16 Bit 600-kHz Pseudo-Differential Input Micropower Sampling ADC PDF
Preview 16 Bit 600-kHz Pseudo-Differential Input Micropower Sampling ADC
(cid:2)(cid:17)(cid:14)(cid:14)(cid:20)(cid:2)(cid:14)(cid:13)(cid:18)(cid:12)(cid:0)(cid:4)(cid:14)(cid:13)(cid:8)(cid:17)(cid:7)(cid:16)(cid:15) (cid:10)(cid:14)(cid:13)(cid:11)(cid:0)(cid:5)(cid:9)(cid:19)(cid:6)(cid:15)(cid:0) (cid:3)(cid:12)(cid:15)(cid:16)(cid:14)(cid:17)(cid:11)(cid:9)(cid:12)(cid:16)(cid:15) ADS8370 SLAS450–JUNE2005 16-BIT, 600-kHz, PSEUDO-DIFFERENTIAL INPUT, MICROPOWER SAMPLING ANALOG-TO-DIGITAL CONVERTER WITH SERIAL INTERFACE AND REFERENCE FEATURES • PincompatibleWith18-BitADS8380 • 600-kHz SampleRate APPLICATIONS • ±0.5LSBTyp,±1.25LSBMax INL • ±0.4LSBTyp,±0.75LSBMax DNL • MedicalInstruments • 16-BitNMC • OpticalNetworking • TransducerInterface • SINAD89.5dB,SFDR119dBatf =1kHz i • HighAccuracyDataAcquisition Systems • High-SpeedSerialInterfaceupto40MHz • Magnetometers • OnboardReferenceBuffer • Onboard4.096-VReference DESCRIPTION • Pseudo-DifferentialInput,0Vto4.2V • OnboardConversionClock The ADS8370 is a high performance 16-bit, 600-kHz A/D converter with single-ended (pseudo-differential) • SelectableOutputFormat,2'sComplementor input. The device includes an 16-bit capacitor-based StraightBinary SAR A/D converter with inherent sample and hold. • ZeroLatency The ADS8370 offers a high-speed CMOS serial • WideDigital Supply interfacewith clockspeedsupto40MHz. • LowPower: The ADS8370 is available in a 28 lead 6 × 6 QFN – 110mWat600kHz package and is characterized over the industrial –40°Cto85°Ctemperaturerange. – 15mWDuringNapMode – 10m WDuring PowerDown • 28-Pin6x6QFNPackage HighSpeedSARConverter Family Type/Speed 500kHz ~600kHz 750kHZ 1MHz 1.25MHz 2MHz 3MHz 4MHz ADS8383 ADS8381 18-BitPseudo-Diff ADS8380(S) 18-BitPseudo-Bipolar,FullyDiff ADS8382(S) 16-BitPseudo-Diff ADS8370(S) ADS8371 ADS8401/05 ADS8411 16-BitPseudo-Bipolar,FullyDiff ADS8372(S) ADS8402/06 ADS8412 14-BitPseudo-Diff ADS7890(S) ADS7891 12-BitPseudo-Diff ADS7886 ADS7881 SAR Output FS Latches SCLK and SB/2C +IN + 3-State _ CDAC Drivers SDO −IN Comparator REFIN CS Conversion CONVST 4.096-V and BUSY Control Logic REFOUT Internal Clock PD Reference Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet. PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2005,TexasInstrumentsIncorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarilyincludetestingofallparameters. ADS8370 www.ti.com SLAS450–JUNE2005 Thesedeviceshavelimitedbuilt-inESDprotection.Theleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoam duringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates. ORDERINGINFORMATION(1) MAXIMUM MAXIMUM NOMISSING TRANSPORT INTEGRAL DIFFERENTIAL CODES PACKAGE PACKAGE TEMPERATURE ORDERING MODEL MEDIA LINEARITY LINEARITY RESOLUTION TYPE DESIGNATOR RANGE INFORMATION QUANTITY (LSB) (LSB) (BIT) SmallTapeand ADS8370IRHPT 28Pin reel250 ADS8370I ±2 –1/1.5 16 RHP –40°Cto85°C 6×6QFN Tapeandreel ADS8370IRHPR 2500 SmallTapeand ADS8370IBRHPT 28Pin reel250 ADS8370IB ±1.25 ±0.75 16 RHP –40°Cto85°C 6×6QFN Tapeandreel ADS8370IBRHPR 2500 (1) Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTI websiteatwww.ti.com. ABSOLUTE MAXIMUM RATINGS overoperatingfree-airtemperaturerangeunlessotherwisenoted(1) UNIT +INtoAGND –0.3Vto+VA+0.3V –INtoAGND –0.3Vto+VA+0.3V Voltage +VAtoAGND –0.3Vto6V +VBDtoBDGND –0.3Vto6V DigitalinputvoltagetoBDGND –0.3Vto+VBD+0.3V Digitalinputvoltageto+VA +0.3V Operatingfree-airtemperaturerange,T –40°Cto85°C A Storagetemperaturerange,T –65°Cto150°C stg Junctiontemperature(T max) 150°C J Powerdissipation (Tmax–T )/q J A JA QFNpackage q thermalimpedance 86°C/W JA Vaporphase(60sec) 215°C Leadtemperature,soldering Infrared(15sec) 220°C (1) Stressesbeyondthoselistedunder"absolutemaximumratings"maycausepermanentdamagetothedevice.Thesearestressratings only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunder"recommendedoperating conditions"isnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability. 2 SubmitDocumentationFeedback ADS8370 www.ti.com SLAS450–JUNE2005 SPECIFICATIONS At–40°Cto85°C,+VA=+5V,+VBD=+5Vor+VBD=+2.7V,usinginternalorexternalreference,f =600kHz, SAMPLE unlessotherwisenoted.(Allperformanceparametersarevalidonlyafterdevicehasproperlyresumedfrompowerdown,see Table2.) ADS8370IB ADS8370I PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX ANALOGINPUT Full-scale inputvoltage(1) +IN–(–IN) 0 Vref 0 Vref V +IN –0.2 Vref+0.2 –0.2 Vref+0.2 Absoluteinputvoltage V –IN –0.2 0.2 –0.2 0.2 Samplingcapacitance (measuredfrom±INto 40 40 pF AGND) Inputleakagecurrent 1 1 nA SYSTEMPERFORMANCE Resolution 16 16 Bits Nomissingcodes 16 16 Bits Quietzonesobserved –1.25 ±0.5 1.25 –2 2 LSB INL Integrallinearity(2)(3)(4) Quietzonesnotobserved ±0.8 (16bit) Quietzonesobserved –0.75 ±0.4 0.75 –1 1.5 LSB DNL Differentiallinearity(3) Quietzonesnotobserved ±0.75 (16bit) EO Offseterror(3) –0.75 ±0.4 0.75 –1.5 1.5 mV Offsettemperaturedrift(3) ±0.4 ±0.4 ppm/°C EG Gainerror(3)(5) –0.075 0.075 –0.15 0.15 %FS Gaintemperaturedrift(3)(5) ±1.25 ±1.25 ppm/°C AtDC 80 80 CMRR Common-moderejectionratio [+IN–(–IN)]=Vref/2with dB 50mVp-pcommonmode 55 55 signalat1MHz Noise At0Vanaloginput 40 40 m VRMS DCPowersupplyrejection PSRR