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參數(shù)資料
| 型號： | LMX2336MDA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | PLL合成/DDS/VCOs |
| 英文描述： | PLL FREQUENCY SYNTHESIZER, 2000 MHz, UUC |
| 封裝： | DIE |
| 文件頁數(shù)： | 9/25頁 |
| 文件大小： | 578K |
| 代理商： | LMX2336MDA |
Application Information (Continued)
Fastlock Circuit Implementation
A diagram of the Fastlock scheme as implemented in Na-
tional Semiconductors LMX2335L/36L PLL is shown in
Fig-
ure 5. When a new frequency is loaded, and the RF1 I
CPo bit
is set high, the charge pump circuit receives an input to de-
liver 4 times the normal current per unit phase error while an
open drain NMOS on chip device switches in a second R2
resistor element to ground. The user calculates the loop filter
component values for the normal steady state consider-
ations. The device configuration ensures that as long as a
second identical damping resistor is wired in appropriately,
the loop will lock faster without any additional stability con-
siderations to account for. Once locked on the correct fre-
quency, the user can return the PLL to standard low noise
operation by sending a MICROWIRE instruction with the
RF1 I
CPo bit set low. This transition does not affect the
charge on the loop filter capacitors and is enacted synchro-
nous with the charge pump output. This creates a nearly
seamless change between Fastlock and standard mode.
DS012807-16
FIGURE 4. Open Loop Response Bode Plot
DS012807-17
FIGURE 5. Fastlock PLL Architecture
www.national.com
17
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相關代理商/技術參數(shù) |
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| LMX2336TM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum⑩ Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336TMX | 功能描述:IC FREQ SYNTH DL 1.1GHZ 20-TSSOP RoHS:否 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™ 標準包裝: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:* 供應商設備封裝:* 包裝:* |
| LMX2336U | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:PLLatinum Ultra Low Power Dual Frequency Synthesizer for RF Personal Communications |
| LMX2336U WAF | 制造商:Texas Instruments 功能描述: |
| LMX2336USLBX | 功能描述:IC FREQ SYNTH DUAL 24LAMINATECSP RoHS:否 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™ 標準包裝: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:* 供應商設備封裝:* 包裝:* |
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