12-Bit, 1MSPS, 4-/8-Chan, Bipolar-Input, SAR ADC w PDF
Preview 12-Bit, 1MSPS, 4-/8-Chan, Bipolar-Input, SAR ADC w
ADS8634 ADS8638 www.ti.com SBAS541A–MAY2011–REVISEDAUGUST2011 12-Bit, 1MSPS, 4-/8-Channel, Bipolar-Input, SAR Analog-to-Digital Converter with Software-Selectable Ranges CheckforSamples:ADS8634,ADS8638 FEATURES DESCRIPTION 1 • SelectableInputRange: The ADS8634 and ADS8638 (ADS8634/8) are 12-bit 23 analog-to-digital converters (ADCs) capable of ±10V, ±5V,±2.5V,0Vto10V,or measuring inputs up to ±10V at 1MSPS. Using a 0Vto5V successive approximation register (SAR) core, these Upto±12VwithExternalReference ADCs provide a sample-and-hold front-end with no • NoLatentConversionsUpto1MSPS latency in conversions. The ADS8634 includes an • OutstandingPerformance: input multiplexer (mux) for measuring up to four 12BitsNoMissingCodes inputs.TheADS8638canmeasureuptoeightinputs. INL:±0.9LSB In addition to the input multiplexer, the ADS8634/8 SNR:71.8dB feature an internal temperature sensor, voltage • HighlyIntegrated: reference, and a digital comparator for setting alarm 4-or8-Channel InputMux thresholds on each input; therefore, a minimal amount of external components are required. A TemperatureSensor simple SPI-compatible interface provides for InternalVoltageReference communication and control. The digital supply AlarmThresholdsforEach Channel operates from 5V all the way down to 1.8V for direct • LowPower: connection to a wide range of processors and 14.45mWat1MSPS controllers. 5.85mWat0.1MSPS Ideal for demanding industrial measurement FlexiblePower-DownMode applications, the ADS8634/8 are fully specified over • SPI™-CompatibleSerialInterface the extended industrial temperature range of –40°C • ExtendedTemperatureRange: to +125°C and are available in a small form-factor QFN-24package. –40°Cto+125°C • SmallFootprint:4mm×4mmQFN Package APPLICATIONS • IndustrialProcessControls(PLC) • DataAcquisitionSystems • High-Speed,Closed-LoopSystems • DigitalPowerSupplies HVDD AVDD REF DVDD HVDD AVDD REF DVDD Alarm Alarm REF Threshold AIN0 REF Threshold AIN0 AIN1 AIN1 Comparator AL_PD AIN2 Comparator AL_PD AIN3 MUX AIN4 MUX AIN2 ADC ADC SPI CDSIN,,SDCOLUKT, AAIINN56 SPI CDSIN,,SDCOLUKT, AIN3 AIN7 STeenmsopr ADS8634 STeenmsopr ADS8638 AINGND AINGND HVSS AGND REFGND DGND HVSS AGND REFGND DGND 1 Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet. SPIisatrademarkofMotorola. 2 Allothertrademarksarethepropertyoftheirrespectiveowners. 3 PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2011,TexasInstrumentsIncorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarilyincludetestingofallparameters. ADS8634 ADS8638 SBAS541A–MAY2011–REVISEDAUGUST2011 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage. ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications. DEVICECOMPARISON(1) PRODUCT RESOLUTION CHANNELS SAMPLERATE ADS8634 4 12-Bit 1MSPS ADS8638 8 (1) Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orvisitthe deviceproductfolderatwww.ti.com. ABSOLUTE MAXIMUM RATINGS Overoperatingfree-airtemperaturerange,unlessotherwisenoted.(1) VALUE UNIT AINntoAGNDorAINGNDtoAGND HVSS–0.3toHVDD+0.3 V AVDDtoAGNDorDVDDtoDGND –0.3to7 V HVDDtoAGND –0.3to18 V HVSStoAGND –18to0.3 V HVDDtoHVSS –0.3to33 V DigitalinputvoltagetoDGND –0.3toDVDD+0.3 V DigitaloutputtoDGND –0.3toDVDD+0.3 V Operatingtemperaturerange –40to+125 °C Storagetemperaturerange –65to+150 °C Humanbodymodel(HBM) ±2000 V ESDratings,allpins Chargeddevicemodel(CDM) ±500 V (1) Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratings only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperating conditionsisnotimplied.Exposuretoabsolute–maximum–ratedconditionsforextendedperiodsmayaffectdevicereliability.Theseare stressratingsonlyandfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthosespecifiedintheElectrical Characteristicstableisnotimplied. 2 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):ADS8634ADS8638 ADS8634 ADS8638 www.ti.com SBAS541A–MAY2011–REVISEDAUGUST2011 ELECTRICAL CHARACTERISTICS: ADS8634, ADS8638 Minimum/maximumspecificationsatT =–40°Cto+125°C,f =1MSPS,HVDD=10Vto15V,HVSS=–10Vto–15V, A SAMPLE AVDD=4.75Vto5.25V,DVDD=2.7Vto3.6V,andV =2.5V,unlessotherwisenoted.Typicalspecificationsat+25°C, REF f =1MHz,HVDD=10V,HVSS=–10V,AVDD=3.3V,DVDD=3.3V,andV =2.5V,unlessotherwisenoted. SAMPLE REF ADS8634,ADS8638 PARAMETER TESTCONDITIONS MIN TYP MAX UNIT ANALOGINPUT ±2.5 V Bipolarranges,VREF=2.5V ±5 V Full-scaleinputspan(1) ±10 V 0to5 V Unipolarranges,VREF=2.5V 0to10 V AINxabsoluteinputrange HVSS HVDD V AINGNDabsoluteinputrange –0.2 0.2 V Inputcapacitance 8 pF Inputleakagecurrent At+125°C 200 nA SYSTEMPERFORMANCE Resolution 12 Bits Nomissingcodes 12 Bits Integrallinearity –1.5 +0.9/–0.9 1.5 LSB(2) Differentiallinearity –1.0 +0.9/–0.5 1.6 LSB Offseterror(3) –3 ±0.8 3 LSB ppmFS/°C( Offseterrordrift 0.75 4) Gainerror(5) –8 ±2 8 LSB Gainerrordrift 1.2 ppm/°C Noise 0.33 LSB AtFFChoutputcodewith Power-supplyrejection –87 dB 250mVPPand480HzrippleonAVDD Crosstalkonchannel0withchannel0permanentlyselected, Isolation 2kHzfull-scalesinewaveonchannel1,allotherchannels –110 dB crosstalk grounded Crosstalk Crosstalkonchannel0,2kHzfull-scalesinewaveonchannel1, Memorycrosstalk allotherchannelsgrounded,devicescanschannel0and –81 