công cụ tìm kiếm bảng dữ liệu linh kiện điện tử |
|
SM3-ITG bảng dữ liệu(PDF) 7 Page - Connor-Winfield Corporation |
|
SM3-ITG bảng dữ liệu(HTML) 7 Page - Connor-Winfield Corporation |
7 / 32 page SM3-ITG Data Sheet #: TM074 Page 7 of 32 Rev: 05 Date: 09/06/11 © Copyright 2011 The Connor-Winfield Corp. All Rights Reserved Specifications subject to change without notice Detailed Description continued TheM/SOutputortheOutput1ofeachdevicemaybecross-connectedtotheotherdevice’sM/SRefinput.Thedeviceauto- detectsthefrequencyontheM/SRefinput.MasterorslavestateofadeviceisdeterminedbytheM/Spin.Thus,master/slavestateis alwaysmanuallycontrolledbytheapplication.Themastersynchronizestotheselectedinputreference,whiletheslavesynchronizes totheM/SRefinput.(Notethat8kHzframephasealignmentismaintainedacrossamaster/slavepairofdevicesonlyifM/SOutputis usedasthecrosscouplesignal.) Theunitoperatinginslavemodelocksonandphase-alignstothecross-referenceclock(M/SOutputorOutput1)fromtheunit inmastermode.Thephaseskewbetweentheinputcross-referenceandtheoutputclockfortheslaveunitistypicallylessthan±1ns (under±3nsindynamicsituations,includingreferencejitterandwander). PerfectphasealignmentofthetwoOutput1outputclockswouldrequirenodelayonthecross-referenceclockconnection. Toaccommodatepathlengthdelays,theSM3-ITGprovidesaprogrammablephaseskewfeature.Theslave’sOutput1orM/S Outputmaybephaseshifted-32nSto+31.75nSrelativetoM/SInputaccordingtothecontentsoftheMS_Phase_Offsetregisterto compensateforthepathlengthoftheM/SOutputorOutput1toM/SInputconnection.Thisoffsetmaythereforebeprogrammedto exactlycompensatefortheactualpathlengthdelayassociatedwiththeparticularapplication’scross-referencetraces.Theoffsetmay furtherbeadjustedtoaccommodateanyoutputclockdistributionpathdelaydifferences.Thus,master/slaveswitcheswiththeSM3- ITGdevicesmaybeaccomplishedwithnear-zerophasehits. Thefirsttimeaunitbecomesaslave,suchasimmediatelyafterpower-up,itsoutputclockphasestartsoutarbitrary,andwill quicklyphase-aligntothecross-referencefromthemasterunit.Thephaseskewwillbeeliminated(orconvergedtotheprogrammed phaseoffset)stepbystep.Thewholepull-in-and-lockprocesswillcompleteinabout60seconds.Thereisnofrequencyslew protectioninslavemode.Inslavemode,theunit’smissionistolocktoandfollowthemaster. Onceapairofunitshasbeenoperatinginalignedmaster/slavemode,andamaster/slaveswitchoccurs,theunitthatbecomes masterwillmaintainitsoutputclockphaseandfrequencywhileaphasebuild-out(tothecurrentoutputclockphase)isperformedon itsselectedreferenceinput.Therefore,asmastermodeoperationcommences,therewillbenophaseorfrequencyhitsontheclock output. Likewise,theunitthatbecomestheslavewillmaintainitsoutputclockfrequencyandphasefor1msecbeforestartingtofollowthe cross-reference,protectingthedownstreamclockusersduringtheswitch.Assumingthephaseoffsetisprogrammedfortheactual propagationdelayofthiscross-referencepath,therewillagainbenophasehitsontheoutputclockoftheunitthathastransitioned frommastertoslave. Master / Slave Configuration Figure 3 STC3500 SM3-ITG M/S OUTPUT / OUTPUT1 M/S OUTPUT / OUTPUT1 M/S REF REFS1-4 REFS1-4 M/S REF 2 SM3-ITG 1 Furthermore,underregisteraccesscontrol,abackupholdoverhistoryregisterisprovided.Itmaybeloadedfromtheactiveholdover historyorrestoredtotheactiveholdoverhistory.Theactiveholdoverhistorymayalsobeflushed. Holdovermodemaybeenteredatanytime.Ifthereisnoholdoverhistoryavailable,theprioroutputfrequencywillbemaintained. Wheninholdover,theapplicationmayread(viaregisteraccess)thetimesinceholdoverwasenterred. Master/Slave Operation PairsofSM3-ITGdevicesmaybeoperatedinamaster/slaveconfigurationforredundanttimingsourceapplications.Atypical configurationisshownbelow.: |
Số phần tương tự - SM3-ITG |
|
Mô tả tương tự - SM3-ITG |
|
|
Link URL |
Chính sách bảo mật |
ALLDATASHEET.VN |
Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không? [ DONATE ] |
Alldatasheet là | Quảng cáo | Liên lạc với chúng tôi | Chính sách bảo mật | Trao đổi link | Tìm kiếm theo nhà sản xuất All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |