Texas Instruments ADS8481 Handleiding
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FEATURESAPPLICATIONS
DESCRIPTION
CDAC
_
+
Output
Latches
and
3-State
Drivers
BYTE
16-/8-Bit
Parallel DATA
Output Bus
SAR
Conversion
and
Control Logic
Comparator
Clock
+IN
−IN
REFIN
CONVST
BUSY
CS
RD
4.096-V
Internal
Reference
REFOUT
BUS 18/16
ADS8481
SLAS385A–FEBRUARY2006–REVISEDMARCH2006
18-BIT,1-MSPS,PSEUDO-DIFFERENTIALUNIPOLARINPUT,MICROPOWERSAMPLING
ANALOG-TO-DIGITALCONVERTERWITHPARALLELINTERFACEANDREFERENCE
•MedicalInstruments
•0to1MSPSSamplingRate
•OpticalNetworking
•18-BitNMCEnsuredOverTemperature
•TransducerInterface
•Low±0.1mVOffsetError
•HighAccuracyDataAcquisitionSystems
•Low0.2ppm/°COffsetErrorTemperature
•Magnetometers
Drift
•Low0.6ppm/°CGainErrorTemperatureDrift
•ZeroLatency
TheADS8481isan18-bit,1-MSPSA/Dconverter
•LowPower:220mWat1MSPS
withaninternal4.096-Vreferenceanda
•UnipolarSingle-EndedInputRange:0Vto
pseudo-differentialunipolarsingle-endedinput.The
V
ref
deviceincludesa18-bitcapacitor-basedSARA/D
converterwithinherentsampleandhold.The
•OnboardReference
ADS8481offersafull18-bitinterface,a16-bitoption
•OnboardReferenceBuffer
wheredataisreadusingtworeadcycles,oran8-bit
•High-SpeedParallelInterface
busoptionusingthreereadcycles.
•WideDigitalSupply2.7V~5.25V
TheADS8481isavailableina7x7QFNpackage
•8-/16-/18-BitBusTransfer
andischaracterizedovertheindustrial–40°Cto
85°Ctemperaturerange.
•7x7QFNPackage
HIGHSPEEDSARCONVERTERFAMILY
TYPE/SPEED500kHz580kHz750kHz1MHz1.25MHz2MHz3MHz4MHz
ADS8383ADS8381ADS8481
18-BitPseudo-Diff
ADS8380(S)
18-BitPseudo-Bipolar,FullyDiffADS8382(S)ADS8482
ADS8371ADS8471ADS8401ADS8411
16-BitPseudo-Diff
ADS8405
ADS8472ADS8402ADS8412
16-BitPseudo-Bipolar,FullyDiff
ADS8406
14-BitPseudo-DiffADS7890(s)ADS7891
12-BitPseudo-DiffADS7886ADS7883ADS7881
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas
Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2006,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
www.ti.com
ABSOLUTEMAXIMUMRATINGS
(1)
ADS8481
SLAS385A–FEBRUARY2006–REVISEDMARCH2006
Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam
duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
ORDERINGINFORMATION
(1)
MAXIMUMMAXIMUMNOMISSINGTRANS-
TEMPER-
INTEGRALDIFFERENTIALCODESPACKAGEPACKAGEORDERINGPORT
MODELATURE
LINEARITYLINEARITY(LSB)RESOLUTIONTYPEDESIGNATORINFORMATIONMEDIA
RANGE
(LSB)(BIT)QTY.
ADS8482IRGZTTapeand
reel250
7x748Pin–40°Cto
ADS8481I±5–1to+2.518RGZ
QFN85°C
ADS8481IRGZRTapeand
reel1000
ADS8481IBRGZTTapeand
reel250
7x748Pin–40°Cto
ADS8481IB±3.5–1to+1.518RGZ
QFN85°C
ADS8481IBRGZRTapeand
reel1000
(1)Forthemostcurrentspecificationsandpackageinformation,refertoourwebsiteatwww.ti.com.
overoperatingfree-airtemperaturerange(unlessotherwisenoted)
VALUEUNIT
+INtoAGND–0.4to+VA+0.1V
–INtoAGND–0.4to0.5V
Voltage+VAtoAGND–0.3to7V
+VBDtoBDGND–0.3to7V
+VAto+VBD–0.3to2.55V
DigitalinputvoltagetoBDGND–0.3to+VBD+0.3V
DigitaloutputvoltagetoBDGND–0.3to+VBD+0.3V
T
A
Operatingfree-airtemperaturerange–40to85°C
T
stg
Storagetemperaturerange–65to150°C
Junctiontemperature(T
J
max)150°C
Powerdissipation(T
J
Max–T
A
)/θ
JA
QFNpackage
θ
JA
thermalimpedance22°C/W
Vaporphase(60sec)215°C
Leadtemperature,soldering
Infrared(15sec)220°C
(1)Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratings
only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperating
conditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
2
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SPECIFICATIONS
ADS8481
SLAS385A–FEBRUARY2006–REVISEDMARCH2006
T
A
=–40°Cto85°C,+VA=5V,+VBD=3Vor5V,V
ref
=4.096V,f
SAMPLE
=1MSPS(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
ANALOGINPUT
Full-scaleinputvoltage
(1)
+IN–(–IN)0V
ref
V
+IN–0.2V
ref
+0.2
AbsoluteinputvoltageV
–IN–0.20.2
Inputcapacitance65pF
Inputleakagecurrent1nA
SYSTEMPERFORMANCE
Resolution18Bits
ADS8481I1818
NomissingcodesBits
ADS8481IB18
ADS8481I–5–1.5/+1.95
LSB
Integrallinearity
(2)(3)
(18bit)
ADS8481IB–3.5–1.5/+1.93.5
ADS8481I–1–0.5/+0.72.5
LSB
Differentiallinearity
(18bit)
ADS8481IB–1–0.5/+0.71.5
ADS8481I–0.5±0.10.5
Offseterror
(4)
mV
ADS8481IB–0.5±0.10.5
Offseterrortemperaturedrift±0.2ppm/°C
ADS8481IV
ref
=4.096V–0.075±0.050.075%FS
Gainerror
(4)(5)
ADS8481IBV
ref
=4.096V–0.075±0.050.075%FS
Gainerrortemperaturedrift±0.6ppm/°C
Noise30µVRMS
PowersupplyrejectionratioAt3FFFFhoutputcode60dB
SAMPLINGDYNAMICS
Conversiontime650710ns
Acquisitiontime250ns
Throughputrate1MHz
Aperturedelay4ns
Aperturejitter5ps
Stepresponse150ns
Overvoltagerecovery150ns
(1)Idealinputspan,doesnotincludegainoroffseterror.
(2)LSBmeansleastsignificantbit
(3)ThisisendpointINL,notbestfit.
(4)Measuredrelativetoanidealfull-scaleinput[+IN–(–IN)]of4.096V
(5)Thisspecificationdoesnotincludetheinternalreferencevoltageerroranddrift.
3
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Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS8481 |
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