dB channel1alternately SAMPLINGDYNAMICS Conversiontime At20MHzSCLK,DVDD=2.7Vto5.25V 750 ns Acquisitiontime AVDD=2.7Vto5.25V 250 ns Maximumthroughputrate At20MHzSCLK,DVDD=2.7Vto5.25V 1 1 MSPS Aperturedelay 13 ns Stepresponse 250 ns (1) Idealinputspan;doesnotincludegainoroffseterror. (2) LSBmeansleastsignificantbit. (3) Measuredrelativetoanidealfull-scaleinput. (4) ppmFS/°Cisdriftmeasuredinpartspermillionoffull-scalerangeperdegreecentigrade. (5) Doesnotincludereferencedrift. Copyright©2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 3 ProductFolderLink(s):ADS8634ADS8638 ADS8634 ADS8638 SBAS541A–MAY2011–REVISEDAUGUST2011 www.ti.com ELECTRICAL CHARACTERISTICS: ADS8634, ADS8638 (continued) Minimum/maximumspecificationsatT =–40°Cto+125°C,f =1MSPS,HVDD=10Vto15V,HVSS=–10Vto–15V, A SAMPLE AVDD=4.75Vto5.25V,DVDD=2.7Vto3.6V,andV =2.5V,unlessotherwisenoted.Typicalspecificationsat+25°C, REF f =1MHz,HVDD=10V,HVSS=–10V,AVDD=3.3V,DVDD=3.3V,andV =2.5V,unlessotherwisenoted. SAMPLE REF ADS8634,ADS8638 PARAMETER TESTCONDITIONS MIN TYP MAX UNIT DYNAMICCHARACTERISTICS At1kHz –81 dB Totalharmonicdistortion(6)(THD) At100kHz –80 dB At1kHz 71 71.8 dB Signal-to-noiseratio(SNR) At100kHz 71.1 dB Signal-to-noiseanddistortionratio At1kHz 70.1 71.3 dB (SINAD) At100kHz 70.5 dB At1kHz –83 dB Spurious-freedynamicrange(SFDR) At100kHz –80 dB Full-powerbandwidth At–3dB 1 MHz DIGITALINPUT/OUTPUT Logicfamily CMOS V VIH 0.7DVDD V VIL 0.3DVDD V Logiclevel VOH With20pFloadonSDO 0.8DVDD V VOL With20pFloadonSDO 0.2DVDD V EXTERNALVOLTAGEREFERENCE 3.0or Referenceinput AVDD, voltagerange VREF 2.0 whichever V isless INTERNALVOLTAGEREFERENCE Referenceoutputvoltage 2.5 V Initialaccuracy –1.2 1.2 % Temperaturedrift 20 ppm/°C Drivecurrent,source(7) 750 µA Drivecurrent,sink 20 µA Driveroutputimpedance 1 Ω Turn-onsettlingtime With10µFdecouplingcapacitorfromREFtoREFGND 9 ms INTERNALTEMPERATURESENSOR Absoluteaccuracy 5 %ofFSR (6) Calculatedonthefirstnineharmonicsoftheinputfrequency. (7) Internalreferenceoutputisshort-circuitprotected.Incaseofshort-circuittoground,thedrivecurrentislimitedtothisvalue. 4 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):ADS8634ADS8638 ADS8634 ADS8638 www.ti.com SBAS541A–MAY2011–REVISEDAUGUST2011 ELECTRICAL CHARACTERISTICS: ADS8634, ADS8638 (continued) Minimum/maximumspecificationsatT =–40°Cto+125°C,f =1MSPS,HVDD=10Vto15V,HVSS=–10Vto–15V, A SAMPLE AVDD=4.75Vto5.25V,DVDD=2.7Vto3.6V,andV =2.5V,unlessotherwisenoted.Typicalspecificationsat+25°C, REF f =1MHz,HVDD=10V,HVSS=–10V,AVDD=3.3V,DVDD=3.3V,andV =2.5V,unlessotherwisenoted. SAMPLE REF ADS8634,ADS8638 PARAMETER TESTCONDITIONS MIN TYP MAX UNIT