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如何选择DAC

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如何选择DAC
在线问答[问：wangda
weidavid]请问专家，如果所做系统要求数模转换的精度很高，而速度没有什么要求，那应选择哪种芯片比较合算，就是说可以达到要求，又比较省钱。谢谢[答：Mariah]ForhighresolutionandlowspeedDAC,youcanconsidersigma-deltaDACs.ThiskindofDACsarealsocheap.[2003-10-3010:47:58][问：hjldfp]如何选择14位50MHz的A/DD/A芯片
[答：William]Ingeneral,theA/D,D/Aselectionisdependentonthetypeofendapplicationyouareworkingon.Forexample,forcommunication,SFDRisimportant.Pleaserefertotheproductdatasheetandselectionguidefordetails.[2003-10-3010:52:03]
[问：qiangnet]能否简单介绍下目前D/A转换器的工艺发展？失效模式？[答：Albert]FailuremodesrelatedtoDACsgenerallyresultfrommisapplicationofthedevice.
Usuallyovervoltage,breakingtheabsolutemaxratingsetc[2003-10-3010:52:59]
[问：davidlu]应用于视频（1Vpp，PAL625--1249，NTSC525--1024）采集，10位或12位并行输出，如何选用数模转换器？谢谢。
[答：Wayne]Ithinkyoumeanvideodecoder,notDAC.So,youcanchooseADV7189,whichsupport10/20bitextendedstandard.However,ifyoujustwanttoconvertdirectlytheCVBSsignaltodigitaldata,thenyoucanuseAD9203whichis10bit40MSPSADC,orAD9200whichis10bitand20MSPS,AD905110bit60MSPS.[2003-10-3010:53:17][问：aini8833
456.student]数模转换器种类和特性是怎样划分的？还有就是怎样和计算机相连？
[答：Mariah]TheclassificationofDACsisaccordingseveralcriterions,suchasspeed,I/Otypesetc.
YoucanusetheUARTprotocolofyourMCUtocommunicatewithPC.[2003-10-3010:53:59]

[问：samire]DAC的输出如何和平滑滤波器连接?对滤波器有何要求?如何进行设计这种滤波器?
[答：Mariah]Youcanfindthefilterdesignreferencetoolsbythelinkbelow.http://www.analog.com/techSupport/designTools/interactiveTools/filter/filter.html[2003-10-3010:59:25]
[问：john_ren]1.选择转换器时，应当重点注意那些问题？在基本参数符合要求，我们一般重点考虑价格，请提供参考意见
2.在对转换的数据进行加密时，有那些常用芯片，常用什么算法？3.转换器有无内置放大，即可以直接对模拟信号进行转换?
[答：William]1Costiscertainlyveryimportant.However,thelowestsystemcostdoesn"talwaysmeanchoosingthelowestcostcomponent.Forexample,higherperformanceproduct,eventhoughitmeanshighercomponentcost,canhelpreducemanufacturingcost(lessadjustment,shorterdevelopmenttime,etc.
2TheencryptionisusuallydoneattheFPGA/DSPbehindtheADC.Therearemanyalgorithmavailable,dependingonhowmuchprotectionyouneed.3ManyADC"shavePGAbuilt-in.Pleaserefertotheselectionguide.[2003-10-3011:00:05][问：grey_
yz1949]请问，目前最快的DAC芯片速度能达到多少M
[答：LiaoWS]ThefastestDACADIcanprovidenowis500MHz.ThepartnumbersareAD9782/4/6.[2003-10-3011:00:19][问：gecheng
liang]产品在中国的销售代理和技术支持是哪几家公司？高速处理芯片选型，开发需要哪些配套设备和开发软件？国内有没有用AD高速处理芯片作过开发，能否提供技术支持？购货周期一般是多长时间？
[答：William]Wehave5distributorsinChina.Arrow,Avnet(Chinatronics,Future,GEHK/Excelpoint,andWPG.TherearemanycompanieswhohaveusedourhighspeedADC.WehaveseveralexpertswhospecializeinhighspeedADC.Youcancallour800-810-1742fortechnical

