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參數(shù)資料
| 型號： | LMX2531 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | PLLatinum High Performance Frequency Synthesizer System with Integrated VCO |
| 中文描述： | PLLatinum高性能頻率合成器系統(tǒng)的集成VCO |
| 文件頁數(shù)： | 22/25頁 |
| 文件大?。?/td> | 589K |
| 代理商： | LMX2531 |
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(guān)PDF資料 |
PDF描述 |
|---|---|
| LMX2531LQ1650E | PLLatinum High Performance Frequency Synthesizer System with Integrated VCO |
| LMX2531LQ1778E | PLLatinum High Performance Frequency Synthesizer System with Integrated VCO |
| LMX2531LQ2080E | PLLatinum High Performance Frequency Synthesizer System with Integrated VCO |
| LMX2531LQ2265E | OPTOCOUPLER, TRANSISTOR O/P; Channels, No. of:1; Voltage, isolation:5300V; Output type:Transistor; Current, input:60mA; Voltage, output max:55V; Case style:DIL; Temperature, operating range:-55(degree C) to ?(degree C); Approval RoHS Compliant: Yes |
| LMX2531LQ2570E | PLLatinum High Performance Frequency Synthesizer System with Integrated VCO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2531_07 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High Performance Frequency Synthesizer System with Integrated VCO |
| LMX25311146EVAL | 功能描述:時鐘和定時器開發(fā)工具 LMX2531LQ1146 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 |
| LMX25311146EVAL/NOPB | 功能描述:射頻開發(fā)工具 LMX25311146 EVAL MOD RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| LMX25311226EVAL | 功能描述:時鐘和定時器開發(fā)工具 LMX2531LQ1226 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 |
| LMX25311226EVAL/NOPB | 功能描述:射頻開發(fā)工具 LMX25311226 EVAL MOD RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
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