Amptek PC5 User manual

Products for Your Imagination
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AMPTEK, Inc. 14DeAngeloDrive,Bedford,MA01730‐2204USA
+1781275‐2242Fax:+1781275‐3470www.amptek.com[e-mail]
PC5UserManual
RevB0‐April,2016
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1Introduction..........................................................................................................................................2
1.1PC5Description.............................................................................................................................2
1.2DP5Family.....................................................................................................................................3
1.3OptionsandVariations.................................................................................................................3
2Specifications........................................................................................................................................4
3MechanicalInterface............................................................................................................................5
3.1Dimensions....................................................................................................................................5
3.2Connectors....................................................................................................................................6
4ElectricalInterface................................................................................................................................9
4.1PowerInterface.............................................................................................................................9
4.2AnalogInputInterface..................................................................................................................9
5PC5Design............................................................................................................................................9
5.1PC5Architecture...........................................................................................................................9
5.2HVBiasSupplyDiscussion...........................................................................................................10
5.3ThermoelectricCoolerDiscussion...............................................................................................11
5.4PreampSignalConnections........................................................................................................12
6PC5ApplicationAdvice.......................................................................................................................12
6.1UsingthePC5withoutaDP5......................................................................................................12
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Products for Your Imagination
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1Introduction
1.1 PC5Description
ThePC5isapowersupplyforthedetectorandpreamplifier.Itprovides(1)thehighvoltagebias
forthedetector(eitherpolarity,upto1500V),(2)powerforthethermoelectriccooler(withclosedloop
temperaturecontrol),and(3)thelowvoltagesrequiredforthepreamplifier(+/‐5Vor+/‐8.5V).
ThesettingsofthePC5mustmatchtheconfigurationofthepreamplifieranddetectororthe
componentsmaybedamaged.TheuserisnotmeanttomodifythePC5configuration.
ThePC5maycomewithasubsetoftheconnectorsinstalledthanshowninthisdocument.Onlythe
connectorsthatarecompatiblewiththeorderedconfigurationareinstalled.
ThePC5canbeusedwithAmptek’sDP5signalprocessororwithacustomsignalprocessor.Figure
1showsthetwomostcommonconfigurations.
1. WiththeDP5asshownatthetop,theDP5controlsthePC5.Itturnsonthepowersupplies,
controlsthehighvoltagebiasandtemperaturebyDACs,monitorstheactualhighvoltageand
temperature,andchecksthebiaspolarity.Theinputpower(5VDC)canbesuppliedintothe
DP5(viaastandardplug)orintothePC5(viaan8pinheaderorstandardplug).
CommunicationsmaybethroughtheDP5orRS232communicationtotheDP5ispossible
throughthePC5.
2. Withadifferentprocessor,thePC5usespotentiometersandfixedresistorstodeterminethe
configuration.Itisnotundersoftwarecontrolandprovidesnoreadout.Powerissupplied
throughthePC5’s8pinheaderorthroughajackonthePC5.Thisisthe“standalone”
configuration.
Figure 1. PC5 two most common configurations.