support.Typicaldeliverytimeframe.is4-6weeksforourproducts.[2003-10-3011:04:13][问：vanbingo]如何选用数模转换器的精度
[答：Mariah]Youcanfindtheaccuracyspecificationinthedatasheet.Theaccuracyselectionofthepartsisdecidedbyyourapplication.[2003-10-3011:05:44]
[问：john_ren]1.如何实现转换电路与接口电路的电平兼容，常用那些方法？2.当需要不同的采样率进行采样时，如何实现？
3.数字滤波如何工作的？当码流变换时如何适应，FIR滤波器可以解决这个问题吗？
[答：Wayne]1.NormallyyoucanuseleveltranslationlikeADG3245/6/7.2.Don"tunderstandyourquestion,couldyoumakeitclear,oryoucancall8008101742laterfordiscussion.
3.It"sacomplicatedquestion,howeveryoucanfindachapterinADIbook"Mixed-SignalandDSPdesigntechniques".YoucanfindthePDFfileonwww.analog.combysearchingthewords.[2003-10-3011:07:39][问：662135]数模转换器的位数选择很重要吗？
[答：Mariah]Yes,itisthefirstimportantparameterwhenyouselectthepart.Itisdecidedbyyourapplicationrequirement.[2003-10-3011:07:47]
[问：guorock]SFDR是数字自由杂散动态范围，它是如何定义的？该指标对什么有影响？
[答：LiaoWS]YoucanfinditsdefinitionfromthedatasheetofADIDACs,AD9772forexample.Itwillinfluencethedynamicrangeofthesystem.[2003-10-3011:07:51][问：lichun
lei_1979]现在最快的模数/数模转换器采样率是多少？市场价格多少钱？
主要用于高速数据采集及重现。谢谢！
[答：William]Oneneedstoconsideralsotheresolutionwhentalkingaboutspeed.Also,thespeedishighlydependentontheapplication.Forexample,forcommunication,speedisintheorderofhundredsofMHz.But

forinstrumentation,thespeedisonlyatafewMSPS.Pricealsovariesquiteabitfromapplicationtoapplicationbecauseofdifferentperformancerequirement.[2003-10-3011:08:54]
[问：izk]如果DAC输入数据是高达200兆的LVDS的逻辑信号，ADI的产品有能满足该需求的解决方案吗？
[答：Wayne]We"redesigningthiskindofDACs,thepart#shouldbeAD972x,whichisscheduledtoreleasein2004.[2003-10-3011:08:56][问：ShaoJunmei]频率很高的情况下,如500M,A/D,D/A的选择,最应该注意是什么方面的问题?
[答：Albert]at14bitresolution,400Mspsad9775at16bitresolution,400Mspsad9777
AD9723/24/25willfeature600MSPSandarecurrentlyindefinition.AllproductssupportedbytheanalogdevicesHighSpeedConverterGroup.[2003-10-3011:09:08]
[问：zddpy]数据线与CPU控制器总线如何隔离最好。
[答：William]Typically,oneneedstotakecareoftheisolationofanaloganddigitallineswithseparategroundingandenoughphysicaldistancebetweenthelines.Itisalsodependentonthefrequencyofyourbusandthesignal.[2003-10-3011:10:50]
[问：ZHJNAME]请问一下，能不能推荐常用的8，12位的DAC（较高的性价比，电压输出）？
[答：Mariah]8bits:AD5300,AD5301,AD533010bits:AD5310,AD5311,AD5331
Ifyouwantstogettheproductshorform.ofADI,youcancalltoll-freenumber800-810-1742togetit.[2003-10-3011:11:08][问：SUMMER
_CHEN]如何降低DAC的噪声？对于时钟有何特殊要求？
[答：Albert]PrecisionDACsusearchitecturebasedaroundR-2Rarchitecturesandgenerallydonotrequireahighfrequencyclock.InhighspeedconverterstheclockisanintegralpartoftheDACandclockjitter,overshootandundershootontheclocksignalcontributetonoise.[2003-10-3011:12:45]

