參數(shù)資料
型號： SM3E-19.44M
廠商： Connor-Winfield
文件頁數(shù)： 12/36頁
文件大?。?/td> 0K
描述： IC MOD TIMING 19.440MHZ STRAT 3E
標(biāo)準(zhǔn)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 2 of 36 Rev: 04 Date: 01/26/11
Copyright 2011 The Connor-Winfield Corp. All Rights Reserved
Specifications subject to change without notice
General Description
TheSM3EtimingmoduleprovidesaclockoutputthatmeetsorexceedsStratum3EspecificationsgiveninGR-1244-CORE(Issue2),
GR-253-CORE(Issue3)andITU-TG.812(option3).TheSM3Efeatureseightreferenceinputs.Eachinputwillauto-detectthefollowing
referencefrequencies:8kHz,1.544MHz,2.048MHz,12.96MHz,19.44MHz,25.92MHz,38.88MHz,51.84MHzand77.76MHz.
TheSM3Etimingmodulecanbeconfiguredduringproductiontoproduceanoutputupto77.76MHz.Thisoutputisderivedfrom
anonboardVCXOandmustbespecifiedwhenordering.ThesecondoutputisaBITSoutputselectableforeither1.544or2.048
MHz.Themaster/slaveoutputis8KHz.TheusercommunicateswiththeSM3EmodulethroughaSPIport.Theusercontrolsthe
SM3Eoperationbywritingtotheappropriateregisters.TheusercanalsoenableordisableSPIoperationthroughaSPI_Enablepin.
TheSM3Eoffersawiderangeofoptionsforthesystemdesigner.ThebandwidthisSPIPort-selectablefrom0.00084Hzto
1.6Hz.0.0016HzistherecommendedoperationalbandwidthforStratum3Eapplications.The8kHzoutputhasanadjustable
pulsewidth.Thepull-inrangeisalsoadjustabletoestablishthedesiredreferencefrequencyrejectionlimits.AFreeRunfrequency
calibrationvaluecanbewrittentothemoduletoprovideahighdegreeofaccuracyinthefreerunmode.Thereferencefrequencyfor
anygivenreferenceinputisautomaticallydetected.AwealthofstatusinformationisavailablethroughtheSPIPortregisters.The
useralsohasachoicebetweenautonomousorfullmanualcontroloperation.
Inmanualmode,theusercontrolsthemoduleoperatingmodesFreeRun,HoldOverorlockedtoaspecificreference.Ifthe
chosenreferenceisunavailableordisqualifiedthemoduleautomaticallyentersHoldOver.
Inautonomouscontrolmode,operationalmodeselectionoccursautomaticallybasedonreferencepriorityandqualificationstatus.
Whentheactivereferencebecomesdisqualified,themodulewillswitchtoanotherqualifiedreference.Ifnoneisavailable,itwillswitch
toHoldOver.Intherevertivemodethemodulewillseektoacquirethehighestpriorityqualifiedreference.Inthenon-revertivemode
themodulewillnotreturntothepreviousreferenceevenafteritisre-qualifiedunlesstherearenootherqualifiedreferences.
Switchingbetweenreferencesishitless.Likewise,theoutputfrequencyslewrateisminimizedduringanychangeofoperating
mode,includingentryintoandreturnfromFreeRunorHoldOvertoprotecttrafficfromtransient-inducedbiterrors.
ReferenceStatusinformationandtheoperatingmodeinformationisaccessedthroughstatusregisters.Themodulewillsetthe
Interruptpin(SPI_INT)lowtoindicateastatuschange.
FreeRunoperationguaranteesanoutputwithin4.6ppmofnominalfrequencyandHoldOveroperationguaranteestheoutput
frequencywillnotchangebymorethan0.012ppmduringthefirst24hours.Frequencyaccuracyisbasedonaprecisionovento
providethestabiltyrequiredforStratum3Ecompliance.
TheSM3Ecanbeprogrammedtostartupinanymodeorbandwidth.Themodulemayevenbeprogrammedtooperateinafully
autonomousmodewithnofurtherconfigurationrequired.
Themoduleoperateson3.3V±5%withatypicalpowerdrainoflessthan3Watturnon,droppingtoapproximately1W@room
temperatureafterwarmingup.Themoduleoperatesoverthe0°to70°Ccommercialtemperaturerange.
PhasebuildoutcanbeenabledordisabledbymeansoftheSPIport.
Functional Block Diagram
Figure 1
Reference Input Monitor
Control
Mode
Reference
Selection
DPLL
APLL
Reference Priority,
Revertivity and Mask
Table
Bus Interface
EEPROM
DAC
OCXO
VCXO
TRST
TCK
TDO
TDI
TMS
M/S Input
Ref 1 - 8
Reset
M/S
T1/E1
SPI_ENBL
SPI_Clk
SPI_In
SPI_Out
SPI_INT
8
Output 1
M/S Output
BITS_Clk
LOS
LOL
Hold_Good
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