Texas Instruments ADS8688 Handleiding
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-0.05
-0.03
-0.01
0.01
0.03
0.05
±40 ±7
265992125
Gain (%FS)
Free-Air Temperature (
o
C)
C026
-----± 2.5*V
REF
----- ± 1.25*V
REF
----- ± 0.625*V
REF
------ +2.5*V
REF
------+1.25*V
REF
Multiplexer
Oscillator
CS
SCLK
SDI
SDO
DAISY
REFSEL
RST / PD
REFCAP
REFIO
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B0
AIN_0P
AIN_0GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B1
AIN_1P
AIN_1GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B2
AIN_2P
AIN_2GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B3
AIN_3P
AIN_3GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B4
AIN_4P
AIN_4GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B5
AIN_5P
AIN_5GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B6
AIN_6P
AIN_6GND
OVP
PGA
1 M:
OVP
1 M:
2nd-Order
LPF
ADC
Driver
V
B7
AIN_7P
AIN_7GND
OVP
AUX_IN
AUX_GND
16-bit
SAR ADC
Digital
Logic
&
Interface
4.096V
Reference
REFGND
DGNDAGND
DVDD
AVDD
Additional Channels in ADS8688
ADS8688
ADS8684
Product
Folder
Sample &
Buy
Technical
Documents
Tools &
Software
Support &
Community
Reference
Design
ADS8684
,
ADS8688
SBAS582C–JULY2014–REVISEDAPRIL2015
ADS868x16-Bit,500-kSPS,4-and8-Channel,Single-Supply,SARADCswith
BipolarInputRanges
1Features2Applications
1
•16-BitADCswithIntegratedAnalogFront-End
•PowerAutomation
•4-,8-ChannelMUXwithAutoandManualScan•ProtectionRelays
•Channel-IndependentProgrammableInput•PLCAnalogInputModules
Ranges:
3Description
–Bipolar:±10.24V,±5.12V,±2.56V
TheADS8684andADS8688are4-and8-channel,
–Unipolar:10.24V,5.12V
integrateddataacquisitionsystemsbasedona16-bit
•5-VAnalogSupply:1.65-Vto5-VI/OSupply
successiveapproximation(SAR)analog-to-digital
•ConstantResistiveInputImpedance:1MΩ
converter(ADC),operatingatathroughputof
500-kSPS.Thedevicesfeatureintegratedanalog
•InputOvervoltageProtection:Upto±20V
front-endcircuitryforeachinputchannelwith
•On-Chip,4.096-VReferencewithLowDrift
overvoltageprotectionupto±20V,a4-or8-channel
•ExcellentPerformance:
multiplexerwithautomaticandmanualscanning
modes,andanon-chip,4.096-Vreferencewithlow
–500-kSPSAggregateThroughput
temperaturedrift.Operatingonasingle5-Vanalog
–DNL:±0.5LSB;INL:±0.75LSB
supply,eachinputchannelonthedevicescan
–LowDriftforGainErrorandOffset
supporttruebipolarinputrangesof±10.24V,
±5.12V,and±2.56V,aswellasunipolarinput
–SNR:92dB;THD:–102dB
rangesof0Vto10.24Vand0Vto5.12V.Thegain
–LowPower:65mW
oftheanalogfront-endforallinputrangesis
•AUXInput→DirectConnectiontoADCInputs
accuratelytrimmedtoensureahighdcprecision.The
•SPI™-CompatibleInterfacewithDaisy-Chain
inputrangeselectionissoftware-programmableand
independentforeachchannel.Thedevicesoffera
•IndustrialTemperatureRange:–40°Cto125°C
1-MΩconstantresistiveinputimpedanceirrespective
•TSSOP-38Package(9.7mm×4.4mm)
oftheselectedinputrange.
SimplifiedBlockDiagram
TheADS8684andADS8688offerasimpleSPI-
compatibleserialinterfacetothedigitalhostandalso
supportdaisy-chainingofmultipledevices.Thedigital
supplyoperatesfrom1.65Vto5.25V,enabling
directinterfacetoawiderangeofhostcontrollers.
DeviceInformation
(1)
PARTNUMBERPACKAGEBODYSIZE(NOM)
ADS868xTSSOP(38)9.70mm×4.40mm
(1)Forallavailablepackages,seetheorderableaddendumat
theendofthedatasheet.
