參數(shù)資料
型號(hào): QT278L-D-5-M-15.000MHZ
廠商: Q-TECH CORP
元件分類: XO, clock
英文描述: CRYSTAL OSCILLATOR, CLOCK, 15 MHz, LVHCMOS OUTPUT
封裝: ROHS COMPLIANT, HERMETIC SEALED, CERAMIC, SMD, 4 PIN
文件頁數(shù): 7/7頁
文件大?。?/td> 710K
代理商: QT278L-D-5-M-15.000MHZ
77
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
CLASS B+ PRODUCTS
CRYSTAL CLOCK OSCILLATORS
3.3 to 5.0Vdc
-
450kHz to 85MHz
ClassB+Products(Revision-,April2009)
Q-TECH
CORPORATION
Phasenoiseismeasuredinthefrequencydomain,andisexpressedasaratioofsignalpowertonoisepowermeasuredina1Hz
bandwidthatanoffsetfrequencyfromthecarrier,e.g.10Hz,100Hz,1kHz,10kHz,100kHz,etc. Phasenoisemeasurementismade
withanAgilentE5052ASignalSourceAnalyzer(SSA)withbuilt-inoutstandinglow-noiseDCpowersupplysource. TheDCsource
isfloatedfromthegroundandisolatedfromexternalnoisetoensureaccuracyandrepeatability.
Inordertodeterminethetotalnoisepoweroveracertainfrequencyrange(bandwidth),thetimedomainmustbeanalyzedinthe
frequencydomain,andthenreconstructedinthetimedomainintoanrmsvaluewiththeunwantedfrequenciesexcluded. Thismaybe
donebyconvertingL(f)backtoSφ(f)overthebandwidthofinterest,integratingandperformingsomecalculations.
ThevalueofRMSjitteroverthebandwidthofinterest,e.g.10kHzto20MHz,10Hzto20MHz,represents1standarddeviationof
phasejittercontributedbythenoiseinthatdefinedbandwidth.
FigurebelowshowsatypicalPhaseNoise/PhasejitterofaQTX78AC6,5.0Vdc,80MHzclockatoffsetfrequencies10Hzto5MHz,
andphasejitterintegratedoverthebandwidthof12kHzto1MHz.
PhaseNoiseandPhaseJitterIntegration
PeriodJitter
As data rates increase, effects of jitter become critical with
its budgets tighter. Jitter is the deviation of a timing event
of a signal from its ideal position. Jitter is complex and is
composed of both random and deterministic jitter
components. Randomjitter(RJ)istheoreticallyunbounded
and Gaussian in distribution. Deterministic jitter (DJ) is
bounded and does not follow any predictable distribution.
DJ is also referred to as systematic jitter. Atechnique to
measureperiodjitter(RMS)onestandarddeviation(1σ)and
peak-to-peakjitterintimedomainistouseahighsampling
rate(>8Gsamples/s)digitizingoscilloscope. Figureshows
an example of peak-to-peak jitter and RMS jitter (1σ) of a
QTX78AC-24MHz,at5.0Vdc.
RMSjitter(1σ):5.37ps
Peak-to-peakjitter:43ps
Symbol
Definition
∫L(f)
Integratedsinglesidebandphasenoise(dBc)
Sφ(f)=(180/Π)x
2∫L(f)df
Spectraldensityofphasemodulation,alsoknownasRMSphaseerror(indegrees)
RMSjitter=Sφ(f)/(fosc.360°)
Jitter(inseconds)duetophasenoise. NoteSφ(f)indegrees.
相關(guān)PDF資料
PDF描述
QT278L-D-5-M-50.000MHZ CRYSTAL OSCILLATOR, CLOCK, 50 MHz, LVHCMOS OUTPUT
QT278L-D-5-M-FREQ2 CRYSTAL OSCILLATOR, CLOCK, 15 MHz - 50 MHz, LVHCMOS OUTPUT
QT278L-D-6-15.000MHZ CRYSTAL OSCILLATOR, CLOCK, 15 MHz, LVHCMOS OUTPUT
QT278L-D-6-B-15.000MHZ CRYSTAL OSCILLATOR, CLOCK, 15 MHz, LVHCMOS OUTPUT
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