POWER-SUPPLYREQUIREMENTS VAVDD 2.7 3.3 5.25 V VDVDD 1.65 3.3 5.25 V Supplyvoltage VHVDD 10V<VHVDD–VHVSS<30V 5 10 15 V VHVSS 10V<VHVDD–VHVSS<30V –15 –10 0 V AtVAVDD=2.7Vto3.6Vand1MHzthroughput,normalmode 2.5 mA withinternalreferenceandtemperaturesensoroff IAVDD(dynamic) AtVAVDD=4.75Vto5.25Vand1MHzthroughput,normalmode 3.1 3.6 mA withinternalreferenceandtemperaturesensoroff AtVAVDD=2.7Vto3.6VandSCLKoff,normalmodewith 1.45 mA AVDDsupply internalreferenceandtemperaturesensoroff current IAVDD(static) AtVAVDD=4.75Vto5.25VandSCLKoff,normalmodewith 1.5 1.9 mA internalreferenceandtemperaturesensoroff IAVDD(ref)(8) AretfeVrAeVnDcDe=o2n.7aVndtote5m.2p5eVra,taudredistieonnsaolrAoVfDfDcurrentwithinternal 180 µA IAVDD(temp)(9) AtetmVpAeVrDaDtu=re2.s7eVnstoor5o.2n5aVn,dadindtietironnaallreAfVeDreDncceurorfefntwithinternal 400 µA HVDDsupply IHVDD(dynamic) HVDD=15Vand1MSPSthroughput 270 350 µA current IHVDD(static) HVDD=15VanddevicestaticwithSCLKoff 5 µA HVSSsupply IHVSS(dynamic) HVSS=–15Vand1MSPSthroughput 520 µA current IHVSS(static) HVSS=–15VanddevicestaticwithSCLKoff 5 µA DVDDsupply current(10) IDVDD DVDD=3.3V,fSAMPLE=1MSPS,DOUTload=20pF 2.5 mA SCLKoff,internalreferenceandtemperaturesensoroff 10 µA AVDDcurrent SCLKon,internalreferenceandtemperaturesensoroff 160 µA Power-downstate HVDDcurrent 5 µA HVSScurrent 5 µA TEMPERATURERANGE Specifiedperformance –40 +125 °C (8) AddI toI orI (asapplicable),ifinternalreferenceisselected. AVDD(ref) AVDD(dynamic) AVDD(static) (9) AddI toI orI (asapplicable),ifinternaltemperaturesensorisenabled. AVDD(temp) AVDD(dynamic) AVDD(static) (10) I consumesonlydynamiccurrent.I =C ×V ×numberof0→1transitionsinDOUT×f .I isa DVDD DVDD LOAD DVDD SAMPLE DVDD load-dependentcurrent;thereisnocurrentwhentheoutputisnottoggling. THERMAL INFORMATION ADS8634/8RGE THERMALMETRIC(1) RGE UNITS 24PINS θ Junction-to-ambientthermalresistance 32.6 JA θ Junction-to-case(top)thermalresistance 30.5 JCtop θ Junction-to-boardthermalresistance 3.3 JB °C/W ψ Junction-to-topcharacterizationparameter 0.4 JT ψ Junction-to-boardcharacterizationparameter 9.3 JB θ Junction-to-case(bottom)thermalresistance 2.6 JCbot (1) Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953. Copyright©2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 5 ProductFolderLink(s):ADS8634ADS8638 ADS8634 ADS8638 SBAS541A–MAY2011–REVISEDAUGUST2011 www.ti.com PARAMETER MEASUREMENT INFORMATION TIMING DIAGRAM 1/f SAMPLE t su(CS-SCLK) CS 1R 1F 2 3 4 5 12 13 14 15 16R 16F SCLK td(CS-DO) th(SCLK-DOUT) td(SCLK-DOUT) tw(SCLK_H) tw(SCLK_L) td(CS-DOHZ) DOUT t t su(DIN-SCLK) h(SCLK-DIN) DIN Acquisition (Internal) t t c (ACQ) Table1. TimingRequirements(1)(2)(3) ADS8634,ADS8638 