Texas Instruments ADS8505 Handleiding
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FEATURESAPPLICATIONS
DESCRIPTION
SuccessiveApproximationRegisterandControlLogic
Clock
BUSY
Comparator
BYTE
CS
R/C
CDAC
Buffer
REF
CAP
±10VInput
5kΩ
2k
Ω
9.8kΩ
Internal
+2.5VRef
4kΩ
Output
Latches
and
Three
State
Drivers
Three
State
Parallel
Data
Bus
ADS8505
SLAS180B–SEPTEMBER2005–REVISEDJUNE2007
16-BIT250-KSPSSAMPLINGCMOSANALOG-TO-DIGITALCONVERTER
•IndustrialProcessControl
•105dBSFDRat250-kHzSampleRate
•DataAcquisitionSystems
•Standard±10-VInputRange
•DigitalSignalProcessing
•±1.5LSBMaxINL
•MedicalEquipment
•±1LSBMaxDNL,16-BitsNoMissingCodes
•Instrumentation
•±2mVMaxBipolarZeroErrorWith±0.4
PPM/°CDrift
•±0.1%FSRMaxFull-ScaleErrorWith±2
TheADS8505isacomplete16-bitsamplingA/D
PPM/°CDrift
converterusingstate-of-the-artCMOSstructures.It
•Single5-VSupplyOperation
containsacomplete16-bit,capacitor-based,SAR
•Pin-CompatibleWithADS7805(LowSpeed)
A/DwithS/H,reference,clock,interfacefor
and12-BitADS8504/7804
microprocessoruse,and3-stateoutputdrivers.
•UsesInternalorExternalReference
TheADS8505isspecifiedata250-kHzsampling
•FullParallelDataOutputrateoverthefulltemperaturerange.Precision
resistorsprovideanindustrystandard±10-Vinput
•70-mWTypPowerDissipationat250KSPS
range,whiletheinnovativedesignallowsoperation
•28-PinSSOPandSOICPackages
fromasingle+5-Vsupply,withpowerdissipation
under100mW.
TheADS8505isavailablein28-pinSOICand28-pin
SSOPpackages,bothfullyspecifiedforoperation
overtheindustrial–40°Cto85°Ctemperaturerange.
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas
Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2005–2007,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
www.ti.com
ABSOLUTEMAXIMUMRATINGS
(1)
ELECTRICALCHARACTERISTICS
ADS8505
SLAS180B–SEPTEMBER2005–REVISEDJUNE2007
Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam
duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
PACKAGE/ORDERINGINFORMATION
(1)
MINIMUM
NOMINIMUMSPECIFICATION
RELATIVEPACKAGEPACKAGEORDERINGTRANSPORT
PRODUCTMISSINGSINADTEMPERATURE
ACCURACYLEADDESIGNATORNUMBERMEDIA,QTY
CODE(dB)RANGE
(LSB)
ADS8505IBDWTube,20
SO-28DW
ADS8505IBDWRTapeandReel,1000
ADS8505IB±1.51686–40°Cto85°C
ADS8505IBDBTube,50
SSOP-28DB
ADS8505IBDBRTapeandReel,2000
ADS8505IDWTube,20
SO-28DW
ADS8505IDWRTapeandReel,1000
ADS8505I±41583–40°Cto85°C
ADS8505IDBTube,50
SSOP-28DB
ADS8505IDBRTapeandReel,2000
(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTI
websiteatwww.ti.com.
overoperatingfree-airtemperaturerange(unlessotherwisenoted)
(2)
UNIT
V
IN
±25V
AnaloginputsREF+V
ANA
+0.3VtoAGND2–0.3V
CAPIndefiniteshorttoAGND2,momentaryshorttoV
ANA
DGND,AGND1,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
Internalpowerdissipation825mW
Leadtemperature(soldering,10s)300°C
(1)Stressesbeyondthoselistedunder"absolutemaximumratings"maycausepermanentdamagetothedevice.Thesearestressratings
only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder"recommendedoperating
conditions"isnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)Allvoltagevaluesarewithrespecttonetworkgroundterminal.
