Texas Instruments ADS7948 Handleiding
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MUX
AIN0P
AIN0N
AIN1P
AIN1N
ADC
CH SELAVDDREF
GNDREFGND
DVDD
CS
SCLK
SDO
PDEN
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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
ADS7947
,
ADS7948
,
ADS7949
SLAS708A–SEPTEMBER2010–REVISEDSEPTEMBER2019
ADS794xUltra-LowPower,12-,10-,and8-Bit,Dual-Channel,SARADCs
1
1Features
1
•Samplerate:2MSPS
•Pin-compatiblefamily:12-,10-,8-bit
•Highresolution,highthroughput:
–ADS7947:12bit,2.1MSPS
–ADS7948:10bit,2.57MSPS
–ADS7949:8bit,3MSPS
•Excellentperformance:
–Nomissingcodes
–INL:1LSB(max)
–SNR:72dB(min)
•Lowpower:
–7.5mWat2-MSPSoperation
–Autopower-downatlowerspeeds:
–3.8mWat500kSPS
–0.8mWat100kSPS
–0.16mWat20kSPS
•Widesupplyrange:
–Analog:2.7Vto5.5V
–Digital:1.65VtoAVDD
•SPI-compatibleserialinterface
•Extendedtemperaturerange:–40°Cto+125°C
•Tinyfootprint:3-mm×3-mmWQFN
2Applications
•Communicationsystems
•Opticalnetworking
•Medicalinstrumentation
•Battery-poweredequipment
•Dataacquisitionsystems
3Description
TheADS7947,ADS7948,andADS7949arepin-
compatible12-bit,10-bit,and8-bit,2-MSPS,analog-
to-digitalconverters(ADCs),respectively.The
devicesoperateata2-MSPSsampleratewitha
standard16clockdataframe.Inaddition,the
ADS7947(12-bit)canbeoperatedat2.1MSPS,the
ADS7948(10-bit)at2.57MSPS,andtheADS7949
(8-bit)at3MSPSwithashortdataframeoptimized
forthenumberofclockssufficientforconversionwith
nodropinperformance.Thedevicesfeatureboth
outstandingdcprecisionandexcellentdynamic
performance.Thisfamilyofpin-compatibledevices
includesatwo-channelinputmultiplexerandalow-
powersuccessiveapproximationregister(SAR)ADC.
TheADS7947,ADS7948,andADS7949supporta
wideanalogsupplyrangethatsupportsthefull-scale
inputrangeupto5V.AsimpleSPIdigitalinterface,
withadigitalsupplythatcanoperateaslowas1.65
V,allowsforeasyinterfacingtoawidevarietyof
digitalcontrollers.Automaticpower-downcanbe
enabledwhenoperatingatslowerspeedsto
dramaticallyreducepowerconsumption.
Offeredinatiny3-mm×3-mmWQFNpackage,the
ADS7947,ADS7948,andADS7949arefully
specifiedovertheextendedtemperaturerangeof
–40°Cto+125°Candaresuitableforawidevariety
ofdataacquisitionapplicationswherehigh
performance,lowpower,andsmallsizearekey.