TEST PARAMETER CONDITIONS MIN TYP MAX UNIT DVDD=1.8V 15 SCLK t Conversiontime DVDD=3V 15 SCLK c DVDD=5V 15 SCLK DVDD=1.8V 250 ns t Acquisitiontime DVDD=3V 250 ns (ACQ) DVDD=5V 250 ns DVDD=1.8V 52.5 ns t Delaytime,CSlowtofirstdata(D0toD15)out DVDD=3V 40.0 ns d(CS-DO) DVDD=5V 30.5 ns DVDD=1.8V 26.0 ns t Setuptime,CSlowtofirstSCLKrisingedge DVDD=3V 18.5 ns su(CS-SCLK) DVDD=5V 15.5 ns DVDD=1.8V 51.5 ns t Delaytime,SCLKfallingtoDOUT DVDD=3V 33.0 ns d(SCLK-DOUT) DVDD=5V 25.3 ns DVDD=1.8V 5.5 ns t Holdtime,SCLKfallingtoDOUTvalid DVDD=3V 5.0 ns h(SCLK-DOUT) DVDD=5V 4.7 ns DVDD=1.8V 7.3 31.0 ns t DelaytimeCShightoDOUThigh-z DVDD=3V 6.4 22.0 ns d(CS-DOHZ) DVDD=5V 5.9 16.4 ns (1) Allspecificationsat–40°Cto+125°C,unlessotherwisenoted. (2) 1.8Vspecificationsapplyfrom1.65Vto1.95V;3Vspecificationsapplyfrom2.7Vto3.6V;and5Vspecificationsapplyfrom4.75Vto 5.25V. (3) With20pFloadonDOUT. 6 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):ADS8634ADS8638 ADS8634 ADS8638 www.ti.com SBAS541A–MAY2011–REVISEDAUGUST2011 PARAMETER MEASUREMENT INFORMATION (continued) Table1. TimingRequirements(1)(2)(3)(continued) ADS8634,ADS8638 TEST PARAMETER CONDITIONS MIN TYP MAX UNIT DVDD=1.8V 7.0 ns t Setuptime,DINvalidtoSCLKrisingedge DVDD=3V 6.0 ns su(DIN-SCLK) DVDD=5V 5.0 ns DVDD=1.8V 9.0 ns t Holdtime,SCLKrisingtoDINvalid DVDD=3V 8.0 ns h(SCLK-DIN) DVDD=5V 7.0 ns DVDD=1.8V 25 ns t Pulseduration,SCLKhigh DVDD=3V 20 ns W(SCLK_H) DVDD=5V 20 ns DVDD=1.8V 25 ns t Pulseduration,SCLKlow DVDD=3V 20 ns W(SCLK_L) DVDD=5V 20 ns DVDD=1.8V 16 MHz f SCLKfrequency DVDD=3V 20 MHz SCLK DVDD=5V 20 MHz DVDD=1.8V 0.84 MSPS f Samplingfrequency DVDD=3V 1 MSPS SAMPLE DVDD=5V 1 MSPS POWER-UP TIMING REQUIREMENTS CS 1 2 16 1 2 16 1 2 16 1 2 16 SCLK AL_PD Programmed as PD T d(PWRUP) Power-Down State Power-Down Power-Up Delay Active (Internal) DOUT Invalid Data Invalid Data Invalid Data Valid Data Valid Data Table2. TIMINGREQUIREMENTS(1) ADS8634,ADS8638 PARAMETER MIN TYP MAX UNIT t (2) Power-updelayfromfirstCSafterpower-upcommand 1 µs d(PWRUP) Invalidconversionsafterdeviceisactive(poweredup) 1 Conversion (1) Allspecificationsat–40°Cto+125°C,unlessotherwisenoted. (2) Power-uptimeexcludesinternalreferenceandtemperaturesensor. Copyright©2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 7 ProductFolderLink(s):ADS8634ADS8638 ADS8634 ADS8638 SBAS541A–MAY2011–REVISEDAUGUST2011 www.ti.com PIN CONFIGURATIONS RGEPACKAGE 4mm×4mmQFN-24 (TOPVIEW) D EF EFGN L_PD VDD GND OUT R R A D D D 4 3 2 1 0 9 2 2 2 2 2 1 AVDD 1 18 DIN AGND 2 17 SCLK AGND 3 Thermal Pad 16 CS (Bottom Side) NC 4 15 HVSS AINGND 5 14 HVDD NC 6 13 NC 7 8 9 10 11 12 C 3 2 1 0 C N N N N N N AI AI AI AI Figure1. ADS8634PinConfiguration ADS8634PINASSIGNMENTS PINNUMBER NAME FUNCTION DESCRIPTION 1 AVDD Analogpowersupply Analogpowersupply 2,3 AGND Analogpowersupply Analogground Thesepinsarenotinternallyconnected;donotfloatthesepins. 