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參數(shù)資料
| 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)： | 11/16頁 |
| 文件大小： | 120K |
| 代理商： | S1T8825X01-R0B0 |
1.1GHZ DUAL PLL
S1T8825
11
PRELIMINARY ( VER.2.1 )
PROGRAMMABLE REFERENCE COUNTER
This block generates the reference frequency for the PLL.
The reference divider is composed of 12-bit reference divider and a half fixed divider
Sending certain data to the reference divider allows the setting of any of 6 to 8190 divisions (multiple of two).
R = R1
×
2
0
+
R2
×
2
1
+
…
+ R12
×
2
11
Division ratio: 2
×
R = 2
×
(3~4095) = 6 ~ 8190
Data is shifted in MSB first.
Example) A 21.25MHz X-tal oscillator is connected, and divided into 25kHz steps.
(Reference frequency is 12.5kHz)
21.25 MHz
÷
12.5 kHz = 1700
1700 = 2
×
R
R = (850)
10
= (1101010010)
2
Division
Ratio
R12
R11
R10
R9
R8
R7
R6
R5
R4
R3
R2
R1
3
0
0
0
0
0
0
0
0
0
0
1
1
4
0
0
0
0
0
0
0
0
0
1
0
0
4095
1
1
1
1
1
1
1
1
1
1
1
1
R1
R2
R3
R4
R5
R6
R7
R8
R9
R10
R11
R12
GC2
"1"
GC1
"1"
MSB
LSB
Group Code
Division Ratio of the R counter, R
0
1
0
0
1
0
1
0
1
1
0
0
1
1
LSB
MSB
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