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參數(shù)資料
| 型號(hào)： | QT71-L-D-4-FREQ1 |
| 廠商： | Q-TECH CORP |
| 元件分類： | XO, clock |
| 英文描述： | CRYSTAL OSCILLATOR, CLOCK, 0.1 MHz - 12 MHz, LVHCMOS OUTPUT |
| 封裝： | ROHS COMPLIANT, HERMETIC SEALED, LEADLESS, CERAMIC, SMD, 28 PIN |
| 文件頁數(shù)： | 6/6頁 |
| 文件大小： | 494K |
| 代理商： | QT71-L-D-4-FREQ1 |
66
Q-TECH Corporation - 10150 W. Jefferson Boulevard, Culver City 90232 - Tel: 310-836-7900 - Fax: 310-836-2157 - www.q-tech.com
Q-TECH
CORPORATION
LEADLESS CHIP CARRIER
CRYSTAL CLOCK OSCILLATORS
1.8 to 15Vdc - 732.4Hz to 125MHz
LeadlessChipCarrier (RevisionD,August2008)(ECO#9414)
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/PhasejitterofaQT66T10M,5.0Vdc,24MHzclockatoffsetfrequencies10Hzto5MHz,
andphasejitterintegratedoverthebandwidthof12kHzto1MHz.
PhaseNoiseandPhaseJitterIntegration
PeriodJitter
Asdataratesincrease,effectsofjitterbecomecriticalwith
itsbudgetstighter. Jitteristhedeviationofatimingevent
of a signal from its ideal position. Jitter is complex and
is composed of both random and deterministic jitter
components. Random jitter (RJ) is theoretically un-
boundedandGaussianindistribution. Deterministicjitter
(DJ) is bounded and does not follow any predictable
distribution. DJisalsoreferredtoassystematicjitter. A
technique to measure period jitter (RMS) one standard
deviation(1σ)andpeak-to-peakjitterintimedomainisto
use a high sampling rate (>8G samples/s) digitizing
oscilloscope. Figure shows an example of peak-to-peak
jitterandRMSjitter(1σ)ofaQT66T-24MHz,at5.0Vdc.
RMSjitter(1σ):8.20ps
Peak-to-peakjitter:70.89ps
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.
QT66T10M,5.0Vdc,24MHz
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| QT66-C-1-04.000MHZ | CRYSTAL OSCILLATOR, CLOCK, 4 MHz, CMOS OUTPUT |
| QT71-L-D-5-M-FREQ2 | CRYSTAL OSCILLATOR, CLOCK, 12 MHz - 125 MHz, LVHCMOS OUTPUT |
| QT71-L-D-6-M-FREQ2 | CRYSTAL OSCILLATOR, CLOCK, 12 MHz - 125 MHz, LVHCMOS OUTPUT |
| QT71-T-1-M-FREQ1 | CRYSTAL OSCILLATOR, CLOCK, 0.1 MHz - 12 MHz, TTL OUTPUT |
| QT66-C-D-12-04.000MHZ | CRYSTAL OSCILLATOR, CLOCK, 4 MHz, CMOS OUTPUT |
相關(guān)代理商/技術(shù)參數(shù) |
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| QT7F | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 P |
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| QT7M | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 P |
| QT7MB | 制造商:Switchcraft 功能描述:QG TWIST INSERT 7 PI |
| QT7MBAU | 制造商:Switchcraft 功能描述:QG TWIST INSERT BLA |
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