4,6,7,12,13 NC — ItisrecommendedtoconnectthesepinstoAGND. 5 AINGND Input Commonforallanaloginputchannels;actsasgroundsenseterminal 8 AIN3 Analoginput Analoginputchannel3 9 AIN2 Analoginput Analoginputchannel2 10 AIN1 Analoginput Analoginputchannel1 11 AIN0 Analoginput Analoginputchannel0 14 HVDD High-voltagepowersupply High-voltagepositivesupplyformultiplexerchannels 15 HVSS High-voltagepowersupply High-voltagenegativesupplyformultiplexerchannels 16 CS Digitalinput Chipselectinput 17 SCLK Digitalinput Serialclockinput 18 DIN Digitalinput Serialdatainput 19 DOUT Digitaloutput Serialdataoutput 20 DGND Digitalpowersupply Digitalground 21 DVDD Digitalpowersupply DigitalI/Osupply Digitaloutput Activehigh,outputindicatesalarm(programmedasanoutputpin) Activelow,asynchronouspower-down. 22 AL_PD Thedevicefeaturesaninternal,weakpull-upresistorfromtheAL_PDpintoDVDD.The Digitalinput AL_PDpincanalsobefloatedwhenprogrammedasapower-downinput. (Thedefaultconditionforthispinisprogrammedasapower-downinputpin.) Referencegroundinputtodevicewhenanexternalreferenceisselected. 23 REFGND Analoginput Thispinactsasareferencedecouplinggroundterminalwhenaninternalreferenceis selected. Referenceinputtodevicewhenanexternalreferenceisselected. 24 REF Analoginput Thispinactsasareferencedecouplingterminalwhenaninternalreferenceisselected. 8 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):ADS8634ADS8638 ADS8634 ADS8638 www.ti.com SBAS541A–MAY2011–REVISEDAUGUST2011 RGEPACKAGE 4mm×4mmQFN-24 (TOPVIEW) D EF EFGN L_PD VDD GND OUT R R A D D D 4 3 2 1 0 9 2 2 2 2 2 1 AVDD 1 18 DIN AGND 2 17 SCLK AGND 3 Thermal Pad 16 CS (Bottom Side) NC 4 15 HVSS AINGND 5 14 HVDD AIN7 6 13 AIN0 7 8 9 10 11 12 6 5 4 3 2 1 N N N N N N AI AI AI AI AI AI Figure2. ADS8638PinConfiguration ADS8638PINASSIGNMENTS PINNUMBER NAME FUNCTION DESCRIPTION 1 AVDD Analogpowersupply Analogpowersupply 2,3 AGND Analogpowersupply Analogground Thispinisnotinternallyconnected;donotfloatthispin. 4 NC — ItisrecommendedtoconnectthispintoAGND. 