參數(shù)資料
型號(hào)： LMX2485
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： XO, clock
英文描述： 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
中文描述： PLL FREQUENCY SYNTHESIZER, 3000 MHz, PQCC24
封裝： 4 X 4 MM, 0.8 MM, PLASTIC, LLP-24
文件頁(yè)數(shù)： 21/37頁(yè)
文件大小： 861K
代理商： LMX2485
Functional Description
(Note 9)
(Continued)
CE Pin
Low
RF_PD
X
ATPU
Bit Enabled +
Write to RF
N Counter
X
PLL State
Powered Down
(Asynchronous)
Powered Up
Powered Up
Powered Down
( Asynchronous )
High
High
High
X
0
1
Yes
No
No
1.7 DIGITAL LOCK DETECT OPERATION
The RF PLL digital lock detect circuitry compares the differ-
ence between the phase of the inputs of the phase detector
to a RC generated delay of
e
. To indicate a locked state
(Lock = HIGH) the phase error must be less than the
e
RC
delay for 5 consecutive reference cycles. Once in lock (Lock
= HIGH), the RC delay is changed to approximately
δ
. To
indicate an out of lock state (Lock = LOW), the phase error
must become greater
δ
. The values of
e
and
δ
are dependent
on which PLL is used and are shown in the table below:
PLL
RF
IF
e
δ
10 ns
15 ns
20 ns
30 ns
When the PLL is in the power down mode and the Ftest/LD
pin is programmed for the lock detect function, it is forced
LOW. The accuracy of this circuit degrades at higher com-
parison frequencies. To compensate for this, the DIV4 word
should be set to one if the comparison frequency exceeds 20
MHz. The function of this word is to divide the comparison
frequency presented to the lock detect circuit by 4. Note that
if the MUX[3:0] word is set such as to view lock detect for
both PLLs, an unlocked (LOW) condition is shown whenever
either one of the PLLs is determined to be out of lock.
20087704
L
www.national.com
21
相關(guān)PDF資料
PDF描述
LMX2485E 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
LMX2485ESQ 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
LMX2485ESQX 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
LMX2485SQ 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
LMX2485SQX 50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMX2485_0610 制造商:NSC 制造商全稱:National Semiconductor 功能描述:50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800 MHz Integer PLL
LMX2485_08 制造商:NSC 制造商全稱:National Semiconductor 功能描述:50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum⑩ Frequency Synthesizers with 800MHz Integer PLL
LMX24856211EVAL 功能描述:時(shí)鐘和定時(shí)器開發(fā)工具 LMX2485 & LM6211 ACTIVE FILTER RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Modules 類型:Clock Conditioners 工具用于評(píng)估:LMK04100B 頻率:122.8 MHz 工作電源電壓:3.3 V
LMX2485E 制造商:NSC 制造商全稱:National Semiconductor 功能描述:50 MHz - 3.0 GHz High Performance Delta-Sigma Low Power Dual PLLatinum? Frequency Synthesizers with 800 MHz Integer PLL
LMX2485E EVAL 功能描述:BOARD EVALUATION LMX2485E RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評(píng)估演示板和套件 系列:PLLatinum™ 標(biāo)準(zhǔn)包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發(fā)器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板
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