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參數(shù)資料
型號(hào): LMX2430TM
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類(lèi): XO, clock
英文描述: PLLatinum Dual High Frequency Synthesizer for RF Personal Communications
中文描述: PLL FREQUENCY SYNTHESIZER, 3000 MHz, PDSO20
封裝: PLASTIC, TSSOP-20
文件頁(yè)數(shù): 36/49頁(yè)
文件大?。?/td> 943K
代理商: LMX2430TM
1.0 Functional Description
(Continued)
1.8.3 Digital Filtered Lock Detect Output
A digital filtered lock detect status generated from the phase
detector is also available on the Ftest/LD output pin if se-
lected. The lock detect digital filter compares the difference
bewteen the phases of the inputs to the PFD to an RC
generated delay of approximately 15 ns. If the phase error is
less than the 15 ns RC delay for 5 consecutive reference
cycles, the PLL enters a locked state (HIGH). Once in lock,
the RC delay is changed to approximately 30 ns. Once the
phase error becomes greater than the 30 ns RC delay, the
PLL falls out of lock (LOW). When the PLL is in powerdown
mode, the Ftest/LD output is forced LOW. A flow chart of the
digital filtered lock detect output is shown below.
20053503
Similarly, three separate digital filtered lock detect signals
are routed to the multiplexer. Two of these monitor the lock
status of the individual synthesizers. The third detects the
condition when both the RF and IF synthesizers are in a
locked state. External circuitry is not required when the
digital filtered lock detect option is selected. Refer to
Section
2.10
for details on how to program the different digital filtered
lock detect options.
L
www.national.com
36
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2430TM/NOPB 功能描述:鎖相環(huán) - PLL 3Ghz High Freq Dual Pll RoHS:否 制造商:Silicon Labs 類(lèi)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
LMX2430TMX 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類(lèi)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
LMX2430TMX/NOPB 功能描述:鎖相環(huán) - PLL RoHS:否 制造商:Silicon Labs 類(lèi)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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LMX2433EVAL/NOPB 功能描述:時(shí)鐘和定時(shí)器開(kāi)發(fā)工具 LMX2433 EVAL BOARD RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類(lèi)型:Clock Conditioners 工具用于評(píng)估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V
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