參數(shù)資料
型號： SM3E-19.44M
廠商： Connor-Winfield
文件頁數(shù)： 11/36頁
文件大?。?/td> 0K
描述： IC MOD TIMING 19.440MHZ STRAT 3E
標準包裝： 1
系列： SM3
類型： 定時模塊，系統(tǒng)時鐘
PLL： 是
主要目的： 以太網(wǎng)，ADM，DSLAM，SONET/SDH，Stratum，TDM
輸入： LVCMOS
輸出： LVCMOS
電路數(shù)： 1
比率 - 輸入:輸出： 8:3
差分 - 輸入:輸出： 無/無
頻率 - 最大： 19.44MHz
電源電壓： 3.135 V ~ 3.465 V
工作溫度： 0°C ~ 70°C
安裝類型： 通孔
封裝/外殼： 32-DIP 模塊
包裝： 管件
其它名稱： CW643
SM3E 19.44M
SM3E19.44M
SM3E Data Sheet #:
TM054
Page 19 of 36 Rev: 04 Date: 01/26/11
Copyright 2011 The Connor-Winfield Corp. All Rights Reserved
Specifications subject to change without notice
Performance Definitions
Jitter and Wander–Jitterandwanderaredefinedrespectivelyas“theshort-termandlong-termvariationsofthesignificant
instantsofadigitalsignalfromtheiridealpositionsintime”.Theyarethereforethephaseorpositionintimemodulationsofadigital
signalrelativetotheiridealpositions.Thesephasemodulationscaninturnbecharacterizedintermsoftheiramplitudeandfrequency.
Jitterisdefinedasthosephasevariationsatratesabove10Hz,andwanderasthosevariationsatratesbelow10Hz.
Fractional frequency offset and drift–Thefractionalfrequencyoffsetofaclockistheratioofthefrequencyerror(fromthe
nominalordesiredfrequency)tothedesiredfrequency.Itistypicallyexpressedas(npartsin10X),or(nx10-X).Driftisthemeasure
ofaclock’sfrequencyoffsetovertime.Itisexpressedthesamewayasoffset.
Time Interval Error (TIE)–TIEisameasureofwanderandisdefinedasthevariationinthetimedelayofagivensignalrelative
toanidealsignaloveraparticulartimeperiod.Itistypicallymeasuredinns.TIEissettozeroatthestartofameasurement,andthus
representsthephasechangesincethebeginningofthemeasurement.
Maximum Time Interval Error (MTIE)–MTIEisameasurementofwanderthatfindsthepeak-to-peakvariationsinthetimedelay
ofasignalforagivenwindowoftime,calledtheobservationinterval(t).Thereforeitisthelargestpeak-to-peakTIEinanyobservation
intervaloflengtht withintheentiremeasurementwindowofTIEdata.MTIEisthereforeausefulmeasureofphasetransients,
maximumwanderandfrequencyoffsets.MTIEincreasesmonotonicallywithincreasingobservationinterval.
Time Deviation (TDEV)–TDEVisameasurementofwanderthatcharacterizesthespectralcontentofphasenoise.TDEV(tisthe
RMSoffilteredTIE,wherethebandpassfilteriscenteredonafrequencyof0.42/t.
SM3E Performance
Input Jitter Tolerance–Inputjittertoleranceistheamountofjitteratitsinputaclockcantoleratebeforegeneratinganindication
ofimproperoperation.GR-1244andITU-813requirementsspecifyjitteramplitudev.s.jitterfrequencyforjittertolerance.TheSM3E
deviceprovidesjittertolerancethatmeetsthespecifiedrequirements.
Input Wander Tolerance–Inputwandertoleranceistheamountofwanderatitsinputaclockcantoleratebeforegeneratingan
indicationofimproperoperation.GR-1244andITU-813requirementsspecifyinputwanderTDEVv.s.integrationtimeasshownbelow.
IntegrationTime,(seconds)
TDEV(ns)
0.05
≤
τ <10
100
10<
τ<1000
31.6x
τ 0.5
1000
≤
τ
N/A
TheSM3Edeviceprovideswandertolerancethatmeetstheserequirements.
Phase Transient Tolerance–GR-1244specifiesmaximumreferenceinputphasetransientsthataclocksystemmusttolerate
withoutgeneratinganindicationofimproperoperation.ThephasetransienttoleranceisspecifiedinMTIE(nS)v.s.observationtime
from.001to100seconds,asshownbelow.
ObservationtimeS(Seconds)
MTIE(ns)
0.001326
≤S<0.0164
61,000xS
0.0164<S<1.97
925+4600xS
1.97
≤S
10,000
TheSM3EwilltolerateallreferenceinputtransientswithintheGR-1244specification.
Free-run Frequency Accuracy–Theabilityofaclocktoproduceafrequencyascloseaspossibletothenominalfrequencyin
theabsenceofareference.
Hold Over Frequency Stability–Ameasureofaclock’sperformancewhileinHoldOvermodeover24hours,subjectedtothe
specifiedtemperaturevariations.
Performance Specifications
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