ADIAD7768八路同时取样ΣΔADC解决方案Word文档格式.docx

ADIAD7768八路同时取样ΣΔADC解决方案Word文档格式.docx

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TheAD7768hasthreemodes:

fastmode（256kSPSmaximum,110.8kHzinputbandwidth,51.5mWperchannel）,medianmode（128kSPSmaximum,55.4kHzinputbandwidth,27.5mWperchannel）andecomode（32kSPSmaximum,13.8kHzinputbandwidth,9.375mWperchannel）. 

TheAD7768offersextensivedigitalfilteringcapabilities,suchasawideband,low±

0.005dBpass-bandripple,antialiasinglow-passfilterwithsharprolloff,and105dBattenuationattheNyquistfrequency. 

Frequencydomainmeasurementscanusethewidebandlinearphasefilter.Thisfilterhasaflatpassband（±

0.005dBripple）fromdcto102.4kHzat256kSPS,fromdcto51.2kHzat128kSPS,orfromdcto12.8kHzat32kSPS. 

TheAD7768alsoofferssincresponseviaasinc5filter,alowlatencypathforlowbandwidth,andlownoisemeasurements.

Thewidebandandsinc5filterscanbeselectedandrunonaperchannelbasis. 

Withinthesefilteroptions,theusercanimprovethedynamicrangebyselectingfromdecimationratesof×

32,×

64,×

128,×

256,×

512,and×

1024.Theabilitytovarythedecimationfilteringoptimizesnoiseperformancetotherequiredinputbandwidth. 

EmbeddedanalogfunctionalityoneachADCchannelmakesdesigneasier,suchasaprechargebufferoneachanaloginputthatreducesanaloginputcurrentandaprechargereferencebufferperchannelreducesinputcurrentandglitchesonthereferenceinputterminals. 

Thedeviceoperateswitha5VAVDD1AandAVDD1Bsupply,a2.25Vto5.0VAVDD2AandAVDD2Bsupply,anda2.5Vto3.3Vor1.8VIOVDDsupply（seethe1.8VIOVDDOperationsectionforspecificrequirementsforoperatingat1.8VIOVDD）. 

Forthepurposesofclaritywithinthisdocument,theAVDD1AandAVDD1BsuppliesarereferredtoasAVDD1andtheAVDD2AandAVDD2BsuppliesarereferredtoasAVDD2.Forthenegativesupplies,AVSSisusedtorefertoAVSS1A,AVSS1B,AVSS2A,AVSS2B,andallotherAVSSpins. 

Thespecifiedoperatingtemperaturerangeis−40℃to+105℃.Thedeviceishousedina12mm×

12mm,64-leadLQFPpackage. 

Throughoutthisdatasheet,multifunctionpins,suchasXTAL2/MCLK,arereferredtoeitherbytheentirepinnameorbyasinglefunctionofthepin,forexampleMCLK,whenonlythatfunctionisrelevant.

AD7768主要特性:

Precisionacanddcperformance 

8-channelsimultaneoussampling

256kSPSADCoutputdatarateperchannel 

108dBdynamicrange 

110.8kHzinputbandwidth（−3dBbandwidth（BW）） 

−120dBTHDtypical 

±

2ppmINL,±

50μVoffseterror,±

30ppmgainerror 

Optimizedpowerdissipationvs.noisevs.inputbandwidth 

Selectablepower,speed,andinputbandwidth 

Fast:

highestspeed;

110.8kHzBW,51.5mWperchannel 

Median:

halfspeed,55.4kHzBW,27.5mWperchannel 

Eco:

lowestpower,13.8kHzBW,9.375mWperchannel 

InputBWrange:

dcto110.8kHz

Programmableinputbandwidth/samplingrates 

Cyclicredundancycheck（CRC）errorcheckingondatainterface 

Daisy-chaining

Linearphasedigitalfilter 

Lowlatencysinc5filter 

Widebandbrickwallfilter:

±

0.005dBrippleto102.4kHz 

Analoginputprechargebuffers 

Powersupply

AVDD1=5V,AVDD2=2.25Vto5V

IOVDD=2.5Vto3.3VorIOVDD=1.8V 

64-leadLQFPpackage,nopad 

Temperaturerange:

−40℃to+105℃ 

AD7768应用:

Dataacquisitionsystems:

USB/PXI/Ethernet 

Instrumentationandindustrialcontrolloops 

Audiotestandmeasurement 

Vibrationandassetconditionmonitoring 

3-phasepowerqualityanalysis 

Sonar 

HighprecisionmedicalEEG/EMG/ECG

图1.AD7768功能框图

图2.AD7768典型连接图评估板EVAL-AD7768FMCZTheEVAL-AD7768FMCZevaluationkitfeaturestheAD776824-bit,256kSPS,analog-to-digitalconverter（ADC）.A7Vto9Vexternalbenchtopsupplyisregulatedto5Vand3.3VtosupplytheAD7768andsupportponents.TheEVAL-AD7768FMCZboardconnectstotheUSBportofthePCviaaconnectiontotheEVAL-SDP-CH1Zmotherboard. 

TheAD7768evaluationsoftwarefullyconfigurestheAD7768deviceregisterfunctionalityandprovidesdcandactimedomainanalysisintheformofwaveformgraphs,histograms,andassociatednoiseanalysisforADCperformanceevaluation.

TheEVAL-AD7768FMCZisanevaluationboardthatallowstheusertoevaluatethefeaturesoftheADC.TheuserPCsoftwareexecutablecontrolstheAD7768overUSBthroughtheEVAL-SDP-CH1ZSystemDemonstrationPlatform（SDP）.

FullspecificationsontheAD7768areavailableintheproductdatasheet,whichshouldbeconsultedinconjunctionwithuserguideUG-917whenworkingwiththeevaluationboard.

评估板EVAL-AD7768FMCZ主要特点:

FullfeaturedevaluationboardfortheAD7768

PCcontrolinconjunctionwiththeSDP-H1SystemDemonstrationPlatform（EVAL-SDP-CH1Z）

PCsoftwarecontrolanddataanalysis 

Timeandfrequencydomain

Standalonehardwarecapability

图3.评估板EVAL-AD7768FMCZ外形图

图4.评估板EVAL-AD7768FMCZ电路图

（1）

图5.评估板EVAL-AD7768FMCZ电路图

（2）

图6.评估板EVAL-AD7768FMCZ电路图（3）

图7.评估板EVAL-AD7768FMCZ电路图（4）

图8.评估板EVAL-AD7768FMCZ电路图（5）

图9.评估板EVAL-AD7768FMCZ电路图（6）

图10.评估板EVAL-AD7768FMCZ电路图（7）

图11.评估板EVAL-AD7768FMCZPCB设计图

（1）

图12.评估板EVAL-AD7768FMCZPCB设计图

（2）

图13.评估板EVAL-AD7768FMCZPCB设计图（3）

图14.评估板EVAL-AD7768FMCZPCB设计图（4）

图15.评估板EVAL-AD7768FMCZPCB设计图（5）

图16.评估板EVAL-AD7768FMCZPCB设计图（6）

图17.评估板EVAL-AD7768FMCZPCB设计图（7）

图18.评估板EVAL-AD7768FMCZPCB设计图（8）

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