Products for Your Imagination
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1.2 DP5Family
AmptekhasafamilyofproductsbuiltarounditscoreDP5digitalpulseprocessingtechnology,
designedforpulseheightspectroscopy.Itwasoriginallydesignedforthedetectionofionizingradiation,
principallyX‐rayandgamma‐rayspectroscopy.Agenericsystem,illustratedbelow,includes(a)a
sensor,a.k.a.detector,(b)achargesensitivepreamplifier,(c)analogprefiltercircuitry,(d)anADC,(e)an
FPGAwhichimplementspulseshapingandmultichannelanalysis,(f)acommunicationsinterface,(g)
powersupplies,(h)dataacquisitionandcontrolsoftware,and(i)analysissoftware.
Detector and
Preamplifier
Analog
Prefilter ADC Slow Channel
Peak Detect
Histogram Logic
Counters
Pulse
Selection
C and
Interface
Auxiliary
Signals
Computer
Oscilloscope or
external logic
Digital Processor (DPP)
Fast
Channel
Digital Pulse Shaping
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Figure2.Genericspectroscopysystem
ThecoreDP5technologysharedbyallthesystemsincludestheADC,theFPGA,thecommunication
interface,andthedataacquisitionandcontrolsoftware.AllproductsintheDP5productfamilyinclude
nearlythesamedigitalsignalprocessingalgorithms,thesamecommunicationinterfaces(boththe
primaryserialinterfacesandtheauxiliaryI/O),andusethesamedataacquisitionandcontrolsoftware.
TheDPPMCAsoftwarepackageisacomplete,compileddataacquisitionandcontrolsoftwarepackage
usedacrossthefamily;AmptekalsooffersanSDKforcustomsoftwaresolutions.
TheproductsintheDP5familydifferinthesensorforwhichtheyaredesigned,whichleadsto
changesintheanalogprefilter,powersupplies,andformfactor.Theyalsodifferintheircompleteness:
someofAmptek’sproductsare“complete”whileothersofferonlyaportionofthefunctionalityforthe
usertointegrateintoacompletesystem.
Amptekhaswrittena“UserManualforAmptek’sDP5ProductFamily”whichsummarizesthose
characteristicsthatarecommonacrosstheentireDP5family.Thismanualconcentratesononlythose
aspectswhichareuniquetothePC5circuitboard.
1.3 OptionsandVariations
Configurations
ThePC5wasdesignedsothatitcanbeconfiguredtosupportawidevarietyofdetectors.Some
parameterscanbesetviasoftwarecommands,throughtheDP5(i.e.theHVbiasvoltageorthe
detectorstemperature).Manyotherconfigurationoptionsaresetviahardwarejumpersorminor
changestothecomponentsonthecoreboard(changestotheBill‐of‐Materials).TheseBOMchanges
areindicatedbyasetofconfigurationindicators.
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Products for Your Imagination
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2Specifications
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Physical
Dimensions 8.9x6.4cm(3.5x2.5in)
Weight30g
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General&Environmental
Operatingtemperature ‐40°Cto+65°C(fortheelectronics)
AllelectroniccomponentsintheDP5familyareratedforthe
industrialrange,upto+85oC.Componentsarewarmerthanthe
ambienttemperatureandthuswerecommendlimitingthe
ambienttemperatureto<65oC.
Somedetectorsmayhavetightertemperaturelimits;even
wheretheyoperateoverawiderange,performanceisusuallya
strongfunctionofdetectortemperature.
WarrantyPeriod1Year
TypicalDeviceLifetime5to10years,dependingonuse
StorageandShippingLongtermstorage:10+yearsindryenvironment
TypicalStorageandShipping:‐40°Cto+85°C,10to90%humidity
non‐condensing
ComplianceRoHSCompliant
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Power
NominalInput: @+5VDC:
400mA(2W)typical,atfullcooling.
InputRange: +4Vto+5.5V(at0.5to0.35Atypical)
Initialtransient: 2Afor<100s
PowerSource:ExternalsupplyorUSBbus
ThePC5suppliespowertothepreamplifiers.WhenusedinconjunctionwithaDP5,asistypical,
thepairtogetherdrawabout700mA(3.5W)atfullcooling.

 Products for Your Imagination
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3MechanicalInterface
3.1 Dimensions
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Figure3.Mechanicaloveralldimensions.
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Figure4.Mechanicalconnectorlocationsanddimensions.Alldimensionsininches.

