Texas Instruments ADS8506 Handleiding
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1
FEATURESAPPLICATIONS
DESCRIPTION
Successive Approximation Register
Clock
Comparator
CS
CDAC
Buffer
REF
CAP
R1
IN
40 kΩ
9.9 kΩ
Internal
+2.5 V Ref
6 kΩ
Parallel
and
Serial
Data
Out
&
Control
BUSYBUSY
DATACLK
TAG
20 kΩ
39.8 kΩ
R2
IN
EXT/IN
R/C
SB/BTC
BYTE
REFD
Parallel
Data
PWRD
SDATA
ADS8506
SLAS484B–SEPTEMBER2007–REVISEDDECEMBER2007
12-BIT40-KSPSLOWPOWERSAMPLINGANALOG-TO-DIGITALCONVERTERWITH
INTERNALREFERENCEANDPARALLEL/SERIALINTERFACE
•IndustrialProcessControl
2
•40-kHzMinSamplingRate
•TestEquipment
•4-V,5-V,and±10-VInputRanges
•MedicalEquipment
•73.9-dBSINADwith10-kHzInput
•DataAcquisitionSystems
•±0.45LSBMaxINL
•DigitalSignalProcessing
•±0.45LSBMaxDNL,12-BitNoMissingCodes
•Instrumentation
•±5-mVBPZ,±0.5PPM/°CBPZDrift
•SPICompatibleSerialOutputWith
Daisy-Chain(TAG),SPIMaster/SlaveFeature
TheADS8506isacompletelowpower,single5-V
•Single5-VAnalogSupply
supply,12-bitsamplinganalog-to-digital(A/D)
•Pin-CompatibleWithADS7806and16-Bit
converter.Itcontainsacomplete12-bit
ADS7807/8507
capacitor-based,successiveapproximationregister
(SAR)A/Dconverterwithsampleandhold,clock,
•UsesInternalorExternal2.5-VReference
reference,anddatainterface.Theconvertercanbe
•LowPowerDissipation
configuredforavarietyofinputrangesincluding±10
–24mWTyp,30mWMaxat40KSPS
V,4V,and5V.Formostinputranges,theinput
voltagecanswingto25Vor–25Vwithoutdamage
•50-µWMaxPowerDownMode
totheconverter.
•28-PinSOPackage
ASPIcompatibleserialinterfaceallowsdatatobe
•FullParallelInterface
synchronizedtoaninternalorexternalclock.Afull
•2'sComporBTCOutputCode
parallelinterfacewithBYTEselectisalsoprovidedto
allowthemaximumsystemdesignflexibility.The
ADS8506isspecifiedat40kHzsamplingrateover
theindustrial-40°Cto85°Ctemperaturerange.
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2QSPI,SPIaretrademarksofMotorola.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2007,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
www.ti.com
ABSOLUTEMAXIMUMRATINGS
ELECTRICALCHARACTERISTICS
ADS8506
SLAS484B–SEPTEMBER2007–REVISEDDECEMBER2007
Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam
duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
PACKAGE/ORDERINGINFORMATION
(1)
FULL-
MINIMUMNOSPECIFICATION
SCALEPACKAGEPACKAGEORDERINGTRANSPORT
PRODUCTINLMISSINGTEMPERATURE
ERRORLEADDESIGNATORNUMBERMEDIA,QTY
(LSB)CODERANGE
(%)
ADS8506IBDWTube,20
ADS8506IB±0.4512±0.25-40°Cto85°CSO-28DW
ADS8506IBDWRTapeandReel,1000
ADS8506IDWTube,20
ADS8506I±0.912±0.5-40°Cto85°CSO-28DW
ADS8506IDWRTapeandReel,1000
(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTI
websiteatwww.ti.com.
overoperatingfree-airtemperaturerange(unlessotherwisenoted)
(1)
UNIT
R1
IN
±25V
AnaloginputsR2
IN
±25V
REF+V
ANA
+0.3VtoAGND2-0.3V
DGND,AGND2±0.3V
V
ANA
6V
Groundvoltagedifferences
V
DIG
toV
ANA
0.3V
V
DIG
6V
Digitalinputs-0.3Vto+V
DIG
+0.3V
Maximumjunctiontemperature165°C
Storagetemperaturerange–65°Cto150°C
Internalpowerdissipation700mW
Leadtemperature(soldering,1.6mmfromcase10seconds)260°C
(1)Allvoltagevaluesarewithrespecttonetworkgroundterminal.
AtT
A
=-40°Cto85°C,f
S
=40kHz,V
DIG
=V
ANA
=5V,andusinginternalreferenceandfixedresistors,(seeFigure43)unless
otherwisespecified.
