Texas Instruments ADS7822 Handleiding
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ADS7822
ADS7822
1
FEATURES
DESCRIPTION
APPLICATIONS
SAR
Control
Serial
Interface
D
OUT
Comparator
S/HAmp
CS/SHDN
DCLOCK
+In
V
REF
-In
CDAC
ADS7822
SBAS062C–JANUARY1996–REVISEDAUGUST2007
12-Bit,200kHz,microPowerSampling
ANALOG-TO-DIGITALCONVERTER
2
•200kHzSamplingRate
•microPower:
TheADS7822isa12-bitsamplinganalog-to-digital
(A/D)converterwithensuredspecificationsovera
1.6mWat200kHz
2.7Vto5.25Vsupplyrange.Itrequiresverylittle
0.54mWat75kHz
powerevenwhenoperatingatthefull200kHzrate.At
0.06mWat7.5kHz
lowerconversionrates,thehighspeedofthedevice
•PowerDown:3μAmax
enablesittospendmostofitstimeinthe
•Mini-DIP-8,SO-8,andMSOP-8Packages
power-downmode—thepowerdissipationisless
than60μWat7.5kHz.
•Pseudo-DifferentialInput
•SerialInterface
TheADS7822alsofeaturesoperationfrom2.0Vto
5V,asynchronousserialinterface,anda
pseudo-differentialinput.Thereferencevoltagecan
besettoanylevelwithintherangeof50mVtoV
CC
.
•Battery-OperatedSystems
UltralowpowerandsmallsizemaketheADS7822
•RemoteDataAcquisition
idealforbattery-operatedsystems.Itisalsoaperfect
•IsolatedDataAcquisition
fitforremotedata-acquisitionmodules,simultaneous
•SimultaneousSampling,MultichannelSystems
multichannelsystems,andisolateddataacquisition.
TheADS7822isavailableinaplasticmini-DIP-8,an
SO-8,oranMSOP-8package.
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©1996–2007,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
www.ti.com
ABSOLUTEMAXIMUMRATINGS
(1)
ADS7822
SBAS062C–JANUARY1996–REVISEDAUGUST2007
ThisintegratedcircuitcanbedamagedbyESD.TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwith
appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore
susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
ORDERINGINFORMATION
(1)
MAXIMUMMAXIMUM
INTEGRALDIFFERENTIALSPECIFIEDTRANSPORT
PACKAGE-PACKAGEPACKAGEORDERING
PRODUCTLINEARITYLINEARITYTEMPERATUREMEDIA,
LEADDESIGNATORMARKING
(2)
NUMBER
ERRORERRORRANGEQUANTITY
(LSB)(LSB)
TapeandReel,
ADS7822E/250
250
ADS7822E±2±2MSOP-8DGK–40°Cto+85°CA22
TapeandReel,
ADS7822E/2K5
2500
TapeandReel,
ADS7822EB/250
250
ADS7822EB±1±1MSOP-8DGK–40°Cto+85°CA22
TapeandReel,
ADS7822EB/2K5
2500
TapeandReel,
ADS7822EC/250
250
ADS7822EC±0.75±0.75MSOP-8DGK–40°Cto+85°CA22
TapeandReel,
ADS7822EC/2K5
2500
Plastic
ADS7822P±2±2P–40°Cto+85°CADS7822PADS7822PRails,50
DIP-8
Plastic
ADS7822PB±1±1P–40°Cto+85°CADS7822PBADS7822PBRails,50
DIP-8
Plastic
ADS7822PC±0.75±0.75P–40°Cto+85°CADS7822PCADS7822PCRails,50
DIP-8
ADS7822URails,100
ADS7822U±2±2SO-8D–40°Cto+85°CADS7822U
TapeandReel,
ADS7822U/2K5
2500
ADS7822UBRails,100
ADS7822UB±1±1SO-8D–40°Cto+85°CADS7822UB
TapeandReel,
ADS7822UB/2K5
2500
ADS7822UCRails,100
ADS7822UC±0.75±0.75SO-8D–40°Cto+85°CADS7822UC
TapeandReel,
ADS7822UC/2K5
2500
(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumlocatedattheendofthisdatasheet,orsee
theTIwebsiteatwww.ti.com.
