WM8904
Pre-Production
8-bit mode (without Companding) may be enabled by setting DAC_COMPMODE=1 or
ADC_COMPMODE=1, when DAC_COMP=0 and ADC_COMP=0.
BIT7
BIT [6:4]
BIT [3:0]
SIGN
EXPONENT
MANTISSA
Table 58 8-bit Companded Word Composition
u-law Companding
1
120
100
80
60
40
20
0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
Normalised Input
Figure 57 µ-Law Companding
A-law Companding
1
120
100
80
60
40
20
0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.2
0.4
0.6
0.8
1
Normalised Input
Figure 58 A-Law Companding
PP, Rev 3.3, September 2012
100
w