GainErrorversusTemperature
1
AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
ADS8684
,
ADS8688
SBAS582C–JULY2014–REVISEDAPRIL2015
www.ti.com
TableofContents
8.3FeatureDescription.................................................22
1Features..................................................................1
8.4DeviceFunctionalModes........................................32
2Applications...........................................................1
8.5RegisterMaps.........................................................45
3Description.............................................................1
9ApplicationandImplementation........................52
4RevisionHistory.....................................................2
9.1ApplicationInformation............................................52
5DeviceComparisonTable.....................................4
9.2TypicalApplications................................................52
6PinConfigurationandFunctions.........................4
10Power-SupplyRecommendations.....................57
7Specifications.........................................................6
11Layout...................................................................57
7.1AbsoluteMaximumRatings......................................6
11.1LayoutGuidelines.................................................57
7.2ESDRatings..............................................................6
11.2LayoutExample....................................................58
7.3RecommendedOperatingConditions.......................6
12DeviceandDocumentationSupport.................59
7.4ThermalInformation..................................................6
12.1DocumentationSupport........................................59
7.5ElectricalCharacteristics...........................................7
12.2RelatedLinks........................................................59
7.6TimingRequirements:SerialInterface....................11
12.3Trademarks...........................................................59
7.7TypicalCharacteristics............................................12
12.4ElectrostaticDischargeCaution............................59
8DetailedDescription............................................21
12.5Glossary................................................................59
8.1Overview.................................................................21
13Mechanical,Packaging,andOrderable
8.2FunctionalBlockDiagram.......................................21
Information...........................................................59
4RevisionHistory
NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion.
ChangesfromRevisionB(August2014)toRevisionCPage
•Changedunipolarsub-bulletofthirdFeaturesbullet..............................................................................................................1
•Addedtitletopage1blockdiagram......................................................................................................................................1
•DeletedfootnotefromDeviceComparisontable...................................................................................................................4
•UpdatedESDRatingstabletocurrentstandards.................................................................................................................6
•CorrectedpackagenameinThermalInformationtable........................................................................................................6
•ChangedAuxiliaryChannel,SINADandSFDRtypicalspecificationsinElectricalCharacteristicstable.............................9
•Changedt
DZ_CSDO
symbolinTimingRequirementstableandFigure1................................................................................11
•DeletedclampfromsecondsentenceofOverviewsection................................................................................................21
•ChangedvoltagerangevaluesinsecondparagraphofAnalogInputssection..................................................................22
•ChangedRange_CHn[2:0]toRange_CHn[3:0]inProgrammableGainAmplifier(PGA)section........................................25
•AddedBit3columntoTable3............................................................................................................................................25
•ChangedSDOtoSDIinsecondsentenceofEvent3inDataAcquisitionExamplesection..............................................34
•ChangedContinuedOperationintheSelectedModesection.............................................................................................37
•ChangedFrameAbortConditionsection.............................................................................................................................38
•ChangedSTANDBYModesection:addedclarificationtodescriptionofSTANDBYmode.................................................38
•ChangedsecondparagraphofPower-DownModesection:addedclarificationtodescriptionofPWR_DNmode...........40
•ChangedfirsttwoparagraphsofAutoChannelEnablewithResetsection.........................................................................41
•ChangedfirstparagraphofManualChannelnSelectsection............................................................................................42
•ChangedsecondparagraphofResetProgramRegisterssection:addedclaritytodescriptionofRSTmode..................44
•ChangedProgramRegisterDescriptionsection.................................................................................................................45
ChangesfromRevisionA(July2014)toRevisionBPage
•Madechangestoproductpreviewdatasheet,releasedtoProductionData.........................................................................1
2SubmitDocumentationFeedbackCopyright©2014–2015,TexasInstrumentsIncorporated
ProductFolderLinks:ADS8684ADS8688
ADS8684
,
ADS8688
www.ti.com
SBAS582C–JULY2014–REVISEDAPRIL2015
ChangesfromOriginal(July2014)toRevisionAPage
•Madechangestoproductpreviewdatasheet........................................................................................................................1
Copyright©2014–2015,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3
ProductFolderLinks:ADS8684ADS8688
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS8688 |
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