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參數(shù)資料
| 型號(hào)： | S1T8825B01-R0B0 |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | 1.3GHZ DUAL PLL |
| 中文描述： | 1.3GHz的雙鎖相環(huán) |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 275K |
| 代理商： | S1T8825B01-R0B0 |
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1.3GHZ DUAL PLL
S1T8825B
13
Channel1 and 2 Programmable Counter Division Ratio, N
N = 2
×
(32
×
B + A), B
≥
A
Division ratio: 192 to 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, N = 2
×
(32
×
B + A) = 36240 , 32
×
B + A =18120
N = 18120
÷
32 = 566.25, A = 0.25*32 = 8
∴
B = (566)
10
= (1000110110)
2
, A = (8)
10
= (01000)
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, N = 2
×
(32
×
B + A) = 37032, 32
×
B + A =18516
N = 18516
÷
32 = 578.625, A = 0.625*32 = 20
∴
B = (578)
10
= (1001000010)
2
, A = (20)
10
= (10100)
2
PHASE DETECTOR AND CHARGE PUMP CHARACTERISTICS
Phase difference detection Range: -2
π
to +2
π
When SW = Low
Figure 6.
0
LSB
0
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1
0
0
1
1
0
1
1
0
0
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1
0
0
1
0
MSB
0
LSB
0
1
0
1
0
1
0
0
0
0
1
0
0
1
0
0
0
1
MSB
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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