Texas Instruments ADS7946 Handleiding
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SPI
AVDDDVDD
GND
AIN0P
AIN1N
AIN0N
AIN1P
PDEN
SAR
ADC
SCLK
SDO
CS
REFGNDREF
CHSEL
MUX
S/H
ADS7945
SPI
AVDDDVDD
GND
AIN0
AIN1GND
AIN0GND
AIN1
PDEN
SAR
ADC
SCLK
SDO
CS
REFGNDREF
CHSEL
MUX
S/H
ADS7946
ADS7945
ADS7946
www.ti.com
SBAS539B–JUNE2011–REVISEDSEPTEMBER2011
14-Bit,2MSPS,Dual-Channel,Differential/Single-Ended,
Ultralow-PowerAnalog-to-DigitalConverters
CheckforSamples:ADS7945,ADS7946
1
FEATURES
DESCRIPTION
TheADS7945/6are14-bit,2MSPSanalog-to-digital
23
•SampleRate:2MSPS
converters(ADCs),withdifferentialandsingle-ended
•14-Bit,Pin-Compatiblewith8/10/12-bit
inputs,respectively.Thedevicesoperateata2
ADS7947/8/9Family(ADS7946)
MSPSsampleratewithastandard16-clockdata
•OutstandingPerformance:
frame.Thedevicesfeaturebothoutstandingdc
precisionandexcellentdynamicperformance;the
–SNR:84dB(ADS7945)
ADS7946ispin-compatiblewiththe8/10/12-bit
–NoMissingCodes
ADS7947/8/9devices.Thedevicesincludea
–INL:1.5LSB(max)(ADS7945)
two-channelinputmultiplexerandalow-power
successiveapproximationregister(SAR)ADCwith
•LowPower:
aninherentsample-and-hold(S/H)inputstage.
–11.6mWat2MSPSOperation
TheADS7945/6supportawideanalogsupplyrange
–AutoPower-DownatLowerSpeeds:
thatallowsthefull-scaleinputrangetoextendto±5V
–7.2mWat500kSPS
differentialor5Vsingle-ended.AsimpleSPI™,with
–1.4mWat100kSPS
adigitalsupplythatcanoperateaslowas1.65V,
allowsforeasyinterfacingtoawidevarietyofdigital
–0.3mWat20kSPS
controllers.Automaticpower-downcanbeenabled
•WideSupplyRange:
whenoperatingatslowerspeedstodramatically
–Analog:2.7Vto5.25V
reducepowerconsumption.
–Digital:1.65VtoAVDD
Offeredinatiny3mm×3mmQFNpackage,the
•SimpleSerialInterface(SPI)
ADS7945/6arefullyspecifiedovertheextended
temperaturerangeof–40°Cto+125°Candare
•FullySpecifiedfrom–40°Cto+125°C
suitableforawidevarietyofdataacquisition
•TinyFootprint:3mm×3mmQFN
applicationswherehighperformance,lowpower,and
smallpackagesizearekey.
APPLICATIONS
•OpticalNetworking
•MedicalInstrumentation
•Battery-PoweredEquipment
•DataAcquisitionSystems
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas
Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2SPIisatrademarkofMotorola.
3Allothertrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright©2011,TexasInstrumentsIncorporated
ProductsconformtospecificationsperthetermsoftheTexas
Instrumentsstandardwarranty.Productionprocessingdoesnot
necessarilyincludetestingofallparameters.
ADS7945
ADS7946
SBAS539B–JUNE2011–REVISEDSEPTEMBER2011
www.ti.com
Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam
duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
FAMILYANDORDERINGINFORMATION
(1)
PRODUCTRESOLUTION(Bits)INPUT
ADS794514Unipolar,differential
ADS794614Unipolar,single-ended
ADS794712Unipolar,single-ended
ADS794810Unipolar,single-ended
ADS79498Unipolar,single-ended
(1)Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orvisitthe
deviceproductfolderatwww.ti.com.
ABSOLUTEMAXIMUMRATINGS
(1)
Overoperatingfree-airtemperaturerange,unlessotherwisenoted.
