Audio CODECs VoIP Mono CODEC

WM8510GEDS/V

Manufacturer Part NumberWM8510GEDS/V
DescriptionAudio CODECs VoIP Mono CODEC
ManufacturerWolfson Microelectronics
WM8510GEDS/V datasheet
 


Specifications of WM8510GEDS/V

Operating Supply Voltage- 0.3 V to + 7 VMaximum Operating Temperature+ 85 C
Mounting StyleSMD/SMTPackage / CaseSSOP-28
Minimum Operating Temperature- 25 CLead Free Status / RoHS StatusLead free / RoHS Compliant
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
Page 51
52
Page 52
53
Page 53
54
Page 54
55
Page 55
56
Page 56
57
Page 57
58
Page 58
59
Page 59
60
Page 60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
Page 52/82

Download datasheet (912Kb)Embed
PrevNext
WM8510
REGISTER
ADDRESS
R5
Companding
control
Table 43 Companding Control
Companding involves using a piecewise linear approximation of the following equations (as set out by
ITU-T G.711 standard) for data compression:
µ-law (where µ=255 for the U.S. and Japan):
F(x) = ln( 1 + µ|x|) / ln( 1 + µ)
A-law (where A=87.6 for Europe):
F(x) = A|x| / ( 1 + lnA)
F(x) = ( 1 + lnA|x|) / (1 + lnA)
The companded data is also inverted as recommended by the G.711 standard (all 8 bits are inverted
for µ-law, all even data bits are inverted for A-law). The data will be transmitted as the first 8 MSB’s
of data.
Companding converts 13 bits (µ-law) or 12 bits (A-law) to 8 bits using non-linear quantization. The
input data range is separated into 8 levels, allowing low amplitude signals better precision than that
of high amplitude signals. This is to exploit the operation of the human auditory system, where
louder sounds do not require as much resolution as quieter sounds. The companded signal is an 8-
bit word containing sign (1-bit), exponent (3-bits) and mantissa (4-bits).
BIT7
SIGN
Table 44 8-bit Companded Word Composition
w
BIT
LABEL
DEFAULT
0
LOOPBACK
0
Digital loopback function
0=No loopback
1=Loopback enabled, ADC data output is
fed directly into DAC data input.
2:1
ADC_COMP
0
ADC companding
00=off
01=reserved
10=µ-law
11=A-law
4:3
DAC_COMP
0
DAC companding
00=off
01=reserved
10=µ-law
11=A-law
-1 ≤ x ≤ 1
} for x ≤ 1/A
} for 1/A ≤ x ≤ 1
BIT[6:4]
EXPONENT
Production Data
DESCRIPTION
BIT[3:0]
MANTISSA
PD, Rev 4.5 ,September 2008
52