參數(shù)資料
型號(hào)： QT93LW-12-155.520MHZ
廠商： Q-TECH CORP
元件分類(lèi)： XO, clock
英文描述： CRYSTAL OSCILLATOR, CLOCK, 155.52 MHz, LVDS OUTPUT
封裝： ROHS COMPLIANT, HERMETIC SEALED, MINIATURE, CERAMIC, SMD, 6 PIN
文件頁(yè)數(shù)： 5/5頁(yè)
文件大?。?/td> 255K
代理商： QT93LW-12-155.520MHZ
55
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
QT93W and QT93P SERIES
HIGH-RELIABILITY LVPECL OR LVDS MINIATURE CLOCK OSCILLATORS
2.5 to 3.3Vdc
-
40MHz to 160MHz
QT93W&P (Revision-,August2008)
45
Hybrid Case
Substrate
Die
D/A epoxy
Heat
Die
R1
D/A epoxy
Substrate
D/A epoxy
Hybrid Case
R2
R3
R4
R5
ThermalCharacteristics
JA
JC
CA
Die
T
C
A
J
CA
JC
(Figure2)
(Figure1)
(Figure3)
Theheattransfermodelinahybridpackageisdescribedin
figure2.
Heatspreadingoccurswhenheatflowsintoamateriallayerof
increasedcross-sectionalarea. Itisadequatetoassumethat
spreadingoccursata45°angle.
Thetotalthermalresistanceiscalculatedbysummingthe
thermalresistancesofeachmaterialinthethermalpath
betweenthedeviceandhybridcase.
RT=R1+R2+R3+R4+R5
ThetotalthermalresistanceRT(seefigure3)betweentheheat
source(die)tothehybridcaseistheThetaJunctiontoCase
(ThetaJC)in°C/W.
Thetajunctiontocase(ThetaJC)forthisproductis35°C/W.
Thetacasetoambient(ThetaCA)forthispartis100°C/W.
ThetaJunctiontoambient(ThetaJA)is135°C/W.
MaximumpowerdissipationPDforthispackageat25°Cis:
PD(max)=(TJ(max)–TA)/ThetaJA
WithTJ=175°C(Maximumjunctiontemperatureofdie)
PD(max)=(175–25)/135=1.11W
PhaseNoiseandPhaseJitterIntegration
Phasenoiseismeasuredinthefrequencydomain,andis
expressedasaratioofsignalpowertonoisepowermeasured
ina1Hzbandwidthatanoffsetfrequencyfromthecarrier,e.g.
10Hz,100Hz,1kHz,10kHz,100kHz,etc. Phasenoisemeas-
urementismadewithanAgilentE5052ASignalSourceAna-
lyzer(SSA)withbuilt-inoutstandinglow-noiseDCpower
supplysource. TheDCsourceisfloatedfromthegroundand
isolatedfromexternalnoisetoensureaccuracyandrepeatabil-
ity.
Inordertodeterminethetotalnoisepoweroveracertain
frequencyrange(bandwidth),thetimedomainmustbe
analyzedinthefrequencydomain,andthenreconstructedin
thetimedomainintoanrmsvaluewiththeunwantedfrequen-
ciesexcluded. ThismaybedonebyconvertingL(f)backto
Sφ(f)overthebandwidthofinterest,integratingandperform-
ingsomecalculations.
ThevalueofRMSjitteroverthebandwidthofinterest,e.g.
10kHzto20MHz,10Hzto20MHz,represents1standarddevi-
ationofphasejittercontributedbythenoiseinthatdefined
bandwidth.
Figure1showsatypicalPhaseNoise/Phasejitterofa
QT93LW,3.3Vdc,100MHzclockatoffsetfrequencies10Hz
to10MHz,andphasejitterintegratedoverthebandwidthof
12kHzto20MHz.
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