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WM8955 датащи(PDF) 30 Page - Wolfson Microelectronics plc

номер детали WM8955
подробное описание детали  STEREO DAC FOR PORTABLE AUDIO APPLICATIONS
PDF  43 Pages
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производитель  WOLFSON [Wolfson Microelectronics plc]
домашняя страница  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8955 датащи(HTML) 30 Page - Wolfson Microelectronics plc

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Product Preview Rev 0.4 May2003
30
The PLL frequencyratio R = f2/f1(see diagram above) can be set using K and N in registers 44 (2Ch)
to 46 (2Eh):
N= int (R)
K= int (2
22 (R-N))
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
8:5
N
01000
Integer part of PLL input/output
frequencyratio. Use values greater
than 5 and less than 13.
R44 (2Ch)
PLL Control (1)
3:0
K [21:18]
0011
R45 (2Dh)
PLL Control (2)
8:0
K [17:9]
024h
R46 (2Eh)
PLL Control (3)
TBD
K [8:0]
1BAh
Fractional part of PLL input/output
frequencyratio (treat as one 22-digit
binarynumber)
Table 20 PLL Frequency Ratio Control
The PLL performs best when f2 is around 90MHz. Its stabilitypeaks at N=8. Some example settings
are shown below.
MCLK
(MHz)
DESIRED
OUTPUT
(MHz)
F2
(MHz)
MCLK
DIV2
PLL
OUT
DIV2
CLK
OUT
DIV2
RF2
(Hex)
K
(Hex)
11.91
11.2896
90.3168
0
1
0
7.5833
7
25545C
11.91
12.288
98.304
0
1
0
8.2539
8
103FF6
12
11.2896
90.3168
0
1
0
7.5264
7
21B089
12
12.288
98.304
0
1
0
8.192
8
C49BA
13
11.2896
90.3168
0
1
0
6.9474
6
3CA2F4
13
12.288
98.304
0
1
0
7.5618
7
23F548
14.4
11.2896
90.3168
0
1
0
6.272
6
116872
14.4
12.288
98.304
0
1
0
6.8267
6
34E818
19.2
11.2896
90.3168
1
1
0
9.408
9
1A1CAC
19.2
12.288
98.304
1
1
0
10.24
A
F5C28
19.68
11.2896
90.3168
1
1
0
9.1785
9
B6D22
19.68
12.288
98.304
1
1
0
9.9902
9
3F6017
19.8
11.2896
90.3168
1
1
0
9.1229
9
7DDCA
19.8
12.288
98.304
1
1
0
9.9297
9
3B8023
24
11.2896
90.3168
1
1
0
7.5264
7
21B089
24
12.288
98.304
1
1
0
8.192
8
C49BA
26
11.2896
90.3168
1
1
0
6.9474
6
3CA2F4
26
12.288
98.304
1
1
0
7.5618
7
23F548
27
11.2896
90.3168
1
1
0
6.6901
6
2C2B30
27
12.288
98.304
1
1
0
7.2818
7
12089E
Table 21 PLL Frequency Examples



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