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5PowerSupplies
5.1ReferenceVoltages
6EVMOperation
PowerSupplies
Table3.J1PinoutandFunctions
PinNumberSignalDescription
J1.1NAPControlspower-downoptionsontheADS8365(only)usingtheNAPinputpin
J1.3ADDControlsreadoptions,whenHI,addressinformationcanbereadfromthechip
J1.5HOLD_C#Active-lowsignalHOLDCusedtostartaconversiononADCchannelpairC
J1.7HOLD_B#Active-lowsignalHOLDBusedtostartaconversiononADCchannelpairB
J1.9HOLD_A#Active-lowsignalHOLDAusedtostartaconversiononADCchannelpairA
J1.11RESET#Active-lowsignalRESETusedtoplacetheADS7864’sFIFOinresetstate
J1.13NAUnusedontheADS8364/65MEVM
J1.15NAUnusedontheADS8364/65MEVM
J1.17DC_TOUTaUsedwithW10toallowhostprocessortimercontrolofHOLDx
J1.19NAUnusedontheADS8364/65MEVM
TheADS8364/65MEVMboardrequires+5VDCfortheboththeanaloganddigitalsectionoftheADC.
Thesupply(+Vaand+Vd)canrangefrom+4.75VDCto+5.25VDC..Theinternalbuffercanbepowered
throughtheBVddinputvoltageandcanrangefrom2.7VDCto5.5VDC.BecausetheEVMisdesignedto
workwiththe5-6KandHPA-MCUInterfaceBoards,JP1providesdirectconnectiontothecommonpower
busdescribedinSLAU104.
Table4showsthepinoutofJP1:
Table4.JP1Pinout
SignalPinNumberSignal
+VA(positiveinputbuffersupply)12-VA(negativeinputbuffersupply)
+5VA(+VatotheADS8364)34-5VA(Unused)
DGND56AGND
+1.8VD(Unused)78+VD1(Unused)
+3.3VD(usedwithW5forsupportcircuitry)910+5VD(+5Vtopin22oftheADS8364andpin22ofthe
ADS8365)
AlternatepowersourcescanbeappliedviavarioustestpointslocatedontheEVM.Seetheschematicat
theendofthisdocumentfordetails.Note–whilefiltersareprovidedforallpowersupplyinputs,optimal
performanceoftheEVMrequiresaclean,well-regulatedpowersource.
TheADS8364/65MEVMisconfiguredtouseitsinternalreferencethroughjumperW3(seeschematicfor
details).Ifanexternalreferenceisdesired,theshuntjumperonW3shouldbemovedtocoverpins1-2;
theexternalreferencesourcecanbeappliedtothetestpointlabeledTP10referencedtoTP12.The
internal+2.5-VreferenceisstillconnectedtotheinputbufferU1inthiscasetoensurepropermid-point
biasingtochannelA1.
Theanaloginputswingis5Vpp,centeredona+2.5-Vinternalorexternalreference.Theinstalleddevice
acceptsbipolarinputrangeswhenalevelshiftcircuitisusedintheanalogfront-endcircuitry.For
informationonvariouscircuitconfigurations,seesection3.2ofthisdocumentorsection12ofOp-Amps
forEveryone(SLOD006).
OncepowerisappliedtotheEVM,theanaloginputsourcecanbeconnecteddirectlytoJ3orJ4(topor
bottomside)orthroughoptionalamplifierandsignal-conditioningmodulesusingthe5-6KandHPA-MCU
InterfaceBoards.Theanaloginputlevelshouldnotexceed5Vp-p.Theanaloginputrangeisfrom±Vref
(typically2.5VDC)centeredat+2.5V.
6ADS8364/65MEVMSLAU189–September2006
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