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參數資料
| 型號： | QT392T-5-M-FREQ2 |
| 廠商： | Q-TECH CORP |
| 元件分類： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 15 MHz - 60 MHz, TTL OUTPUT |
| 封裝： | ROHS COMPLIANT, HERMETIC SEALED, CERAMIC, SMD, 4 PIN |
| 文件頁數： | 7/7頁 |
| 文件大?。?/td> | 710K |
| 代理商： | QT392T-5-M-FREQ2 |
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.
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| QT392T-D-1-S-60.000MHZ | CRYSTAL OSCILLATOR, CLOCK, 60 MHz, TTL OUTPUT |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| QT3F | 制造商:Switchcraft 功能描述:QG TWIST INSERT 3 P |
| QT3FB | 制造商:Switchcraft 功能描述:QG TWIST INSERT 3 PI |
| QT3FBAU | 制造商:Switchcraft 功能描述:QG TWIST INSERT BLA |
| QT3FZ | 功能描述:XLR 連接器 AAA 3 PIN INSERT Z RoHS:否 制造商:Neutrik 標準:Standard XLR 產品類型:Connectors 型式:Female 位置/觸點數量:3 端接類型:Solder 安裝風格:Cable 方向:Vertical |
| QT3M | 制造商:Switchcraft 功能描述:QG TWIST INSERT 3 P |
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