Atfullscaleanaloginput 55 55 dB ratio SAMPLINGDYNAMICS Conversiontime 1.0 1.16 1.0 1.16 m s Acquisitiontime 0.50 0.50 m s Throughputrate 600 600 kHz Aperturedelay 10 10 ns Aperturejitter 12 12 psRMS Stepresponse (6) 400 400 ns Overvoltagerecovery 400 400 ns (1) Idealinputspan;doesnotincludegainoroffseterror. (2) LSBmeansleastsignificantbit. (3) MeasuredusinganaloginputcircuitinFigure51anddigitalstimulusinFigure56andFigure57andreferencevoltageof4.096V. (4) ThisisendpointINL,notbestfit. (5) Measuredusingexternalreferencesourcesodoesnotincludeinternalreferencevoltageerrorordrift. (6) DefinedassamplingtimenecessarytosettleaninitialerrorofVrefonthesamplingcapacitortoafinalerrorof1LSBat16-bitlevel. MeasuredusingtheinputcircuitinFigure51. SubmitDocumentationFeedback 3 ADS8370 www.ti.com SLAS450–JUNE2005 SPECIFICATIONS (continued) At–40°Cto85°C,+VA=+5V,+VBD=+5Vor+VBD=+2.7V,usinginternalorexternalreference,f =600kHz, SAMPLE unlessotherwisenoted.(Allperformanceparametersarevalidonlyafterdevicehasproperlyresumedfrompowerdown,see Table2.) ADS8370IB ADS8370I PARAMETER TESTCONDITIONS UNIT MIN TYP MAX MIN TYP MAX DYNAMICCHARACTERISTICS VIN=4Vp-pat1kHz –112 –111 Totalharmonic THD distortion(7)(8) VIN=4Vp-pat10kHz –111 –111 dB VIN=4Vp-pat100kHz –92 –92 VIN=4Vp-pat1kHz 89.5 89.5 SNR Signal-to-noiseratio(7) VIN=4Vp-pat10kHz 89.5 89 dB VIN=4Vp-pat100kHz 89.5 88.5 VIN=4Vp-pat1kHz 89.5 89.5 Signal-to-noise SINAD +distortion(7)(8) VIN=4Vp-pat10kHz 89.5 89 dB VIN=4Vp-pat100kHz 87.5 87 VIN=4Vp-pat1kHz 119 119 Spuriousfreedynamic SFDR range(7) VIN=4Vp-pat10kHz 117 117 dB VIN=4Vp-pat100kHz 92 92 –3dBSmallsignalbandwidth 75 75 MHz REFERENCEINPUT Vref Referencevoltageinputrange 2.5 4.096 4.2 2.5 4.096 4.2 V Resistance(9) 10 10 MW INTERNALREFERENCEOUTPUT Vref Referencevoltagerange IOUT=0A,TA=30°C 4.088 4.096 4.104 4.088 4.096 4.104 V Sourcecurrent Staticload 10 10 m A Lineregulation +VA=4.75Vto5.25V 2.5 2.5 mV Drift IOUT=0A 25 25 ppm/°C DIGITALINPUT/OUTPUT LogicfamilyCMOS VIH Highlevelinputvoltage +VBD–1 +VBD+0.3 +VBD–1 +VBD+0.3 V VIL Lowlevelinputvoltage –0.3 0.8 –0.3 0.8 V VOH Highleveloutputvoltage IOH=2TTLloads +VBD–0.6 +VBD–0.6 V VOL Lowleveloutputvoltage IOL=2TTLloads 0.4 0.4 V Dataformat:MSBfirst,2'scomplementorstraightbinary(selectableviatheSB/2Cpin) POWERSUPPLYREQUIREMENTS Powersupply +VA 4.75 5 5.25 4.75 5 5.25 V voltage +VBD 2.7 3.3 5.25 2.7 3.3 5.25 V Supplycurrent,600-kHz ICC samplerate(10) +VA=5V 22 25 22 25 mA POWERDOWN ICC(PD) Supplycurrent,powerdown 2 2 m A NAPMODE ICC(NAP) Supplycurrent,napmode 3 3 mA Power-uptimefromnap 300 300 ns TEMPERATURERANGE Specifiedperformance –40 85 –40 85 °C (7) MeasuredusinganaloginputcircuitinFigure51anddigitalstimulusinFigure56andFigure57andreferencevoltageof4.096V. (8) Calculatedonthefirstnineharmonicsoftheinputfrequency. (9) Canvary+/-30%. (10) Thisincludesonly+VAcurrent.With+VBD=5V,+VBDcurrentistypically1mAwitha10-pFloadcapacitanceonthedigitaloutput pins. 4 SubmitDocumentationFeedback ADS8370 www.ti.com SLAS450–JUNE2005 TIMING REQUIREMENTS(1)(2)(3)(4)(5)(6) ADS8370I/ADS8370IB REF PARAMETER UNIT MIN TYP MAX FIGURE t Conversiontime 1000 1160 ns 41–44 conv t Acquisitiontimeinnormalmode 0.5 µs 41,42,44 acq1 t Acquisitiontimeinnapmode(t =t +t ) 0.8 µs 43 acq2 acq2 acq1 d18 CONVERSIONANDSAMPLING Quitesamplingtime(lasttoggleofinterfacesignalstoconvertstart 40–43, t 30 ns quiet1 command)(6) 45–47 Quitesamplingtime(convertstartcommandtofirsttoggleofinterface 40–43, t 10 ns quiet2 signals)(6) 45–47 Quiteconversiontime(lasttoggleofinterfacesignalstofallofBUSY)(6) 40–43, t 600 ns quiet3 45,47 t Setuptime,CONVSTbeforeBUSYfall 15 ns 41 su1 t Setuptime,CSbeforeBUSYfall(onlyforconversion/samplingcontrol) 20 ns 40,41 su2 t Setuptime,CONVSTbeforeCSrise(soCONVSTcanberecognized) 5 ns 41,43,44 su4 t Holdtime,CSafterBUSYfall(onlyforconversion/samplingcontrol) 0 ns 41 h1 t Holdtime,CONVSTafterCSrise 7 ns 43 h3 t Holdtime,CONVSTafterCSfall(toensurewidthofCONVST_QUAL)(4) 20 ns 42 h4 t CONVSTpulseduration 20 ns 43 w1 t CSpulseduration 10 ns 41,42 w2 Pulseduration,timebetweenconversionstartcommandandconversion t 1000 ns 44 w5 abortcommandtosuccessfullyaborttheongoingconversion DATAREADOPERATION t SCLKperiod 25 ns 45–47 cyc SCLKdutycycle 40% 60% t Setuptime,CSfallbeforefirstSCLKfall 10 ns 45 su5 t Setuptime,CSfallbeforeFSrise 7 ns 46,47 su6 t Setuptime,FSfallbeforefirstSCLKfall 7 ns 46,47 su7 t Holdtime,CSfallafterSCLKfall 3 ns 45 h5 t Holdtime,FSfallafterSCLKfall 7 ns 46,47 h6 t Setuptime,CSfallbeforeBUSYfall(onlyforreadcontrol) 20 ns 40,45 su2 t Setuptime,FSfallbeforeBUSYfall(onlyforreadcontrol) 20 ns 40,47 su3 t Holdtime,CSfallafterBUSYfall(onlyforreadcontrol) 15 ns 40,45 h2 t Holdtime,FSfallafterBUSYfall(onlyforreadcontrol) 15 ns 40,47 h8 t CSpulseduration 10 ns 45 w2 t FSpulseduration 10 ns 46,47 w3 MISCELLANEOUS t PDpulsedurationforresetandpowerdown 60 ns 53,54 w4 Allunspecifiedpulsedurations 10 ns (1) Allinputsignalsarespecifiedwitht =t =5ns(10%to90%ofV )andtimedfromavoltagelevelof(V +V )/2. r f DD IL IH (2) Allspecificationstypicalat–40°Cto85°C,+VA=+4.75Vto+5.25V,+VBD=+2.7Vto+5.25V. (3) Alldigitaloutputsignalsloadedwith10-pFcapacitors. (4) CONVST_QUALisCONVSTlatchedbyalowvalueonCS(seeFigure39). (5) Referencefigureindicatedisonlyarepresentativeofwherethetimingisapplicableandisnotexhaustive. (6) Quiettimezonesareformeetingperformanceandnotfunctionality. SubmitDocumentationFeedback 