wm8918 Wolfson Microelectronics plc, wm8918 Datasheet - Page 91
wm8918
Manufacturer Part Number
wm8918
Description
Ultra Low Power Dac For Portable Audio Applications
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM8918.pdf
(175 pages)
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Production Data
w
8-bit mode (without Companding) may be enabled by setting AIFRX_COMPMODE=1 or
AIFTX_COMPMODE=1, when AIFRX_COMP=0 and AIFTX_COMP=0.
Table 54 8-bit Companded Word Composition
Figure 57 μ-Law Companding
Figure 58 A-Law Companding
SIGN
BIT7
120
100
120
100
80
60
40
20
80
60
40
20
0
0
0
0
0.1
EXPONENT
BIT [6:4]
0.2
0.2
0.3
u-law Companding
A-law Companding
0.4
Normalised Input
0.4
Normalised Input
0.5
0.6
0.6
0.7
MANTISSA
BIT [3:0]
0.8
0.8
PD, Rev 4.0, September 2010
0.9
1
1
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
WM8918
91
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