencies
and bandwidth.
1000
1000
10000
10000
100000
100000
Figure 27 EQ Band 2 – Peak Filter Response
Figure 29 EQ Band 4 – Peak Filter Response
-10
-15
-10
-15
15
10
15
10
-5
-5
5
0
5
0
1
1
10
10
100
100
Frequency (Hz)
Frequency (Hz)
1000
1000
PP, Rev 3.0, April 2009
10000
10000
WM9081
100000
100000
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