[问：wswtiger]如何确保高分辨率高速（14bit40MHz）的ADC的正确设计，在数模转换器的选择中电流输出型和电压输出型的究竟应该怎样选择呢，他们的优点各是什么呢？
[答：Jing]YoucanaccordtoyoudesigntoselectthecorrespondADCswithrelativeINL,DNLandtheinterface.Ifyouwanttogetmoreflexibilityandhighspeed,youcanselectthecurrentoutputDAC.Ofcourse,youshouldaddanotheramplifierafterthecurrentDACtogetthevoltageoutputinneeds.[2003-10-3011:14:43]
[问：shijh]14.9MHz的DDS应与什么样的D／A最佳匹配？
[答：LiaoWS]ADI"sDDSintegragtesDACinit.YoucanuseAD983XseriesofDDS.[2003-10-3011:14:48][问：SUMMER
_CHEN]请问，通讯领域中采用的数字中频技术，会用到高速的DA器件，那么ADI在这方面有什么样的产品，有何特点？
[答：Wayne]Itdependsonwhatkindofcommunicationsystemyou"redoing,SW,or3G.BasicallyyoucanchooseTxDACfamilylikeAD9786(16bit,400MSPS,AD977x,highlevelinterpolation,andhighsamplerateismainfeature.ForintegratedsolutionwithADC/DACtogetherwehaveMxFEfamilylikeAD986x(dualADC+DualDAC,highspeed,andwithsomeauxiliaryADC/DAC.We"vealsoDDSAD983x,AD985xforyourdesign.[2003-10-3011:15:31]
[问：hdwliang]请问如何用DA实现4-20mA输出
[答：LiaoWS]ADIhassuchkindofparts:AD420andAD421,both16-bitaccuracy.[2003-10-3011:15:46]
[问：tuolang2000]现在的MCU中是不是有些已经内置了A/D,D/A转换？？？？[答：Jing]Yes.OurADuCXXXserialproductsuchas
ADuC812,ADuC814,ADuC831/2andADuC841/2etcissuchkindofMCU[2003-10-3011:16:12]
[问：ljp]DAC用作遥控,和MCU相连时,我该选择串行接口或并行接口?请专家给点建议.

[答：Mariah]Serialinterfaceisusedforsmall,lowpower
applications.Parallelisusedforfastupdatelowoverhead,andhighchannelcountapplications.[2003-10-3011:16:19]
[问：kzw]有什么型号的DAC，是四通道的，12位并行的，转换速度不低于500K?[答：Jing]youcanrefertoourAD5340/1[2003-10-3011:16:42][问：QZDZ]现在高速DAC数据输入主要采用什么样的传输模式及通讯协议,对数据传输方面有什么特殊的要求或在设计方面应该特别留意的地方.
[答：LiaoWS]NowtheinterfacebetweenmicrocontrollerandDACismainlyTTL/CMOSlevel,butlatertherewillbeLVDSinterface.Whatyoushouldtakecareisthelayout,groundinganddecoupling.[2003-10-3011:17:25][问：kzw]AD公司的芯片精度比较高，这是大家公认的，但有一点不太好，就是太容易被烧掉了，我想问一下是为什么？难道是精度高就易坏吗？另外，芯片坏了一般不怎么发热，总是烧了还不知道，烧了后并不是不能工作，而是性能变坏，比如说，转换速度变慢。
[答：William]Idon"tbelieveourproductismoreeasytodamage.Itis,however,generallytruethata"mixedsignal"productismoresensitivetoESDdamage(thanpurelydigitaloranalog.ItissimplybecausewhenonecombinesbothanaloganddigitaltechnologiesontothesameIC,theprocessbecomeslessrobusttoESD.Whatyoudescribesisabitstrange,I"mcuriousifitwasbecausetheproductwaspurchasedfrom"electronicmarket"wherethequalityisoftennotstable.[2003-10-3011:17:42][问：riple]如何正确选择数模转换器:转换速率和带宽应如何取舍？[答：MelConway]Conversionspeed[settlingtime]andbandwidthspecificationsdependgreatlyontheDACarchitecture.Bandwidthcaneitherbe
1]multiplyingbandwidthwhichisthemaximumfrequencythatcanbeappliedtotheReferenceinputor
2]waveform.generationbandwidthwhichisrelatedtotheDACdigitalinputupdaterate,whichdependsontheinterfacetype,andconversionspeed.ThisbandwidthalsodependsontheSFDRSpuriousFreeDynamicRangeorTHDTotalHarmonicDistortionwhichgiveameasureofthequalityoftheoutputatcertainfrequencies.