Products for Your Imagination
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3.2 Connectors
NotethatthePC5buildconfigurationdictateswhichofthefollowingconnectorsareinstalled–
neveraretheyallinstalled.
Power(J1)
PowerJackonPC5:HiroseMQ172‐3PA(55)[obsoletedin2016,replacedbyMQ172‐3PA(30)].
MatingPlug:HiroseMQ172‐3SA‐CV(50)[obsoletedin2016,replacedbyMQ172‐3SA‐CV(30)]
[Thereplacementsareform/fit/functioncompatible.]
Pin#Name
1VIN(+5VDC)
2GND
3DoNotConnect
PowerconnectortoXR100(J2)
Part#:Molex22‐28‐8062
Mating:MolexC‐GridCrimpConnector.HousingP/N50‐57‐9006,terminalP/N16‐02‐0119.
Pin#Name
1Detectortemperature.ThisisaninputtothePC5fromthedetector
2HVBias.From0to+/‐1500V,dependingonthedetector.
3‐8.5or‐5V.Suppliespowertothepreamp
4+8.5or+5V.Suppliespowertothepreamp
5GND
6TC+.Providespowertothethermoelectriccooler(<4V)
DP5BackplaneConnector(J3)
Documentedindetailinthe“DP5UserManual.”
AlternatepowerandRS232connector(J4)
ThisisanalternatepowerandRS232connector.InOEMapplications,formatingbetweenboards,
thiscanbemoreusefulthantheboardedgeconnectors.
Part#:Molex71764‐0108(4x2connector)
Mating:MolexC‐GridCrimpConnector.HousingP/N22‐55‐2081,terminalP/N16‐02‐1114.
Pin#Name
1GND
2PowerIn
3RS232‐TX(outputfromDP5)
4RS232‐RX(inputtoDP5)
5Shutdown.HoldingthispinlowturnsoffPC5supplies
6GND
7NC
8GND

Products for Your Imagination
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PowerandsignalconnectortoPA210/PA230(J5)
Part#:SamtecZF1‐10‐01‐T‐WT
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Pin#Name
1GND
2TC+.Providespowertothethermoelectriccooler(<4V)
3+8.5or+5V.Suppliespowertothepreamp
4‐8.5or‐5V.Suppliespowertothepreamp
5Signalreturn.TiedtoGNDonPA210/PA230
6SignalOut
7Detectortemperature.ThisisaninputtothePC5fromthedetector
8GND
9NC
10HVBias.From0to+/‐1500V,dependingonthedetector.
SignalconnectortoDP5forPA210/PA230(J7)
Part#:TMM‐102‐01‐S‐D‐SM
Mating:SMM‐102‐02‐S‐D‐LC
Pin#Name
1SignalOut
2NC
3SignalReturn(tiestopin5ofJ5)
4NC
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 Products for Your Imagination
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PhotoofthetopsideofthePC5
.
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PhotosoftheDP5andPC5showingconnectorlocations. 

Products for Your Imagination
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4ElectricalInterface
4.1 PowerInterface
AbsoluteMaximumPowerSupplyVoltage +5.5VDC
AbsoluteMinimumPowerSupplyVoltage +4.0VDC
InputpoweroutsidethisrangewilldamageDP5components.
4.2 AnalogInputInterface
[ThesespecificationsarefortheDP5analoginput–thePC5passestheanalogsignaltotheDP5.]
AbsoluteMaximumInputVoltageRange ‐5.5Vto+5.5V
Polarity:Eitherpositiveornegative.Configureinfirmware
Resetorresistive:Eitherisacceptablebutmustbeconfiguredinhardware.
Stepsize:5mVto1V.
5PC5Design
5.1 PC5Architecture
+3.3V
Supply
+LV
Supply
-LV
Supply
HV Bias
Thermoelectric
Cooler Supply
1
2
3
4
5
6
7
8
Power In
4.5 to 6.0 VDC
ENABLE
J3
DP5
Backplane
J2
Preamplifier
Connector
Temperature
+5V or +8.5V
-5V or -8.5V
-1500V to + 1500V
RS232-TX
RS232-RX
J4
1
2
4 x 2 header
J1
Power
Connector
Not Used
0 to 3.6V
J5
Preamplifier
Connector
1 x 6 header10 pin ribbon
PC5 Control
Logic and DACs
I2C
Figure 5. PC5 design

