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參數(shù)資料
| 型號： | LMX2485SQX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 3000 MHz, PQCC24 |
| 封裝： | 4 X 4 MM, 0.8 MM, PLASTIC, LLP-24 |
| 文件頁數(shù)： | 26/37頁 |
| 文件大小： | 861K |
| 代理商： | LMX2485SQX |
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Programming Description
(Continued)
2.1 R0 REGISTER
Note that this register has only one control bit, so the N counter value to be changed with a single write statement to the PLL.
REGISTER
23
22
21
20
19
18
17
16
15
14
DATA[22:0]
13
12
11
10
9
8
7
6
5
4
3
2
1
0
C0
0
R0
RF_N[10:0]
RF_FN[11:0]
2.1.1 RF_FN[11:0] -- Fractional Numerator for RF PLL
Refer to section 2.6.1 for a more detailed description of this control word.
2.1.2 RF_N[10:0] -- RF N Counter Value
The RF N counter contains an 8/9/12/13 and a 16/17/20/21 prescaler. The N counter value can be calculated as follows:
N = RF_P·RF_C + 4·RF_B + RF_A
RF_C
≥
Max{RF_A, RF_B} , for N-2
FM
-1 ... N+2
FM
is a necessary condition. This rule is slightly modified in the case where the
RF_B counter has an unused bit, where this extra bit is used by the delta-sigma modulator for the purposes of modulation.
Consult the tables below for valid operating ranges for each prescaler.
Operation with the 8/9/12/13 Prescaler (RF_P=0)
RF_N
RF_N [10:0]
RF_C [6:0]
RF_B [1:0]
RF_A [1:0]
<
25
25-26
27-30
31
...
1023
>
1023
N values less than 25 are prohibited.
Possible only with a second order delta-sigma engine.
Possible only with a second or third order delta-sigma engine.
0
0
1
.
.
.
1
1
1
N values above 1023 are prohibited.
0
.
1
0
.
1
0
.
1
1
.
1
0
0
0
1
.
1
1
.
1
1
.
1
Operation with the 16/17/20/21 Prescaler (RF_P=1)
RF_N
RF_N [10:0]
RF_C [6:0]
RF_B [1:0]
RF_A [1:0]
<
49
49-50
51-54
55
...
2039
2040-2043
2044-2045
>
2045
N values less than 49 are prohibited.
Possible only with a second order delta-sigma engine.
Possible with a second or third order delta-sigma engine.
0
0
0
1
.
.
.
.
1
1
1
1
Possible with a second or third order delta-sigma engine.
Possible only with a second order delta-sigma engine.
N values greater than 2045 are prohibited.
0
.
1
0
.
1
1
.
1
0
.
0
1
.
1
1
.
1
1
.
1
L
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| LMX2485SQX/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 |
| LMX2486 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:1.0 GHz - 4.5 GHz High Performance Delta-Sigma Low Power Dual PLLatinum TM Frequency Synthesizers with 3.0 GHz Integer PLL |
| LMX2486EVAL | 功能描述:時鐘和定時器開發(fā)工具 LMX2486 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V |
| LMX2486SQ | 制造商:Texas Instruments 功能描述:PLL Frequency Synthesizer Dual 5MHz to 4500MHz 24-Pin LLP EP T/R |
| LMX2486SQ/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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