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參數資料
| 型號： | LMX2531LQ2080E |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | XO, clock |
| 英文描述： | PLLatinum High Performance Frequency Synthesizer System with Integrated VCO |
| 中文描述： | PLL FREQUENCY SYNTHESIZER, 80 MHz, QCC36 |
| 封裝： | 6 X 6 MM, 0.80 MM HEIGHT, LEAD FREE, LLP-36 |
| 文件頁數： | 22/25頁 |
| 文件大小： | 589K |
| 代理商： | LMX2531LQ2080E |
2.0 General Programming Information
(Continued)
2.7.7 VCO_ACI_SEL
This bit is used to optimize the VCO phase noise. The recommended values are what are used for all testing purposes, and this
bit should be set as the table below instructs.
Part
VCO_ACI_SEL
8
LMX2531LQ1570E
LMX2531LQ1650E
LMX2531LQ1700E
LMX2531LQ1778E
LMX2531LQ1910E
LMX2531LQ2080E
LMX2531LQ2265E
LMX2531LQ2570E
6
2.7.8 XTLSEL[2:0] -- Crystal Select
XTLSEL
0
1
2
3
4
5
6
7
Crystal Frequency
<
20 MHz
30 - 50 MHz
50 - 70 MHz
>
70 MHz
Manual Mode
Reserved
Reserved
Reserved
The value of this word needs to be changed based on the frequency presented to the OSCin pin in accordance to the table above.
2.8 Register R7
2.8.1 XTLDIV[1:0] -- Division Ratio for Higher Crystal Frequencies
The VCO frequency calibration algorithm is clocked from the OSCin pin frequency. However, this frequency needs to be divided
down in accordance to the table below:
XTLDIV
0
1
2
3
Crystal Division Ratio
Reserved
Divide by 2
Divide by 4
Divide by 8
Crystal Range
Reserved
<
20 MHz
20-40 MHz
>
40 MHz
2.8.2 XTLMAN[11:0] -- Sets the calibration timing for lock time
With the exception of the parts listed in the table below, this bit should be set to zero for normal operation. For those parts in the
table. For f
OSCin
frequencies (expressed in MHz) not shown in the table, this bit value can be calculated as 16 X f
OSCIN
/ Kbit.
Part
Kbit
f
OSCin
10 MHz
36
36
20 MHz
71
71
30.72 Mhz
109
109
61.44 MHz
218
218
76.8 MHz
273
273
LMX2531LQ2080E
LMX2531LQ2570E
4.5
4.5
2.9 REGISTER R8
2.9.1 XTLMAN2 -- Calibration Select
In the case that manual mode for XTLSEL is selected and the OSCin frequency is greater than 40 MHz, this bit should be
enabled, otherwise it should be 0.
L
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMX2531LQ2080E/NOPB | 功能描述:時鐘合成器/抖動清除器 HIGH PERF FREQUENCY SYNTHESIZER SYSTEM RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel |
| LMX2531LQ2220E/NOPB | 功能描述:IC PLL FREQ SYNTH W/VCO 36-LLP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發生器，PLL，頻率合成器 系列:PowerWise® 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數:1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
| LMX2531LQ2265E | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LMX2531LQ2265E/NOPB | 功能描述:鎖相環 - PLL RoHS:否 制造商:Silicon Labs 類型:PLL Clock Multiplier 電路數量: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 |
| LMX2531LQ2294/NOPB | 功能描述:IC PLL FREQ SYNTH W/VCO 36-LLP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發生器，PLL，頻率合成器 系列:PowerWise® 標準包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數:1 比率 - 輸入:輸出:1:10 差分 - 輸入:輸出:是/是 頻率 - 最大:170MHz 除法器/乘法器:無/無 電源電壓:2.375 V ~ 3.465 V 工作溫度:0°C ~ 70°C 安裝類型:* 封裝/外殼:* 供應商設備封裝:* 包裝:* |
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