5 ADS8370 www.ti.com SLAS450–JUNE2005 TIMING CHARACTERISTICS(1)(2)(3)(4) ADS8370I/ADS8370IB REF PARAMETER UNIT MIN TYP MAX FIGURE CONVERSIONANDSAMPLING t Delaytime,conversionstartcommandtoconversionstart(aperturedelay) 10 ns 41,43 d1 t Delaytime,conversionendtoBUSYfall 5 ns 41–43 d2 t Delaytime,conversionstartcommandtoBUSYrise 20 ns 41 d4 t Delaytime,CONVSTrisetosamplestart 5 ns 43 d3 t Delaytime,CSfalltosamplestart 10 ns 43 d5 t Delaytime,conversionabortcommandtoBUSYfall 10 ns 44 d6 DATAREADOPERATION t Delaytime,CSfalltoMSBvalid 3 15 ns 45 d12 t Delaytime,FSrisetoMSBvalid 6 18 ns 46,47 d15 t Delaytime,BUSYfalltoMSBvalid(ifFSishighwhenBUSYfalls) 18 ns 47 d7 t Delaytime,SCLKrisetobitvalid 2 10 ns 45–47 d13 t Delaytime,CSrisetoSDO3-state 6 ns 45 d14 MISCELLANEOUS t Delaytime,PDrisetoSDO3-state 55 ns 53,54 d10 Napmode 300 ns 55 Delaytime,total Fullpowerdown(externalreferenceusedwithorwithout t +2x d11 54 t deviceresume 1-µF||0.1-µFcapacitoronREFOUT) conversions d18 time Fullpowerdown(internalreferenceusedwithorwithout 25(4) ms 53 1-µF||0.1-µFcapacitoronREFOUT) t Delaytime,untrimmedcircuitfullpower-downresumetime 1 ms 53,54 d11 Delaytime,device Nap 200 ns 55 td16 power-downtime Fullpowerdown(internal/externalreferenceused) 10 µs 53,54 Delaytime,trimmedinternalreferencesettling(eitherbyturningonsupplyor t 4 ms 53 d17 resumingfromfullpower-downmode),with1-µF||0.1-µFcapacitoronREFOUT (1) Allinputsignalsarespecifiedwitht =t =5ns(10%to90%ofV )andtimedfromavoltagelevelof(V +V )/2. r f DD IL IH (2) Allspecificationstypicalat–40°Cto85°C,+VA=+4.75Vto+5.25V,+VBD=+2.7Vto+5.25V. (3) Alldigitaloutputsignalsloadedwith10-pFcapacitors. (4) Includingt ,twoconversions(timetocycleCONVSTtwice),andt . d11 d17 6 SubmitDocumentationFeedback ADS8370 www.ti.com SLAS450–JUNE2005 PIN ASSIGNMENTS TOPVIEW 8 7 6 5 4 3 2 2 2 2 2 2 2 2 PD FS CS VST CLK SDO USY N S B O C 1 SB/2C BDGND 21 2 AGND +VBD 20 3 +VA AGND 19 4 AGND ADS8370 AGND 18 5 AGND +VA 17 6 +VA +VA 16 7 REFM AGND 15 T U N O FI F A E E C N N C V R R N +I −I N + 8 9 10 11 12 13 14 Note: Thepackagethermalpadmustbesolderedtotheprintedcircuitboardforthermalandmechanicalperformance. TERMINALFUNCTIONS PIN I/O DESCRIPTION NAME NO. AGND 2,4,5,15,18,19 – Analoggroundpins.AGNDmustbeshortedtoanaloggroundplanebelowthedevice. BDGND 21 – Digitalgroundforalldigitalinputsandoutputs.BDGNDmustbeshortedtotheanaloggroundplane belowthedevice. BUSY 22 O Statusoutput.Thispinishighwhenconversionisinprogress. CONVST 25 I