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參數(shù)資料
| 型號(hào)： | LMX2487 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 3.0 GHz - 6.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 3.0 GHz Integer PLL |
| 中文描述： | 為3.0 GHz - 6.0 GHz的高性能Δ-Σ低功耗雙PLLatinum⑩頻率合成器與整數(shù)的3.0 GHz鎖相環(huán) |
| 文件頁數(shù)： | 28/37頁 |
| 文件大?。?/td> | 856K |
| 代理商： | LMX2487 |
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Programming Description
(Continued)
2.3 R2 REGISTER
REGISTER
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
DATA[19:0]
IF_N[18:0]
C3
0
C2
1
C1
0
C0
1
R2
IF_PD
2.3.1 IF_N[18:0] -- IF N Divider Value
IF_N Counter Programming with the 8/9 Prescaler (IF_P=0)
N Value
IF_N[18:0]
IF_B
IF_A
≤
23
24-55
N values less than or equal to 23 are prohibited because IF_B
≥
3 is required.
Legal divide ratios in this range are:
24-27, 32-36, 40-45, 48-54
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.
.
.
.
.
.
.
1
1
1
1
1
1
1
56
57
...
0
0
.
1
0
0
.
1
0
0
.
1
0
0
.
1
0
0
.
1
1
1
.
1
1
1
.
1
1
1
.
1
0
0
.
0
0
0
.
1
0
0
.
1
0
1
.
1
262143
Operation with the 16/17 Prescaler (IF_P=1)
N Value
IF_B
IF_A
≤
47
48-239
N values less than or equal to 47 are prohibited because IF_B
≥
3 is required.
Legal divide ratios in this range are:
48-51, 64-68, 80-85, 96-102, 112-119, 128-136, 144-153, 160-170, 176-187, 192-204, 208-221, 224-238
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
.
.
.
.
.
.
.
.
.
1
1
1
1
1
1
1
1
1
240
241
...
524287
0
0
.
1
0
0
.
1
1
1
.
1
1
1
.
1
1
1
.
1
1
1
.
1
0
0
.
1
0
0
.
1
0
0
.
1
0
1
.
1
2.3.4 IF_PD -- IF Power Down Bit
When this bit is set to 0, the IF PLL operates normally. When it is set to 1, the IF PLL powers down and the output of the IF PLL
charge pump is set to a TRI-STATE mode. If the ATPU bit is set and register R0 is written to, the IF_PD will be reset to 0 and the
IF PLL will be powered up. If the CE pin is held low, the IF PLL will be powered down, overriding the IF_PD bit.
L
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| LMX2487ESQ/NOPB | 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數(shù)量:1 最大輸入頻率:710 MHz 最小輸入頻率:0.002 MHz 輸出頻率范圍:0.002 MHz to 808 MHz 電源電壓-最大:3.63 V 電源電壓-最小:1.71 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:QFN-36 封裝:Tray |
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