ThehighestbandwitdthisalwaysobtainedfromCurrentOutputDACswhichhavenoinput/referencebuffersoroutputbufferstoadddelaystothesignalprocessing.OfcourseparallelinterfaceDACsupdatefasterandarethereforemoresuitableforhigherbandwidths.
Everythingdependsontheactualfrequenciesthataretobeused,andwhethertheapplicationisprocessingasignalinputorgeneratingasignaloutput.
UseVoltageoutputDACsuptoapprox100kHz,andCurrentoutputabovethis.Parallelinterfaceallowsanupdaterateofupto50MHz,whileSerialinterfaceallowsupdaterateuptoapprox3MHz.
ExampletheAD5443hasamultiplyingbandwidthof10MHz+butanupdaterateofonlyapprox3MHzasitisSerialinterface.TheAD5445withParallelinterfacecanupdateupto50MHzbutthesettlingtimelimitstheusablebandwidthtoapprox10MHz.
PleasecontactourApplicationsEngineerswithmoredetailsoftheapplicationforaselectionofsuitableparts.[2003-10-3011:18:16][问：wffae]请问，要达到高精度，对referencevoltage要求一定很高吗？[答：LiaoWS]Thevoltagereference"saccuracyinfluencetheaccuracyofthepart.SoforhighperformanceDAC,itneedshighperformancereference.[2003-10-3011:19:41]
[问：yoursdd]如果对视频信号进行数模/模数转换该如何选择转换器，它的关键性规格是哪几个方面呢？谢谢！
[答：Wayne]IfyouwanttodecodeCVBSorY/CsignaltoYUVdigitaldata,thenyoucanusevideodecoderlikeADV7189,ADV7183A.Andforencoder,youcanuseADV717x(SDTV,ADV719x(somesupportprogressivescanvideo,ADV73xx(supportHDTV.ADIadvantageishighoversamplerate,highSNR,noisefigure.
IfyouwanttoconvertRGBfromdigitaltoanalogRGB,thenADV7123/7/8ischoices.
IfyouwanttoconvertCVBSdirectlytodigitaldatabytime,thengeneralpurposeADClikeAD9203,AD9200,AD9051as10bitresolution.YoucanalsouseAD922xas12bitsolution.[2003-10-3011:21:17]

[问：qin]多通道的DAC的通道匹配性能如何保证?
[答：Theresa]DAC-to-DACcrosstalkisdefinedastheglitchimpulsethatappearsattheoutputofoneDACoutputduetoboththedigitalchangeandsubsequentanalogO/PchangeatanotherDAC.Thevictimchannelisloadedwithmidscale
andDAC-to-DACcrosstalkisspecifiedinnV-s.[2003-10-3011:22:51][问：wffae]请问贵公司的D/A一致性如何？我曾用过台湾多家D/A但产品的一致性差，在同样条件和环境下，输出的摸拟电压值有差异，不得不对每个产品作补偿调整。
[答：William]Thespecificationsareguaranteedinthedatasheet.YoucanrefertotheDCperformance(suchasoffsetandgainerrorforfurtherdetails.[2003-10-3011:23:44]
[问：qin]请介绍电源对高速DAC的噪音影响.是否需要用线性调整器而不用开关电源?如果用开关电源,对它的波纹如何进行处理?
[答：LiaoWS]Foranalogcircuits,linearpowersupplyisrequired.Butswitchedpowersupplycanbeusedifyoucanfilteritwell.Ifyouwanttofiltertheripplesinthepowersupply,yourweaponsarecapacitors,inductors.Formoredetails,sendmailtochina.support@analog.com,please.[2003-10-3011:23:57]
[问：qinqingzi]1MSPS的转换率，如果由外部提供时钟，会不会有不稳定之类的问题
[答：Jing]GeneralCrystalOscillatorcangenerateupto30MHzfrequency.Youcanuseaexternalclockandbeawaretothefiltercircuitandthestabilityofthevoltagereferencesource.[2003-10-3011:24:30][问：lwbence]DAC的一些相关指标在各个领域的应用中有没有一些标准，比如在通信领域的要求或是其它领域
[答：LiaoWS]ThespecificationsfortheDACisdifferentfromapplicationtoapplication.Forcommunicationsystems,therequirementistheSNR,SFDR,etc.Whicharemainlyfrequencydomainspecs.[2003-10-3011:25:30][问：ljp]如果8位DAC没有串行口,如何和串口的MCU相连接?是否要加串并转换?对这转换有何要求?
[答：Mariah]IftheMCUhasparallelport,youcanconnecttheDACtoMCU