Products for Your Imagination
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ThePC5containsseveralseparateswitchingregulators.Fourprovidethepowerforthe
preamplifieranddetector:twolowvoltagesforthepreamplifier,theHVbiasforthedetector,andthe
powerforthethermoelectriccooler.Thereareseveralimportantdetailsforthiscircuit.
ThePC5supplyvoltagemustbebetween+4.5and+6.0VDC.PowercanbesuppliedviaJ1,orJ4,or
fromtheDP5viaJ3.IftheDP5isinstalleditcanbepoweredviathePC5J1orJ4.
Thepowerdissipatedwilldependonmanyvariables.ThePC5,preamplifier,anddetectortypically
drawamaximumof1.5W(300mAat5V).ThePC5andDP5togethertypicallydraw3.5W(700mA
at5V).
Nominalswitchingfrequenciesare>1MHz,exceptfortheHVbiaswhichswitchesat50kHz.
TheenablepincanbecontrolledfromtheDP5orJ4.Theenablepinispulledupto3.3Vwith10
Kohm.IntheabsenceofaDP5,thispullupwillturnonthePC5supplies,unlesstheenablepinis
pulleddownexternally.
ThePC5controllogicisgenerallyundercontroloftheDP5viaI2C.Thisenablesthevarioussupplies,
determinesthesetpoint,andmonitorsthevalueswhicharereportedbacktotheDP5.IfnoDP5is
usedthenpotentiometersandresistorsareinstalledtoprovidefixedcontrol.
5.2 HVBiasSupplyDiscussion
AsimplifiedschematicfortheHVsupplyisshownintheschematicbelowforpositivepolarity.The
outputisdividedbyafactorof500intotheerroramplifiercircuit.TP12measurestheHVsetpoint
whileTP13measurestheactualHVbias.Bothmeasure2mV/V,sofora240Vbiasthesetestpoints
shouldbe0.48V.ForusewithaDP5,VR1isnotinstalledandtheDACcontrolsthevalue.Foruse
withoutaDP5,VR1isinstalled(alongwithothercomponents)andtheDACisdisconnected.
Error
Amplifier
MultiplierOscillator
100MEG
200K
RC Filter
2.5 MEG
VR1
Bias
0 to +/-1500V
TP12
TP13
3V
DAC
HVMON
HVSET
Figure6.SchematicforHVBiassupplycircuit.
Negativepolarityissimilarbutthedivideroutputisinverted.BothHVMONandHVSETarestill
positive.Changingpolarityrequiresremovalandinstallationofseveralzeroohmresistorsandis
doneatthefactory.
Thebiaspolarityandmagnitudeareselectedbasedonthedetectorinuse.Theseareveryimportant,
sincethewrongpolarityorexcessmagnitudecancauseirreparabledamagetoadetector.Thistype
ofdamageisnotcoveredunderwarranty.
TheoutputRCfilterhasaseriesresistanceof2.5M.Thisprovidescurrentlimiting(0.6mA
maximum).Becausethecontrolfeedbackistakenafterthefilter,thevoltagedropacrossthe2.5M

