Filter
Top Products
www.ti.com
3.3AnalogInput–ChannelA1
3.4AnalogInputs–ChannelsB0/B1andC0/C1
4DigitalInterface
DigitalInterface
Theoutputfromthebufferstageineachcaseapplies0-5VtotheCHA0(+)inputwhentheappliedsignal
isconnectedtoJ2pin1orJ4pin2.TheappliedsignalisdirectedtotheCHA0(-)inputwhenconnected
viaJ2pin3orJ4pin4.
WhenoperatingtheADS836xwithsingle-endedsignals,itisimportanttokeeptheunusedADCinput
biasedto+2.5V.ThisiseasilyaccomplishedontheEVMbychangingthecomponentsassociatedwith
eithertheinvertingornoninvertinginputonly,leavingthedefaultcomponentvaluesshowninTable1on
theunusedinput.Forexample,toachieveabipolarinputrangeof±10VonCHA0(+),usethecomponent
valuesshownforR1–R4andmovetheshuntonW2position2-3.ComponentsR24,R25,R28,andR29
andtheshuntonW1shouldremaininthedefaultconditionsshowninTable1.
TheanaloginputtotheADS8364/65MEVMboardforchannelA1iscomposedoftheINA159difference
amplifierandtheassociatedcircuitryasshowninFigure2.TheINA159ispoweredfromthe+5-Vanalog
supply,andarrangedasanoninvertingamplifierwithagainof0.2.Theinternal+2.5-Vreferencevoltage
oftheADS836xisappliedtobothREF1andREF2pinsoftheINA159toprovideadirect±10-Vinterface
withbuilt-inleveltranslationtothenoninvertinginputofchannelA1.
Figure2.ChannelA1InputCircuit
TheanaloginputstotheremainingADS836xinputchannelsareroutedtoconnectorJ3andconfigured
withsimpleR/Cfiltersonly.ThisconfigurationallowstheEVMusertoapplyanycustomizedinputcircuitto
thedataconverter.ConnectorJ3iscomposedofamale/femalepass-throughcombinationofpinheader
andsocketwithindustrystandard0.1-inchcenters.
WhentheADS8364/65MEVMisusedincombinationwiththe5-6KInterfaceBoardorHPA-MCUInterface
Board,theDAPSignalConditioningBoard(SLAU105)canbeusedtodrivetheremaininginputchannels.
TheADS8364/65MEVMisdesignedforeasyinterfacingtomultiplecontrolplatforms.Jumperoptionsare
providedontheEVMtoallowcontroloverthestateofChipSelectpin(CS)aswellastheoperatingmode
pins(A0–A2),theResetpin(RST),andtheConversionStartstrobes(HOLDA,HOLDB,andHOLDC).
4ADS8364/65MEVMSLAU189–September2006
SubmitDocumentationFeedback