directly.Ifyoujustwantstouseserialport,youshouldconvertparalleltoserial.Youshouldpayattentiontothelevelconsistencyoftheconversion.[2003-10-3011:26:58]
[问：wwenguang]DA的一个参数:MSPSUPDATERATE是什么意思,是不是最高的工作频率?
[答：LiaoWS]MSPSismillionsamplespersecond
UpdaterateisMSPSformanyconverters,excepttheSigma-Deltaones.Theyarenotmaximumworkingfrquency,theyarethefrequencythatconvertercanworknormally.Themaximumshouldbefasterthanthem.[2003-10-3011:27:01]
[问：hua_xing_jiang]请推荐几种用于通讯的转换器芯片。谢谢。[答：LiaoWS]Inwhihckindofwirelesssystem?
For3G,wehaveAD6644/5,AD6623/4,AD6634/6,AD6650/2,AD9777,AD9786andsoon.
Fordetails,contact8008101742,please.[2003-10-3011:28:06][问：kenvert.lee]刚才提到DAC的失效模式，请问，通常有哪些设计上的不当会导致DAC失效？DAC最容易损坏的是哪一部分？谢谢！
[答：Albert]Designsthatcannottoleratefailureincludemissioncriticalapplications,inmedical,militaryetc.Dacssectionspronetofailureinclude:
(athepowersupplypinsduetoovervoltagefromhighvoltagespikesonthepowersupplygeneratedfroninductiveswitchinginthesystemetc.(bInterfacelinesagainduetoovervoltage.(cOutputamplifierduetoESDandovervoltage
Allfailuremodesaregenerallyattributedtomisapplicationofthedevice.Generallywhenthedevicesareveryrobustwhenoperatedwithintheirabsolutemaxratings.[2003-10-3011:28:22]
[问：chenpld]在视频信号的DAC选择上，为达到广播级的质量，有什么要注意的？谢谢！
[答：Wayne]Basicallyyouneedtofollowbroadcastingstandardslocally.

Atfirst,youneedenoughoversamplerate,thenSNRtoreachoneoftherequirements.ADV719xcanbegoodchoice.ADV73xxisnewcomingfamilywhichhas108MSPSoreven216MSPSsamplerate.ADIhassomeotherproperitytechnologyinvideo,likeDNR,SSAFfilter,whichhelptoreachtherequirement.[2003-10-3011:29:23]
[问：ljp]5.串行DAC的时序控制较麻烦,和微控制器的I/O通信时间较长,除了改用并行DAC,还有什么好办法?
[答：LiaoWS]Forserialinterface,fewwireswillbeneeded.Itissuitableformulti-channelapplications.ForhighspeedDACs,mostofthemareparallelinterface.[2003-10-3011:29:54]
[问：zbchen69]如何考虑DNL和INL对转换精度的影响问题？在选择相关芯片时应如何考虑？
[答：William]DNLandINLrepresentthelinearityofthe
conversion.Dependingonyourapplication,youneedtodecidehowmucherroryoucanallowinthecodefromtheidealvalue.[2003-10-3011:31:04]
[问：421956]请问：用于直流伺服电机控制的DAC在精度与速度上一般选用什么类型的DAC比较好，是电压输出的，还是电流输出型的！
[答：Albert]AgainDACselectionishighlydependantonthesystemanditsrequirementswhichwilldeterminetheaccuracyandspeedoftheDAC.GenerallyvoltageoutputDACsareamorecompletesolution.IoutDACsgenerallycanonlysupply2mAmaxandrequireanexternalamplifierforcurrenttovoltageconversion.[2003-10-3011:32:37]
[问：wyhljb]在数模转换中，中间所经过的途径与通信中的数字信号和摸仪信号是同样的吗？？
转换中的干扰有那些要注意的？？？
[答：Mariah]Iamnotsureaboutthe"approach"meaning?Ifyouwantstogetmorehelp,pleasecalltoll-freenumber800-810-1742.[2003-10-3011:32:54]
[问：qin]如果降低温度对DAC性能的影响?或者提高温度使用范围?
[答：William]ManyDAC"scomewithareferenceinput.Thetemperatureperformancecanbeusuallyenhancedbyusinganexternal,lowtempco