ADS8506IBADS8506I
PARAMETERTESTCONDITIONSUNIT
MINTYPMAXMINTYPMAX
Resolution1212Bits
ANALOGINPUT
-1010-1010
VoltagerangesSeeTable10505V
0404
Impedance
Capacitance4545pF
THROUGHPUTSPEED
Conversiontime1515µs
CompletecycleAcquireandconvert2525
Throughputrate40kHz
DCACCURACY
INLIntegrallinearityerror-0.45±0.150.45-0.9±0.150.9LSB
(1)
(1)LSBmeansLeastSignificantBit.OneLSBforthe±10-Vinputrangeis305µV.
2SubmitDocumentationFeedbackCopyright©2007,TexasInstrumentsIncorporated
ProductFolderLink(s):ADS8506
www.ti.com
ADS8506
SLAS484B–SEPTEMBER2007–REVISEDDECEMBER2007
ELECTRICALCHARACTERISTICS(continued)
AtT
A
=-40°Cto85°C,f
S
=40kHz,V
DIG
=V
ANA
=5V,andusinginternalreferenceandfixedresistors,(seeFigure43)unless
otherwisespecified.
ADS8506IBADS8506I
PARAMETERTESTCONDITIONSUNIT
MINTYPMAXMINTYPMAX
DNLDifferentiallinearityerror-0.45±0.150.45-0.9±0.150.9LSB
Nomissingcodes1212Bits
Transitionnoise
(2)
0.10.1LSB
GainError±0.1±0.2%
Fullscaleerror
(3)(4)
-0.250.25-0.50.5%
Fullscaleerrordrift±5±7ppm/°C
Fullscaleerror
(3)(4)
Ext.2.5-VRef-0.250.25-0.50.5%
FullscaleerrordriftExt.2.5-VRef±0.5±0.5ppm/°C
Bipolarzeroerror
(3)
±10VRange-1010-1010mV
Bipolarzeroerrordrift±10VRange±0.5±0.5ppm/°C
Unipolarzeroerror
(3)
0Vto5V,0Vto4VRanges-33-33mV
Unipolarzeroerrordrift0Vto5V,0Vto4VRanges±0.5±0.5ppm/°C
Recoverytimetoratedaccuracy1
2.2-µFCapacitortoCAP1ms
frompowerdown
(5)
Powersupplysensitivity
+4.75V<V
S
<+5.25V±0.5±0.5LSB
(V
DIG
=V
ANA
=V
S
)
ACACCURACY
SFDRSpurious-freedynamicrangef
IN
=10kHz,±10V80988098dB
(6)
THDTotalharmonicdistortionf
IN
=10kHz,±10V-96-80-96-80dB
f
IN
=10kHz,±10V7273.97073.9
SINADSignal-to-(noise+distortion)dB
-60dBInput3232
SNRSignal-to-noise72747074dB
Usablebandwidth
(7)
f
IN
=10kHz,±10V130130kHz
Full-powerbandwidth(-3dB)600600kHz
SAMPLINGDYNAMICS
Aperturedelay4040ns
Aperturejitter2020ps
TransientresponseFSStep55µs
Overvoltagerecovery
(8)
750750ns
REFERENCE
InternalreferencevoltageNoload2.482.52.522.482.52.52V
Internalreferencesourcecurrent1
1µA
(mustuseexternalbuffer)
Internalreferencedrift88ppm/°C
Externalreferencevoltagerange
2.32.52.72.32.52.7V
forspecifiedlinearity
ExternalreferencecurrentdrainExt.2.5-VRef100100µA
DIGITALINPUTS
V
IL
Low-levelinputvoltage-0.3+0.8-0.3+0.8V
V
IH
High-levelinputvoltage2.0V
D
+0.3V2.0V
D
+0.3VV
I
IL
Low-levelinputcurrentV
IL
=0V±10±10µA
I
IH
High-levelinputcurrentV
IH
=5V±10±10µA
DIGITALOUTPUTS
(2)Typicalrmsnoiseatworstcasetransitions.
(3)Asmeasuredwithfixedresistors,seeFigure43.Adjustabletozerowithexternalpotentiometer.
(4)Fullscaleerroristheworstcaseof-FullScaleor+FullScaleuntrimmeddeviationfromidealfirstandlastcodetransitions,dividedby
thetransitionvoltage(notdividedbythefull-scalerange)andincludestheeffectofoffseterror.
(5)ThisisthetimedelayaftertheADS8506isbroughtoutofPower-Downmodeuntilallinternalsettlingoccursandtheanaloginputis
acquiredtoratedaccuracy.AConvertcommandafterthisdelaywillyieldaccurateresults.
(6)AllspecificationsindBarereferredtoafull-scaleinput.
(7)Usablebandwidthdefinedasfull-scaleinputfrequencyatwhichSignal-to-(Noise+Distortion)degradesto60dB.
(8)Recoverstospecifiedperformanceafter2xFSinputovervoltage.
Copyright©2007,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3
ProductFolderLink(s):ADS8506
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS8506 |
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