5 AINGND Input Commonforallanaloginputchannels;actsasgroundsenseterminal 6 AIN7 Analoginput Analoginputchannel7 7 AIN6 Analoginput Analoginputchannel6 8 AIN5 Analoginput Analoginputchannel5 9 AIN4 Analoginput Analoginputchannel4 10 AIN3 Analoginput Analoginputchannel3 11 AIN2 Analoginput Analoginputchannel2 12 AIN1 Analoginput Analoginputchannel1 13 AIN0 Analoginput Analoginputchannel0 14 HVDD High-voltagepowersupply High-voltagepositivesupplyformultiplexerchannels 15 HVSS High-voltagepowersupply High-voltagenegativesupplyformultiplexerchannels 16 CS Digitalinput Chipselectinput 17 SCLK Digitalinput Serialclockinput 18 DIN Digitalinput Serialdatainput 19 DOUT Digitaloutput Serialdataoutput 20 DGND Digitalpowersupply Digitalground 21 DVDD Digitalpowersupply DigitalI/Osupply Digitaloutput Activehigh,outputindicatingalarm(programmedasanoutputpin) 22 AL_PD Activelow,asynchronouspower-down Digitalinput (programmedasaninputpin,defaultcondition) Referencegroundinputtodevicewhenanexternalreferenceisselected. 23 REFGND Analoginput Thispinactsasreferencedecouplinggroundterminalwhenaninternalreferenceis selected. Referenceinputtodevicewhenanexternalreferenceisselected. 24 REF Analoginput Thispinactsasreferencedecouplingterminalwhenaninternalreferenceisselected. Copyright©2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 9 ProductFolderLink(s):ADS8634ADS8638 ADS8634 ADS8638 SBAS541A–MAY2011–REVISEDAUGUST2011 www.ti.com TYPICAL CHARACTERISTICS AtT =+25°C,internalreference=2.5V,channel0,range=±2.5V,AVDD=2.7V,DVDD=1.8V,HVDD=10V,HVSS A =–10V,andf =1MSPS,unlessotherwisenoted. SAMPLE DNLvsANALOGSUPPLYVOLTAGE DNLvsSIGNALRANGE 1.6 1.6 1.4 1.4 B) 1.2 Maximum DNL B) 1.2 Maximum DNL LS 1 LS 1 y ( 0.8 y ( 0.8 arit 0.6 arit 0.6 e e nlin 0.4 nlin 0.4 o 0.2 o 0.2 N N al 0 al 0 nti −0.2 Minimum DNL nti −0.2 Minimum DNL e e er −0.4 er −0.4 Diff −0.6 Diff −0.6 −0.8 −0.8 −1 −1 2.7 3.2 3.7 4.2 4.7 5.2 5.7 ±2.5V ±5V ±10V 0−5V 0−10V AVDD (V) Signal Range G013 G014 Figure3. Figure4. DNLvsREFERENCEVOLTAGE DNLvsCHANNELNUMBER 1.6 1.6 1.4 1.4 B) 1.2 Maximum DNL B) 1.2 Maximum DNL LS 1 LS 1 y ( 0.8 y ( 0.8 arit 0.6 arit 0.6 e e nlin 0.4 nlin 0.4 o 0.2 o 0.2 N N al 0 al 0 nti −0.2 Minimum DNL nti −0.2 Minimum DNL e e er −0.4 er −0.4 Diff −0.6 Diff −0.6 −0.8 −0.8 −1 −1 2 2.2 2.4 2.6 2.8 3 0 1 2 3 4 5 6 7 Reference Voltage (V) Channel Number G015 G016 Figure5. Figure6. DNLvsFREE-AIRTEMPERATURE DNLvsPOSITIVEHIGH-VOLTAGESUPPLY 1.6 1.6 1.4 1.4 Maximum DNL B) 1.2 Maximum DNL B) 1.2 LS 1 LS 1 y ( 0.8 y ( 0.8 arit 0.6 arit 0.6 e e nlin 0.4 nlin 0.4 o 0.2 o 0.2 N N al 0 al 0 enti −0.2 Minimum DNL enti −0.2 Minimum DNL er −0.4 er −0.4 Diff −0.6 Diff −0.6 −0.8 −0.8 −1 −1 −40 −25 −10 5 20 35 50 65 80 95 110 125 2.5 5 7.5 10 12.5 15 Free-Air Temperature (°C) HVDD, Positive High-Voltage Supply (V) G017 G018 Figure7. Figure8. 10 SubmitDocumentationFeedback Copyright©2011,TexasInstrumentsIncorporated ProductFolderLink(s):ADS8634ADS8638
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