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WM8950 데이터시트(PDF) 37 Page - Wolfson Microelectronics plc

부품명 WM8950
상세설명  ADC WITH MICROPHONE INPUT AND PROGRAMMABLE DIGITAL FILTERS
PDF  52 Pages
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제조업체  WOLFSON [Wolfson Microelectronics plc]
홈페이지  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8950 데이터시트(HTML) 37 Page - Wolfson Microelectronics plc

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Preliminary Technical Data
WM8950
w
PTD Rev 2.1 June 2005
37
The PLL performs best when f2 is around 90MHz. Its stability peaks at N=8. Some example settings
are shown in Table 31.
MCLK
(MHz)
(F1)
DESIRED
OUTPUT
(MHz)
F2
(MHz)
PRESCALE
DIVIDE
POSTSCALE
DIVIDE
R
N
(Hex)
K
(Hex)
12
11.29
90.3168
1
2
7.5264
7
86C227
12
12.288
98.304
1
2
8.192
8
3126E9
13
11.29
90.3168
1
2
6.947446
6
F28BD5
13
12.288
98.304
1
2
7.561846
7
8FD526
14.4
11.29
90.3168
1
2
6.272
6
45A1CB
14.4
12.288
98.304
1
2
6.826667
6
D3A06D
19.2
11.29
90.3168
2
2
9.408
9
6872B0
19.2
12.288
98.304
2
2
10.24
A
3D70A4
19.68
11.29
90.3168
2
2
9.178537
9
2DB493
19.68
12.288
98.304
2
2
9.990243
9
FD80A0
19.8
11.29
90.3168
2
2
9.122909
9
1F76F8
19.8
12.288
98.304
2
2
9.929697
9
EE009F
24
11.29
90.3168
2
2
7.5264
7
86C227
24
12.288
98.304
2
2
8.192
8
3126E9
26
11.29
90.3168
2
2
6.947446
6
F28BD5
26
12.288
98.304
2
2
7.561846
7
8FD526
27
11.29
90.3168
2
2
6.690133
6
BOAC94
27
12.288
98.304
2
2
7.281778
7
482297
Table 31 PLL Frequency Examples
GENERAL PURPOSE INPUT/OUTPUT
The CSB/GPIO pin can be configured to perform a variety of useful tasks by setting the GPIOSEL
register bits. The GPIO is only available in 2 wire mode.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
2:0
GPIOSEL
000
CSB/GPIO pin function select:
000=CSB input
001=Reserved
010=Temp ok
011=Amute active
100=PLL clk o/p
101=PLL lock
110=Reserved
111=Reserved
3
GPIOPOL
0
GPIO Polarity invert
0=Non inverted
1=Inverted
R8
GPIO
control
5:4
OPCLKDIV
00
PLL Output clock division ratio
00=divide by 1
01=divide by 2
10=divide by 3
11=divide by 4
Table 32 CSB/GPIO Control



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