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| 型號： | S1T8825X01-R0B0 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | OSC 5V SMT 7X5 CMOS PROGRM |
| 中文描述： | 1.1GHz的雙鎖相環(huán) |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 120K |
| 代理商： | S1T8825X01-R0B0 |
1.1GHZ DUAL PLL
S1T8825
13
PRELIMINARY ( VER.2.1 )
Channel1 and 2 Programmable Counter Division Ratio, N
N = 2
×
(32
×
B + A), B
≥
A
Division ratio: 192 ~ 262142
Example) A Signal of 453 MHz is entered into Fin1, and divided into 25 kHz steps.
(Reference frequency is 12.5 kHz)
453 MHz
÷
12.5 kHz = 36240
36240 = 2
×
(32
×
B + A)
∴
B = (1132)
10
= (10001101100)
2
, A = (16)
10
= (10000)
2
Example) A Signal of 462.9 MHz is entered into Fin2, and divided into 25 kHz step.
(Reference frequency is 12.5 kHz)
462.9 MHz
÷
12.5 kHz = 37032
37032 = 2
×
(32
×
B + A)
∴
B = (1157)
10
= (10010000101)
2
, A = (8)
10
= (01000)
2
PHASE DETECTOR AND CHARGE PUMP CHARACTERISTICS
Phase difference detection Range: -2
π
~ +2
π
When SW = Low
Figure 6.
0
MSB
0
0
0
1
0
0
1
1
0
1
1
0
0
0
1
0
1
0
LSB
0
MSB
0
0
1
0
1
0
1
0
0
0
0
1
0
0
1
0
0
1
LSB
f
r
f
p
LD
CP
O
f
r
> f
p
f
r
= f
p
f
r
< f
p
f
r
< f
p
f
r
< f
p
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