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參數(shù)資料
| 型號(hào)： | LMX2355SLBX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2500 MHz, QCC24 |
| 封裝： | PLASTIC, CSP-24 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大小： | 403K |
| 代理商： | LMX2355SLBX |
Programming Description (Continued)
5.2.2 N REGISTER — (8/9/12/13) PRESCALER OPERATING IN FRACTIONAL MODE
(RF_N[6]–RF_N[20])
RF_N_CNTR [14:0]
Divide
Ratio
C Word
B Word
A Word
1–23
Divide Ratios Less than 24 are impossible since it is required that C>=3
24–39
Some of these N values are Legal Divide Ratios, some are not
40
00000000101000
0
41
00000000101000
1
...
...........
0
.
16383
11111111111011
1
N REGISTER — (16/17/20/21) PRESCALER OPERATING IN FRACTIONAL MODE
(RF_N[6]–RF_N[20])
RF_N_CNTR [14:0]
Divide
Ratio
C Word
B Word
A Word
1–47
Divide Ratios Less than 48 are impossible since it is required that C>=3
48–79
Some of these N values are Legal Divide Ratios, some are not
80
00000000101000
0
81
00000000101000
1
...
...........
0
.
32767
11111111111111
1
5.2.3 FRACTIONAL MODULUS ACCUMULATOR (FRAC_CNTR)
(RF_N[2]–RF_N[5])
Fractional Ratio (F)
FRAC_CNTR
Modulus 15
Modulus 16
RF_N[5]
RF_N[4]
RF_N[3]
RF_N[2]
0
0000
0
1/15
1/16
0
1
2/15
2/16
0
1
0
14/15
14/16
1
0
N/A
15/16
1
LMX2354
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