DeviceInformation
(1)
PARTNUMBERPACKAGEBODYSIZE(NOM)
ADS794xWQFN(16)3.00mm×3.00mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
ADS794xBlockDiagram
2
ADS7947
,
ADS7948
,
ADS7949
SLAS708A–SEPTEMBER2010–REVISEDSEPTEMBER2019
www.ti.com
ProductFolderLinks:ADS7947ADS7948ADS7949
SubmitDocumentationFeedbackCopyright©2010–2019,TexasInstrumentsIncorporated
TableofContents
1Features..................................................................1
2Applications...........................................................1
3Description.............................................................1
4RevisionHistory.....................................................2
5DeviceComparisonTable.....................................4
6PinConfigurationandFunctions.........................4
7Specifications.........................................................5
7.1AbsoluteMaximumRatings......................................5
7.2ESDRatings..............................................................5
7.3RecommendedOperatingConditions:ADS794x(12-,
10-,8-Bit)...................................................................5
7.4ThermalInformation..................................................6
7.5ElectricalCharacteristics:ADS7947(12-Bit)............6
7.6ElectricalCharacteristics:ADS7948(10-Bit)............8
7.7ElectricalCharacteristics:ADS7949(8-Bit)............10
7.8TimingRequirements..............................................11
7.9SwitchingCharacteristics........................................12
7.10TypicalCharacteristics:ADS7947,ADS7948,
ADS7949..................................................................13
7.11TypicalCharacteristics:ADS7947(12-Bit)............14
8DetailedDescription............................................20
8.1Overview.................................................................20
8.2FunctionalBlockDiagram.......................................20
8.3FeatureDescription.................................................20
8.4DeviceFunctionalModes........................................25
8.5Programming...........................................................26
9ApplicationandImplementation........................28
9.1ApplicationInformation............................................28
10PowerSupplyRecommendations.....................30
11Layout...................................................................31
11.1LayoutGuidelines.................................................31
11.2LayoutExample....................................................32
12DeviceandDocumentationSupport.................33
12.1RelatedLinks........................................................33
12.2ReceivingNotificationofDocumentationUpdates33
12.3CommunityResources..........................................33
12.4Trademarks...........................................................33
12.5ElectrostaticDischargeCaution............................33
12.6Glossary................................................................33
13Mechanical,Packaging,andOrderable
Information...........................................................33
4RevisionHistory
NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion.
ChangesfromOriginal(September2010)toRevisionAPage
•AddedDeviceInformationtable,ESDRatingstable,RecommendedOperatingConditionstable,Switching
Characteristicstable,FunctionalBlockDiagramsection,FeatureDescriptionsection,DeviceFunctionalModes
section,Programmingsection,ApplicationandImplementationsection,PowerSupplyRecommendationssection,
Layoutsection,DeviceandDocumentationSupportsection,andMechanical,Packaging,andOrderableInformation
section...................................................................................................................................................................................1
•Changeddocumenttitle..........................................................................................................................................................1
•ChangedQFNtoWQFNthroughoutdocument.....................................................................................................................1
•AddedHighresolution,highthroughput:Featuresbullet.......................................................................................................1
•ChangedtemperaturerangeFeaturesbulletfromFullySpecifiedfromtoExtendedtemperaturerange.............................1
•ChangedDescriptionsectionforclarityandchangedADCwithaninherentsample-and-hold(S/H)inputstagetoADC....1
•Changedpage1figureandaddedtitle..................................................................................................................................1
•ChangedtitleofFamilyandOrderingInformationtoDeviceComparisonTable...................................................................4
•ChangedthermalsymbolsforR
θJA
,R
θJC(top)
,R
θJB
,andR
θJC(bot)
.............................................................................................6
•DeletedFull-scaleinputspan,Absoluteinputrange,ExternalReference,AVDD,andDVDDparametersand
TemperatureRangesectionfromElectricalCharacteristics:ADS7947(12-Bit)table...........................................................6
•DeletedFull-scaleinputspan,Absoluteinputrange,ExternalReference,AVDD,andDVDDparametersand
TemperatureRangesectionfromElectricalCharacteristics:ADS7948(10-Bit)table..........................................................8
•DeletedFull-scaleinputspan,Absoluteinputrange,ExternalReference,AVDD,andDVDDparametersand
TemperatureRangesectionfromElectricalCharacteristics:ADS7949(8-Bit)table..........................................................10
•ChangedTimingRequirementstable:addedsectiontitles,movedswitchingparametersintoSwitching
Characteristicstable............................................................................................................................................................11
•ChangedsymbolforPulseduration,SCLKlowparameterfromt
W1
tot
WL
..........................................................................11
•AddedsymboltoSCLKfrequencyparameter......................................................................................................................11
•ChangedtitleofPCBLayout/SchematicGuidelinestoLayoutandchangedformatofsection...........................................31
3
ADS7947
,
ADS7948
,
ADS7949
www.ti.com
SLAS708A–SEPTEMBER2010–REVISEDSEPTEMBER2019
ProductFolderLinks:ADS7947ADS7948ADS7949
SubmitDocumentationFeedbackCopyright©2010–2019,TexasInstrumentsIncorporated
RevisionHistory(continued)
•ChangedRecommendedADCSchematicfigure.................................................................................................................31
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS7948 |
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