Convertstart.ThissignalisqualifiedwithCSinternally. CS 26 I Chipselect FS 27 I Framesync.ThissignalisqualifiedwithCSinternally. +IN 11 I Noninvertinganaloginputchannel –IN 12 I Invertinganaloginputchannel NC 10,13 – Noconnection PD 28 I Powerdown.Deviceresetsandpowersdownwhenthissignalishigh. REFIN 8 I Reference(positive)input.REFINmustbedecoupledwithREFMpinusing0.1-m Fbypasscapacitor and1-m Fstoragecapacitor. REFM 7 I Referenceground.Tobeconnectedtoanaloggroundplane. REFOUT 9 O Internalreferenceoutput.ShortedtoREFINpinonlywheninternalreferenceisused. SB/2C 1 I Straightbinaryor2'scomplementoutputdataformat.Whenlowthedeviceoutputisstraightbinary format;whenhighthedeviceoutputis2'scomplementformat.SeeTable1. SCLK 24 I Serialclock.DataisshiftedontoSDOwiththerisingedgeofthisclock.ThissignalisqualifiedwithCS internally. SDO 23 O Serialdataout.AllbitsexceptMSBareshiftedoutattherisingedgeofSCLK. +VA 3,6,14,16,17 – Analogpowersupplies +VBD 20 – Digitalpowersupplyforalldigitalinputsandoutputs. SubmitDocumentationFeedback 7 ADS8370 www.ti.com SLAS450–JUNE2005 TYPICAL CHARACTERISTICS SIGNAL-TO-NOISE SIGNAL-TO-NOISERATIO ANDDISTORTION vs vs REFERENCEVOLTAGE REFERENCEVOLTAGE 91 B 91 +VA = 5 V, − d +VA = 5 V, e Ratio − dB 8990 +fTi AV= B =1D 2k 5=H° zC5, V, nd Distortion 8990 +fTi AV= B =1D 2k 5=H° zC5, V, al-to-Nois 88 o-Noise a 88 Sign 87 nal-t 87 SNR − 86 D − Sig 86 A N 85 SI 85 2.5 3 3.5 4 2.5 3 3.5 4 Vref − Reference Voltage − V Vref − Reference Voltage − V Figure1. Figure2. SPURIOUSFREEDYNAMICRANGE TOTALHARMONICDISTORTION vs vs REFERENCEVOLTAGE REFERENCEVOLTAGE B 120 −106 d +VA = 5 V, e − 119 +VBD = 5 V, B Rang 118 Tfi A= =1 2k5H°zC, n − d −107 mic 117 ortio −108 Free Dyna 111156 monic Dist −109 ous 114 Har −110 Spuri 113 Total ++VVAB D= =5 5V ,V, FDR − 112 THD − −111 fTi A= =1 2k5H°zC, S 111 −112 2.5 3 3.5 4 2.5 3 3.5 4 Vref − Reference Voltage − V Vref − Reference Voltage − V Figure3. Figure4. EFFECTIVENUMBEROFBITS EFFECTIVENUMBEROFBITS vs vs REFERENCEVOLTAGE FREE-AIRTEMPERATURE 14.6 14.7 s +VA = 5 V, s Bit +VBD = 5 V, Bit of Bits − 1144..45 fTi A= =1 2k5H°zC, of Bits − 14.6 er er 14.5 mb 14.3 mb u u N N ve 14.2 ve 14.4 cti cti Effe 14.1 Effe ++VVAB D= =5 5V ,V, B − B − 14.3 REFIN = 4.096 V, O 14 O fi = 1 kHz, N N E E 13.9 14.2 2.5 3 3.5 4 −40 −25 −10 5 20 35 50 65 80 Vref − Reference Voltage − V TA − Free-Air-Temperature − (cid:1)C Figure5. Figure6. 