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ADS8406
SLAS426A–AUGUST2004–REVISEDDECEMBER2004
TerminalFunctions
nameno.i/odescription
agnd5,8,11,12,14,–analogground
15,44,45
bdgnd25,35–digitalgroundforbusinterfacedigitalsupply
busy36ostatusoutput.highwhenaconversionisinprogress.
byte39ibyteselectinput.usedfor8-bitbusreading.0:nofoldback1:lowbyted[7:0]ofthe16most
significantbitsisfoldedbacktohighbyteofthe16mostsignificantpinsdb[15:8].
convst40iconvertstart.thefallingedgeofthisinputendstheacquisitionperiodandstartsthehold
时期.
cs42ichipselect.thefallingedgeofthisinputstartstheacquisitionperiod.
8-bitbus16-bitbus
DataBus
BYTE=0BYTE=1BYTE=0
db1516od15(msb)d7d15(msb)
DB1417OD14D6D14
DB1318OD13D5D13
DB1219OD12D4D12
DB1120OD11D3D11
DB1021OD10D2D10
DB922OD9D1D9
db823od8d0(lsb)d8
DB726OD7AllonesD7
DB627OD6AllonesD6
DB528OD5AllonesD5
DB429OD4AllonesD4
DB330OD3AllonesD3
DB231OD2AllonesD2
DB132OD1AllonesD1
db033od0(lsb)allonesd0(lsb)
–IN7IInvertinginputchannel
+IN6INoninvertinginputchannel
NC3–Noconnection
REFIN1IReferenceinput
refm47,48ireferenceground
refout2oreferenceoutput.add1-µfcapacitorbetweentherefoutpinandrefmpinwheninternal
referenceisused.
reset38icurrentconversionisabortedandoutputlatchesarecleared(settozeros)whenthispinis
assertedlow.resetworksindependantlyofcs.
rd41isynchronizationpulsefortheparalleloutput.whencsislow,thisservesastheoutputenable
andputsthepreviousconversionresultonthebus.
+va4,9,10,13,43,–analogpowersupplies,5-vdc
46
+vbd24,34,37–digitalpowersupplyforbus
8
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