WM8753LEB/RV WOLFSON [Wolfson Microelectronics plc], WM8753LEB/RV Datasheet - Page 66
![no-image](/images/no-image-200.jpg)
WM8753LEB/RV
Manufacturer Part Number
WM8753LEB/RV
Description
HI FI AND TELEPHONY DUAL CODEC
Manufacturer
WOLFSON [Wolfson Microelectronics plc]
Datasheet
1.WM8753LEBRV.pdf
(87 pages)
- Current page: 66 of 87
- Download datasheet (2Mb)
Advanced Information
w
Table 62 PLL and Clocking Control
The PLL frequency ratio R = f
Figure 26 ) can be set using K and N:
N = int R
K = int (2
Example:
mclk=12MHz, required clock = 12.288MHz.
R should be chosen to ensure 5 < N < 13. There is a divide by 4 and a selectable divide by 2 after the
PLL which should be set to meet this requirement. Enabling the divide by 2 sets the required f
12.288MHz = 98.304MHz.
R = 98.304 / 12 = 8.192
N = int R = 8
k = int ( 2
R53 (35h)
PLL1
Control (1)
R57 (39h)
PLL2
Control (1)
22
22
(R-N))
x (8.192 – 8)) = 805306 = C49BAh
5
4
3
2
1
0
5
4
3
2
1
0
2
/f
1
MCLK1DIV2
MCLK2DIV2
(see
CLK1DIV2
CLK2DIV2
PLL1DIV2
PLL2DIV2
CLK1SEL
CLK2SEL
PLL1RB
PLL1EN
PLL2RB
PLL2EN
0
0
0
0
1
0
0
0
0
0
1
0
CLKOUT1 select
0 : from MCLK pin
1 : from PLL1
CLKOUT1 Divide by 2
0 : Divide by 2 disabled
1 : Divide by 2 enabled
MCLK Divide by 2
0 : Divide by 2 disabled
1 : Divide by 2 enabled
PLL1 Output Divide by 2
0 : Divide disabled
1 : Divide enabled
PLL1 reset
0 : PLL reset
1 : PLL active
PLL 1 Enable
0 : Disabled
1 : Enabled
CLKOUT2 select
0 : from MCLK pin
1 : from PLL2
CLKOUT1 Divide by 2
0 : Divide by 2 disabled
1 : Divide by 2 enabled
MCLK Divide by 2
0 : Divide by 2 disabled
1 : Divide by 2 enabled
PLL2 Output Divide by 2
0 : Divide disabled
1 : Divide enabled
PLL2 reset
0 : PLL reset
1 : PLL active
PLL2 Enable
0 : Disabled
1 : Enabled
AI Rev 3.1 June 2004
WM8753L
2
= 8 x
66
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