8 SubmitDocumentationFeedback ADS8370 www.ti.com SLAS450–JUNE2005 TYPICAL CHARACTERISTICS (continued) SIGNAL-TO-NOISE SIGNAL-TO-NOISERATIO ANDDISTORTION vs vs FREE-AIRTEMPERATURE FREE-AIRTEMPERATURE 90 B 90 d − e Ratio − dB 898.59 nd Distortion 898.59 s a oi e Signal-to-N 888.58 +VA = 5 V, nal-to-Nois 888.58 +VA = 5 V, SNR − 87.5 +Rfi VE=B F1DI Nk = H= z5 4, V.0,96 V, AD − Sig 87.5 +Rfi VE=B F1DI Nk = H= z5 4, V.0,96 V, N 87 SI 87 −40 −25 −10 5 20 35 50 65 80 −40 −25 −10 5 20 35 50 65 80 TA − Free-Air-Temperature − (cid:1)C TA − Free-Air-Temperature − (cid:1)C Figure7. Figure8. SPURIOUSFREEDYNAMICRANGE TOTALHARMONICDISTORTION vs vs FREE-AIRTEMPERATURE FREE-AIRTEMPERATURE B 120 −100 − d B +VA = 5 V, namic Range 111111789 Distortion − d −−110042 +Rfi VE=B F1DI Nk = H= z5 4, V.0,96 V, urious Free Dy 111111456 +VA = 5 V, otal Harmonic −−110086 DR − Sp 111123 +Rfi VE=B F1DI Nk = H= z5 4, V.0,96 V, THD − T −110 F S 111 −112 −40 −25 −10 5 20 35 50 65 80 −40 −25 −10 5 20 35 50 65 80 TA − Free-Air-Temperature − (cid:1)C TA − Free-Air-Temperature − (cid:1)C Figure9. Figure10. SIGNAL-TO-NOISE EFFECTIVENUMBEROFBITS ANDDISTORTION vs vs INPUTFREQUENCY INPUTFREQUENCY 14.6 B 89.6 of Bits − Bits14.55 Distortion − d 8899..24 e Number 14.5 Noise and 89 ENOB − Effectiv14.45 ++RTAVVE AB=F D I=2N 5= 5=° C5 V4 ,V.0,96 V, NAD − Signal-to- 8888..68 ++RTAVVE AB=F D I=2N 5= 5=° C5 V4 ,V.0,96 V, 14.4 SI 88.4 1 10 100 1 10 100 fi − Input Frequency − kHz fi − Input Frequency − kHz Figure11. Figure12. SubmitDocumentationFeedback 9 ADS8370 www.ti.com SLAS450–JUNE2005 TYPICAL CHARACTERISTICS (continued) SIGNAL-TO-NOISERATIO SPURIOUSFREEDYNAMICRANGE vs vs INPUTFREQUENCY INPUTFREQUENCY 89.6 B 140 d − dB 89.4 nge − 120 oise Ratio 89.2 ynamic Ra 10800 N D o- 89 e al-t Fre 60 Sign 88.8 ous SNR − 88.6 ++RTAVVE AB=F D I=2N 5= 5=° C5 V4 ,V.0,96 V, DR − Spuri 2400 ++RTAVVE AB=F D I=2N 5= 5=° C5 V4 ,V.0,96 V, 88.4 SF 0 1 10 100 1 10 100 fi − Input Frequency − kHz fi − Input Frequency − kHz Figure13. Figure14. TOTALHARMONICDISTORTION vs INPUTFREQUENCY 0 +VA = 5 V, B d +VBD = 5 V, stortion − −−4200 RTAE =F I2N5 =°C 4.096 V, Di c oni −60 m ar H al −80 ot T D − −100 H T −120 1 10 100 fi − Input Frequency − kHz Figure15. HISTOGRAM HISTOGRAM 65536CONVERSIONS 100000CONVERSIONS WITHADCINPUTATZEROSCALE(0V) WITHADCINPUTCLOSETOFULLSCALE(4V) 40000 60000 +VA = 5 V, +VA = 5 V, +VBD = 5 V, +VBD = 5 V, 35000 REFIN = 4.096 V, 50000 REFIN = 4.096 V, 30000 TA = 25°C TA = 25°C 40000 25000 s Hits 20000 Hit 30000 15000 20000 10000 10000 5000 0 0 49 50 51 52 53 54 55 56 57 58 59 60 20 21 22 23 24 25 26 27 28 29 30 31 Code Out 54 54 54 54 54 54 54 54 54 54 54 54 (Straight Binary Code in Decimal) 6 6 6 6 6 6 6 6 6 6 6 6 Code Out (Straight Binary Code in Decimal) Figure16. Figure17. 10 SubmitDocumentationFeedback
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