(2)Performancegradeinformationismarkedonthereel.
overoperatingfree-airtemperaturerange(unlessotherwisenoted)
ADS7822UNIT
V
CC
+6V
Analoginput–0.3toV
CC
+0.3V
Logicinput–0.3to6V
Casetemperature+100°C
Junctiontemperature+150°C
Storagetemperature+125°C
Externalreferencevoltage+5.5V
(1)StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratings
only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommendedOperating
Conditionsisnotimplied.Exposuretoabsolute-maximumratedconditionsforextendedperiodsmayaffectdevicereliability.
2SubmitDocumentationFeedbackCopyright©1996–2007,TexasInstrumentsIncorporated
ProductFolderLink(s):ADS7822
www.ti.com
ELECTRICALCHARACTERISTICS:+V
CC
=+2.7V
ADS7822
SBAS062C–JANUARY1996–REVISEDAUGUST2007
At–40°Cto+85°C,+V
CC
=+2.7V,V
REF
=+2.5V,f
SAMPLE
=75kHz,andf
CLK
=16×f
SAMPLE
,unlessotherwisenoted.
ADS7822ADS7822BADS7822C
PARAMETERTESTCONDITIONSUNIT
MINTYPMAXMINTYPMAXMINTYPMAX
ANALOGINPUT
Full-scaleinputspan+In–(–In)0V
REF
0V
REF
0V
REF
V
+In–GND–0.2V
CC
+0.2–0.2V
CC
+0.2–0.2V
CC
+0.2V
Absoluteinputrange
–In–GND–0.2+1.0–0.2+1.0–0.2+1.0V
Capacitance252525pF
Leakagecurrent±1±1±1μA
SYSTEMPERFORMANCE
Resolution121212Bits
Nomissingcodes111211Bits
Integrallinearityerror–2±0.5+2–1±0.5+1–0.75±0.25+0.75LSB
(1)
Differentiallinearityerror–2±0.5+2–1±0.5+1–0.75±0.25+0.75LSB
Offseterror–3+3–3+3–1+1LSB
Gainerror–3+3–3+3–1+1LSB
Noise333333μVrms
Power-supplyrejection828282dB
SAMPLINGDYNAMICS
Conversiontime121212ClkCycles
Acquisitiontime1.51.51.5ClkCycles
Throughputrate757575kHz
DYNAMICCHARACTERISTICS
TotalharmonicdistortionV
IN
=2.5V
PP
at1kHz–82–82–82dB
SINADV
IN
=2.5V
PP
at1kHz717171dB
Spurious-freedynamicrangeV
IN
=2.5V
PP
at1kHz868686dB
REFERENCEOUTPUT
Voltagerange0.05V
CC
0.05V
CC
0.05V
CC
V
CS=GND,f
SAMPLE
=0Hz555GΩ
Resistance
CS=V
CC
555GΩ
Atcode710h840840840μA
Currentdrainf
SAMPLE
=7.5kHz0.80.80.8μA
CS=V
CC
0.00130.00130.0013μA
DIGITALINPUT/OUTPUT
LogicfamilyCMOSCMOSCMOS
V
IH
I
IH
=+5μA2.05.52.05.52.05.5V
V
IL
I
IL
=+5μA–0.30.8–0.30.8–0.30.8V
Logiclevels
V
OH
I
OH
=–250μA2.12.12.1V
V
OL
I
OL
=250μA0.40.40.4V
DataformatStraightBinaryStraightBinaryStraightBinary
POWER-SUPPLYREQUIREMENTS
Specifiedperformance2.73.62.73.62.73.6V
V
CC
SeeNotes
(2)
and
(3)
2.02.72.02.72.02.7V
SeeNote
(3)
2.73.62.73.62.73.6V
f
SAMPLE
=7.5kHz
(4)(5)
202020μA
Quienscentcurrent
f
SAMPLE
=75kHz
(5)
200325200325200325μA
PowerdownCS=V
CC
333μA
TEMPERATURERANGE
Specifiedperformance–40+85–40+85–40+85°C
(1)LSBmeansleastsignificantbit.WithV
REF
equalto+2.5V,oneLSBis0.61mV.
(2)ThemaximumclockrateoftheADS7822islessthan1.2MHzinthispower-supplyrange.
(3)SeetheTypicalCharacteristicsformoreinformation.
(4)f
CLK
=1.2MHz,CS=V
CC
for145clockcyclesoutofevery160.
(5)SeethePowerDissipationsectionformoreinformationregardinglowersamplerates.
Copyright©1996–2007,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3
ProductFolderLink(s):ADS7822
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS7822 |
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