referencetoextendthetemperaturerangeoftheDAC.Notethatallsemiconductorproductshavetemperaturegrade.Oneshouldnotuseaproductbeyondtherange.[2003-10-3011:33:13][问：ljp]ADI公司有没有ADC和DAC在同一封装里的产品?[答：Wayne]Forprecisonsolution,MicroconvertorserieslikeADuC81x/2x/3x/4xisgoodchoicewhichintegrateADC(12/16/24bit,200KSPS....,8051MCUand12bitDACsorPWMoutputinonechip.Forhighspeedsolution,youcanfindMxFEfamilyincludingAD986x,AD987xwhichhasbroadapplicationsinSTB,modem,communicationsystems.[2003-10-3011:33:44]
[问：qiangnet]能否推荐一个10M/8bit输出的D/A转换器？此外，深圳ADI的D/A转换器的负责人怎样联系？thanks!
[答：Jing]YoucanrefertoourAD5224,AD5225andAD5226.YoucancontactwithourShenzhenrepresentationat0755-83783430(Mr.ZhangXinming.[2003-10-3011:34:42]
[问：samire]单电源和双电源的DAC在性能有何区别?
[答：MelConway]Unipolar=singlesupplycomparedtoBipolar=dualsupplyDACs:
Unipolarischeaperandsimpler[only1powersupply],andissuitableforbatterypoweredequipment.Itistypicallylowerpower[asitusesonlyhalfthesuppliesofabipolarDAC].
Howeverthesignalhasnoground[unlessyousetupapseudoground,whichisnotoptimal]whichmakesitunsuitableforACandcontrol[+/-]typeapplications.Thevoltageswingontheoutputistypicallylessthanhalfthatofabipolaroutputwhichreducesthedynamicrange,SignaltoNoiseRatio,andthesizeoftheLeastSignificantBitLSBwhichmakesitunsuitableforhighprecision,highaccuracyapplications.AstheICIntegratedCircuithastowithstandmuchlowervoltages,thefeaturesizecanbereduced,reducingthediesizeandthereforecost.
BipolarDACsarenecessaryforAC,controlandanyhighprecisionorhighaccuracyapplicationswhreperformanceisimportant.ModernvoltagedoublerandinverterICs[basedonchargepumpsetc.]cangeneratethe

necessarynegativeandhighvoltagesforbipolarDACsatverylittlecostwhilstmaintainingalltheperformanceadvantages.
DependingontheapplicationaveryroughsplitwouldbetouseunipolarDACsat12bitsandbelow,andbipolarDACsat12bitsandabove,howevereverythingdependsontheactualapplication.
PleaseconatctourApplicationEngineerswhowillbehappytoexplainfurtherandmakepartrecommendations.[2003-10-3011:34:47][问：stick]能否解释一下DAC中INL，DNL，SFDR等指标
[答：LiaoWS]Pleasefindthemfrompage15ofthepresentation.Also,youcanfindtheirspecificationfromourdatasheets.Fordetails,pleasesendmailtochina.support@analog.com,theywillbehappytohelpyou.[2003-10-3011:35:23]
[问：snailman]请问，在精度要求很高的场合，在模数转换器的参考源选择及外围电路的设计上有哪些需要考虑的因素呢？比如是选用转换器自身提供的参考源好呢还是使用外部参考源好呢？谢谢
[答：William]Oneneedstouseahighperformancepowersupplyandreference.Boththepowersupplyandreferenceshouldbedecoupledtoaquietanaloggroundwithtwodecouplingcapacitors(oneforhighspeednoiseandoneforvoltagestability.Externalreferencetypicallyprovidesabetterperformance.[2003-10-3011:36:15]
[问：liuhuaker]主持人你好，请问DAC的转换速度是通过哪个参数体现的。[答：LiaoWS]youcanfindtheirMSPS,settlingtime.ForlowspeedDACs,itisimportanttoknowitssettlingtime.[2003-10-3011:36:21][问：WANGGYU]96khz音频输出可以选择贵公司的那种类型的DAC，请教国内常用的供货稳定的一种
[答：William]OurAD1853,AD1955,etc.cansupport96kHz.Infact,AD1955isoneofthebestaudioDACavailableonthemarket.[2003-10-3011:38:41]
[问：wffae]D/A输出电压会受负载的变化而受到影响吗？
[答：Mariah]Theoutputwillbeinfluencebytheload.Ifyoudriveaheavyload,youshouldaddabufferattheoutputoftheDAC.[2003-10-3011:39:08]

