wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 52

• Manufacturer Part Number: wm8918
• Description: Ultra Low Power Dac For Portable Audio Applications
• Manufacturer: Wolfson Microelectronics plc

WM8918
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Table 24 EQ Gain Control
RETUNE
ReTune
frequencies and filter bandwidth for each EQ band, in addition to the gain controls already described.
This enables the EQ to be accurately customised for a specific transducer characteristic or desired
sound profile.
The EQ enable and EQ gain controls are the same as defined for the default mode. The additional
coefficients used in ReTune
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 30 to Figure 34. These figures
show the frequency response for all available gain settings, using default cut-off/centre frequencies
and bandwidth.
TM
EQ GAIN SETTING
TM
Mobile mode provides a comprehensive facility for the user to define the cut-off/centre
11001 to 11111
MOBILE MODE
00000
00001
00010
00011
00100
00101
00110
00111
01000
01001
01010
01011
01100
01101
01110
01111
10000
10001
10010
10011
10100
10101
10110
10111
11000
TM
Mobile mode are held in registers R140 to R157. These coefficients
GAIN (DB)
Reserved
+10
+11
+12
-12
-11
-10
+1
+2
+3
+4
+5
+6
+7
+8
+9
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
PD, Rev 4.0, September 2010
Production Data
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