VALUEUNIT
AINxPtoGNDorAINxNtoGND(ADS7945)–0.3toAVDD+0.3V
AINxtoGND(ADS7946)–0.3toAVDD+0.3V
AINxGNDtoGND(ADS7946)–0.3to+0.3V
AVDDtoGNDorDVDDtoGND–0.3to7V
DigitalinputvoltagetoGND–0.3toDVDD+0.3V
DigitaloutputtoGND–0.3toDVDD+0.3V
Operatingtemperaturerange–40to+125°C
Storagetemperaturerange–65to+150°C
Humanbodymodel(HBM)2000V
ESDratingsChargeddevicemodel(CDM)500V
Machinemodel(MM)200V
(1)Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratings
only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderelectricalcharacteristicsisnot
implied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
2SubmitDocumentationFeedbackCopyright©2011,TexasInstrumentsIncorporated
ProductFolderLink(s):ADS7945ADS7946
ADS7945
ADS7946
www.ti.com
SBAS539B–JUNE2011–REVISEDSEPTEMBER2011
ELECTRICALCHARACTERISTICS:ADS7945(Differential)
Minimum/maximumspecificationsatT
A
=–40°Cto+125°C,AVDD=2.7Vto5.25V,DVDD=1.65VtoAVDD,input
common-mode=V
REF
/2±0.2,andf
SAMPLE
=2MSPS,unlessotherwisenoted.
TypicalspecificationsatT
A
=+25°C,AVDD=5V,DVDD=1.8V,inputcommon-mode=V
REF
/2±0.2,andf
SAMPLE
=2MSPS.
PARAMETERTESTCONDITIONSMINTYPMAXUNITS
ANALOGINPUT
Full-scaleinputspan
(1)
AINxP–AINxN–V
REF
V
REF
V
AIN0P,AIN1P–0.2AVDD+0.2V
Absoluteinputrange
AIN0N,AIN1N–0.2AVDD+0.2V
Inputcommon-moderange
(2)
(AINxP+AINxN)/2V
REF
/2±0.2V
Inputcapacitance
(3)
32pF
InputleakagecurrentAt+125°C1.5nA
SYSTEMPERFORMANCE
Resolution14Bits
Nomissingcodes14Bits
Integrallinearity–1.5±0.81.5LSB
(4)
Differentiallinearity–1±0.81.5LSB
Offseterror
(5)
–4±1.54LSB
Gainerror–4±1.54LSB
Transitionnoise25µV
RMS
Power-supplyrejectionWith500HzsinewaveonAVDD60dB
SAMPLINGDYNAMICS
Conversiontime16SCLK
Acquisitiontime80ns
Maximumsamplerate(throughputrate)40MHzSCLKwitha16-clockframe2MSPS
Aperturedelay
(6)
10ns
Aperturejitter
(6)
10ps
Stepresponse
(6)(3)
80ns
DYNAMICCHARACTERISTICS
Totalharmonicdistortion(THD)
(7)
20kHz,V
REF
=4.0V–92dB
20kHz,V
REF
=4.0V8284dB
Signal-to-noiseratio(SNR)
100kHz,V
REF
=4.0V83dB
Signal-to-noiseanddistorionratio(SINAD)20kHz,V
REF
=4.0V83.5dB
Spurious-freedynamicrange(SFDR)20kHz,V
REF
=4.0V94dB
Full-powerbandwidth
(8)
At–3dB15MHz
(1)Idealinputspan;doesnotincludegainoroffseterror.
(2)RefertotheInputCommon-ModeRangesectioninApplicationInformation.
(3)RefertoFigure76forsamplingcircuitdetails.
(4)LSBmeansleastsignificantbit.
(5)Measuredrelativetoanidealfull-scaleinput.
(6)Ensuredbysimulation.
(7)Calculatedonthefirstnineharmonicsoftheinputfrequency.
(8)Indicatessignalbandwidthforundersamplingapplications.
Copyright©2011,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3
ProductFolderLink(s):ADS7945ADS7946
Product specificaties
| Merk: | Texas Instruments |
| Categorie: | Niet gecategoriseerd |
| Model: | ADS7946 |
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