[问：lijianhong]怎样配置一个D/A电路，使输出为双极性电流？
[答：LiaoWS]Forbipolarvoltageoutput,youhavetoselecttherightkindofDAC.Anotherwayistousethebipolaramplifierstoimplementthecurrenttovoltageconversion.[2003-10-3011:39:11]
[问：nilibi]请问时钟抖动对DAC的影响有多大，有没有公式，谢谢[答：Theresa]JittercausesavoltageerrorwhichisafunctionofslewrateandresultsinanoveralldegradationofSNR.TheoreticalSNR=6N+1.76dBwhereN="resolution"[2003-10-3011:40:13]
[问：jikjikjik]有那些接口形式可选择?
[答：Mariah]Basicly,SPI,I2Cforserialportandparallelport.[2003-10-3011:40:45]
[问：jikjikjik]请问常用的关于声卡使用的DAC/ADC产品有那些?价格如何/谢谢
[答：William]WehaveafamilyofSoundMaxAC97codec(suchastheAD1885.Ifyouarelookingforgeneralpurposecodec,thenourAD73311orAD73322aresuitable.[2003-10-3011:41:13]
[问：wffae]D/A芯片的复位是什么意思？D/A芯片会复位吗？
[答：LiaoWS]Itmeansthatwhenpoweron,afixedlotagelevelwillbeset.TheresetfortheDACisusefulforsomeapplicaitons.[2003-10-3011:41:52]
[问：huhuizhu]WhatspecificationofDACcanpresentsthedifferenceofsettletimefromavoltageleveltoanotheroneondifferentvoltagelevel?[答：MelConway]ThisisacombinationofSettlingTimeandSlewRate.Settlingtimegivesthetimefortheoutputtostabilizegivenacertain[specified]stepsize[typicallyfullscale].Settlingtimecanrangefrom2-100usforVoltageoutputDACsto30-500nsforCurrentoutputDACs.Slewrateisthemaximumrateofchangeoftheoutput-example5V/usmeansthattheoutputcanchangeatotalof5Vin1microsecond[us].Iftheoutputwasat1Vitcouldmoveto3.5V[achangeof2.5V]in0.5us.[2003-10-3011:42:37]

[问：QZDZ]请介绍一下,现在DAC在虚拟仪器方面的应用情况
[答：Wayne]MostapplicationofDACinvirtueinstrumentshouldbemulti-channelDACs.So,AD53xx,AD54xx,AD55xxarebigfamilyforyourchoices.Forexmaple,AD5380canreach40channels14bit.While,AD5391is16channels12bitDAC,AD5392is8channels16bitDAC.[2003-10-3011:43:07]
[问：peng-kai]在DAC与放大器一起构成程序控制放大器时，除了精度位数以外，我应当还考虑写什麽技术指标。谢谢
[答：William]TheDCspecificationsareimportantinthisapplication.Oneshouldlookatoffset,gainerror,drift(iftemperatureisimportant,etc.[2003-10-3011:43:58]
[问：wffae]请问贵公司有集成温度补偿的D/A芯片吗？通常能保证的温度范围是多少？thanks!!
[答：LiaoWS]WehavenotthiskindofDACs.Wecaninsureourtemperaturerangefrom0-70degreetothemilitarystandard.[2003-10-3011:44:16][问：jikjikjik]请问那一类DAC适合做比精度较高的仪表器件?
[答：Theresa]ThemostsuitableDACsforhighprecisioninstrumentationaregenerallyDACswithgreaterthan12bitsresolution,16bitsresolutionisbestchoice.
BipolardacsorIoutDacsmaybegoodoptionsdependingonthecustomerrequirements.[2003-10-3011:44:35]
[问：lwbence]如果要想达到20bit以上的精度，对电源的要求如何（如果不考虑外部噪声，只考虑电源引入的），是不是只能用电池供电
[答：Jing]Wecanprovide16bitresolutionDACsuchasAD5543andAD5544now.Youcanusethebatteryorotherpowersupply.Butyoushouldpaymoreattentiontothedecouplingcircuitandthestabilityofthereference.Thanks![2003-10-3011:44:47]
[问：de88]选择转换器时,在EMC方面应注意哪些问题.
[答：Gary]AlotofEMCcompatibiltyisbasedonsystemdesignandnotjustcomponentselection.

PCBGrounding,LayoutanddecouplingofpowersupplieshaveabigeffectonSucceptabilityandEmissions.Systemshieldingalsohasabigimpactonthis.TherearealotofarticleswrittenondesigntechniquestominimiseEMC.pleasereadthefollowingarticleformoreinformation.


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