Advanced Information
WM8753L
REGISTER
ADDRESS
BIT
LABEL
BB
DEFAULT
DESCRIPTION
R10 (0Ah)
7
0
Bass Boost
Bass Control
0 = Linear bass control
1 = Adaptive bass boost
6:4
3:0
BC[2:0]
000
Bass Filter Characteristic – cut-off:
000 = 130Hz at fs = 48kHz
001 = 200Hz at fs = 48kHz
010 = 100Hz at fs = 16kHz
011 = 400Hz at fs = 48kHz
100 = 100Hz at fs = 8kHz
101 = 200Hz at fs = 8kHz
BASS
[3:0]
1111
(Disabled)
Bass Intensity
Code
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
BB=0
BB=1
+9dB
15 (max)
+9dB
14
13
12
11
10
9
+7.5dB
+6dB
+4.5dB
+3dB
+1.5dB
0dB
8
-1.5dB
-3dB
7
6
-4.5dB
-6dB
5
4
-6dB
3
-6dB
2
-6dB
1
Bypass (OFF)
R11 (0Bh)
6
TC
0
Treble Filter Characteristic
Treble Control
0 = High Cutoff (8kHz at 48kHz sampling)
1 = Low Cutoff (4kHz at 48kHz sampling)
3:0
TRBL
[3:0]
1111
(Disabled)
Treble Intensity
0000 or 0001 = +9dB
0010 = +7.5dB
… (1.5dB steps)
1011 to 1110 = -6dB
1111 = Disable
Table 27 Graphic Equaliser
HI-FI DIGITAL TO ANALOGUE CONVERTER (DAC)
After passing through the graphic equaliser filters, digital ‘de-emphasis’ can be applied to the audio
data if necessary (e.g. when the data comes from a CD with pre-emphasis used in the recording). De-
emphasis filtering is available for sample rates of 48kHz, 44.1kHz and 32kHz.
The WM8753L also has a Soft Mute function, which gradually attenuates the volume of the digital
signal to zero. When removed, the gain will ramp back up to the digital gain setting. This function is
enabled by default. To play back an audio signal, it must first be disabled by setting the DACMU bit to
zero.
AI Rev 3.1 June 2004
38
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