Products for Your Imagination
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filteriscompensatedfor–inotherwords,theoutputHVshouldbeindependentofload1.Alsonote
thattheoutputofthefilter,attheJ2orJ5connector,cannotbemeasuredwithaconventionalDVM
(inputimpedance10M).Ahighimpedanceprobeisrequired.
5.3 ThermoelectricCoolerDiscussion
Thecontrolcircuitforthethermoelectriccoolerisshownintheschematicbelow.Thiscircuit
maintainsafixedtemperatureratherthanafixedoutputvoltage.Atemperaturesensorislocatedin
thedetectorhybrid.Theconditioningcircuitrygeneratesanoutputof10mV/K(2.2Vat220K).Thisis
comparedtothesetpointtogeneratetheerrorsignal.
Error
Amplifier
Supply RC Filter TEC
Power
TP16
TP17
Conditioning Temperature
Sensor
VR3
3V
DAC
TEMPSET
TEMPMON
Figure7.Schematicforthermoelectriccoolersupplycircuit.
ForusewithaDP5,VR3isnotinstalledandtheDACcontrolsthevalue.ForusewithoutaDP5,VR3
isinstalled(alongwithothercomponents)andtheDACisdisconnected.Thereexistsamaximum
temperaturedifferentialwhichagivencoolercanachieve.Ifthesetpointislowerthanthis,thenthe
supplywillprovidemaximalcooling(withanoutputcurrentlimit)butthedetectortemperatureisno
longerregulated.Itwillchangeasthesystemtemperaturechanges.
Atypicaltwo‐stagecoolercangeneratean85°C∆T.Example:Ifroomtemperatureis20°C,then
themaximumcoldtemperatureis‐65°C.Itisvitalthatthedetectortemperatureremainconstant.
Thereforethesetpointmustbesetsuchthatnomatterwhattheambienttemperaturereaches,the
detectortemperaturestayconstant.Example:Ifroomtemperatureis40°Cthetemperaturesetpoint
mustbesetsuchthatthisisregulated,sothecoldestthedetectorcanbesettois‐45°C.Thismeans
thatevenat20°Croomtemperaturethedetectorwillbeat‐45°C,butitwillbeconstantfrom20to40
°C.
Thetemperaturesensor,insidethedetector,isa1N914.Theforwardvoltage,atafixedcurrent,is
afunctionoftemperatureandisusedtoregulatethedetectortemperature.Atypicalcalibrationcurve
canbefoundatwww.amptek.com.
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
1NotethatPC5searlierthanRevD0(early2013)takethefeedbackfrombeforetheoutputfilter,sothat
therewillbesomevoltagedropacrossthe2.5Mfilterdependingoncurrent.

Products for Your Imagination
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5.4 PreampSignalConnections
TheschematicbelowillustrateshowthepreampsignalisbroughttoJ7forPA210/230applications.
Figure 8. Preamp signal connections
6PC5ApplicationAdvice
6.1 UsingthePC5withoutaDP5
ThePC5mustbeorderedwiththecorrectconfiguration.Itisnotintendedfortheusertochange
configurationsfordifferentproducts.
XR100
WhenusingthePC5withanXR100boxthefollowingconfigurationisneeded:
Preamppowersetto+/‐8.5V(R16=0Ohm/short,R18=open).
J2connectorusedtoconnectpowertoXR100.
VR1andadditionalcomponentsinstalledforHVcontrol(installedatthefactory).
VR3andadditionalcomponentsinstalledfortemperaturecontrol(installedatfactory).
XR100AmpOutconnecteddirectlytousersuppliedsignalprocessor.
InputpowerisappliedeithertoJ1withtheACadapterortoJ4fromapowersupply.
PA‐210/PA‐230
WhenusingthePC5withaPA‐210orPA‐230thefollowingconfigurationisneeded:

Products for Your Imagination
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Preamppowersetto+/‐5V(R16=open,R18=0Ohm/short).
VR1andadditionalcomponentsinstalledforHVcontrol(installedatthefactory).
VR3andadditionalcomponentsinstalledfortemperaturecontrol(installedatfactory).
J5installedandconnectedtoPApreampwithflexcable.
J7installed.UnliketheXR100thathasaseparatesignalout,thePApreampssendthe
signalthroughthepowerflexcable.Asaresult,thesignalmustbetakenfromthePC5J7
connectorandthenconnectedtotheusersuppliedsignalprocessor.
InputpowerisappliedeithertoJ1withtheACadapterortoJ4fromapowersupply.
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