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參數(shù)資料
| 型號： | LMX2364 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer |
| 中文描述： | 2.6千兆赫PLLatinum分數(shù)RF頻率合成器850 MHz的IF頻率合成器整數(shù) |
| 文件頁數(shù)： | 37/39頁 |
| 文件大小： | 694K |
| 代理商： | LMX2364 |
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Supplemental Information
(Continued)
3.5 RF PLL FASTLOCK REFERENCE TABLE
The table below shows most of the trade offs involved in
choosing a steady-state charge pump current (RF_CP), the
FastLock charge pump current (RF_CPF[1:0]), and the
Cycle Slip Reduction Factor CSR.
Parameter
RF_CP
Advantages to Choosing Smaller
1. Allows capacitors in loop filter to be smaller
values making it easier to find physically
smaller components and components with
better dielectric properties.
2. Allows a larger loop bandwidth multiplier for
FastLock, or a higher cycle slip reduction
factor.
The only reason not to always choose this to
16 mA is to make it such that no FastLock
resistor is required for FastLock. For 3rd and
4th order filters, it is not possible to keep the
filter perfectly optimized by simply switching in
a resistor for FastLock.
Do not choose this any larger than necessary
to eliminate cycle slipping. Keeping this small
allows a larger loop bandwidth multiplier for
FastLock.
Advantages to Choosing Larger
Phase noise, especially within the loop
bandwidth of the system will be slightly worse
for lower charge pump currents. If the charge
pump gain is at least 4 mA, most of the
phase noise benefit will be realized.
RF_CPF
This allows the maximum possible benefit for
FastLock.
RF_CSR
This will eliminate cycle slips better.
3.6 CAPACITOR DIELECTRIC CONSIDERATIONS
The LMX2364 has a high fractional modulus and high
charge pump gain for the lowest possible phase noise. One
consideration is that the reduced N value and higher charge
pump may cause the capacitors in the loop filter to become
larger in value. For larger capacitor values, it is common to
have a trade-off between capacitor dielectric quality and
physical size. Using film capacitors or NP0/CG0 capacitors
yields the best possible lock times, where as using X7R or
Z5R capacitors can increase lock time by 0 – 500%. In
general, designs with higher comparison frequencies tend to
be less succeptible to degradations in lock time due to
capacitor dielectric effects. Capacitor dielectrics have very
little impact on phase noise or spurs. Although the use of
lesser quality dielectric capacitors may be unavoidable in
many circumstances, allowing a larger footprint for the loop
filter capacitors, using a lower charge pump current, and
reducing the fractional modulus are all ways to reduce ca-
pacitor values.
L
www.national.com
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| LMX2364TM | 2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX2364EVAL | 功能描述:BOARD EVALUATION LMX2364 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:1 系列:- 傳感器類型:CMOS 成像，彩色（RGB） 傳感范圍:WVGA 接口:I²C 靈敏度:60 fps 電源電壓:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相關(guān)產(chǎn)品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP |
| LMX2364SLEX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer |
| LMX2364SLEX/NOPB | 功能描述:IC FREQ SYNTH 2.6GHZ 24LAMUCSP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):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(yīng)商設(shè)備封裝:* 包裝:* |
| LMX2364TM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:2.6 GHz PLLatinum Fractional RF Frequency Synthesizer with 850 MHz Integer IF Frequency Synthesizer |
| LMX2364TM/NOPB | 功能描述:IC FREQ SYNTH 2.6GHZ 24TSSOP RoHS:是 類別:集成電路 (IC) >> 時鐘/計時 - 時鐘發(fā)生器，PLL，頻率合成器 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:39 系列:- 類型:* PLL:帶旁路 輸入:時鐘 輸出:時鐘 電路數(shù):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(yīng)商設(shè)備封裝:* 包裝:* |
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