T
A
=–40°Cto85°C,f
s
=250kHz,V
DIG
=V
ANA
=5V,usinginternalreference(unlessotherwisenoted)
ADS8505IADS8505IB
PARAMETERTESTCONDITIONSUNIT
MINTYPMAXMINTYPMAX
Resolution1616Bits
ANALOGINPUT
Voltagerange±10±10V
Impedance11.511.5kΩ
Capacitance5050pF
THROUGHPUTSPEED
ConversioncycleAcquireandconvert44µs
Throughputrate250250kHz
2
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ADS8505
SLAS180B–SEPTEMBER2005–REVISEDJUNE2007
ELECTRICALCHARACTERISTICS(continued)
T
A
=–40°Cto85°C,f
s
=250kHz,V
DIG
=V
ANA
=5V,usinginternalreference(unlessotherwisenoted)
ADS8505IADS8505IB
PARAMETERTESTCONDITIONSUNIT
MINTYPMAXMINTYPMAX
DCACCURACY
INLIntegrallinearityerror–44–1.51.5LSB
(1)
DNLDifferentialllinearityerror–22–11LSB
(1)
Nomissingcodes1516Bits
Transitionnoise
(2)
0.770.77LSB
Full-scaleerror
(3)(4)
Int.ref.–0.50.5–0.250.25%FSR
Full-scaleerrordriftInt.ref.±7±7ppm/°C
Full-scaleerror
(3)(4)
Ext.2.5-Vref.–0.250.25–0.1±0.010.1%FSR
Full-scaleerrordriftExt.2.5-Vref.±2±2ppm/°C
Bipolarzeroerror
(3)
–55–22mV
Bipolarzeroerrordrift±0.4±0.4ppm/°C
Powersupplysensitivity–88–88
+4.75V<V
D
<+5.25VLSB
(V
DIG
=V
ANA
=V
D
)
ACACCURACY
SFDRSpuriousfreedynamicrangef
I
=20kHz929896105dB
(5)
THDTotalharmonicdistortionf
I
=20kHz–98–92–103–96dB
f
I
=20kHz83888688dB
SINADSignal-to-(noise+distortion)
–60-dBInput3032dB
SNRSignal-to-noiseratiof
I
=20kHz83888688dB
Full-powerbandwidth
(6)
500500kHz
SAMPLINGDYNAMICS
Aperturedelay55ns
TransientresponseFSStep22µs
Overvoltagerecovery
(7)
150150ns
REFERENCE
Internalreferencevoltage2.482.52.522.482.52.52V
Internalreferencesourcecurrent(must
11µA
useexternalbuffer)
Internalreferencedrift88ppm/°C
Externalreferencevoltagerangefor
2.32.52.72.32.52.7V
specifiedlinearity
ExternalreferencecurrentdrainExt.2.5-Vref.100100µA
DIGITALINPUTS
Logiclevels
V
IL
Low-levelinputvoltage–0.30.8–0.30.8V
V
IH
High-levelinputvoltage2.0V
DIG
+0.3V2.0V
DIG
+0.3VV
I
IL
Low-levelinputcurrent±10±10µA
I
IH
High-levelinputcurrent±10±10µA
DIGITALOUTPUTS
Dataformat(parallel16-bits)
Datacoding(binary2'scomplement)
V
OL
Low-leveloutputvoltageI
SINK
=1.6mA0.40.4V
V
OH
High-leveloutputvoltageI
SOURCE
=500mA44V
Hi-Zstate,
Leakagecurrent±5±5µA
V
OUT
=0VtoV
DIG
OutputcapacitanceHi-Zstate1515pF
(1)LSBmeansleastsignificantbit.Forthe16-bit,±10-VinputADS8505,oneLSBis305µV.
(2)Typicalrmsnoiseatworstcasetransitionsandtemperatures.
(3)AsmeasuredwithfixedresistorsshowninFigure27.Adjustabletozerowithexternalpotentiometer.
(4)Full-scaleerroristheworstcaseof–full-scaleor+full-scaledeviationfromidealfirstandlastcodetransitions,dividedbythetransition
voltage(notdividedbythefull-scalerange)andincludestheeffectofoffseterror.
(5)AllspecificationsindBarereferredtoafull-scale±10-Vinput.
(6)Full-powerbandwidthisdefinedasthefull-scaleinputfrequencyatwhichsignal-to-(noise+distortion)degradesto60dB,or10bitsof
accuracy.
(7)Recoverstospecifiedperformanceafter2xFSinputovervoltage.
3
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Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS8505 |
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