ADI AD5940高精度电化学测量前端解决方案Word下载.docx
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ADI AD5940高精度电化学测量前端解决方案Word下载.docx
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TheAD5940operatesfroma2.8Vto3.6Vsupplyandisspecifiedoveratemperaturerangeof−40℃to+85℃.TheAD5940ispackagedina56-lead,3.6mm×
4.2mmWLCSPpackage.
AD5940主要特性:
Analoginput
16-bit,800kSPSADC
Voltage,current,andimpedancemeasurementcapability
Internalandexternalcurrentandvoltagechannels
Ultralowleakageswitchmatrixandinputmux
Inputbuffersandprogrammablegainamplifier
VoltageDACs
DualoutputvoltageDACwithanoutputrangeof0.2Vto2.4V
12-bitVBIAS0outputtobiaspotentiostat
6-bitVZERO0outputtobiasTIA
Ultralowpower:
1μA
1highspeed,12-bitDAC
Outputrangetosensor:
±
607mV
Programmablegainamplifieronoutputwithgainsettingsof2and0.05
Amplifiers,accelerators,andreferences
1lowpower,lownoisepotentiostatamplifiersuitableforpotentiostatbiasinelectrochemicalsensing
1lownoise,lowpowerTIA,suitableformeasuringsensorcurrentoutput
50pAto3mArangeProgrammableloadandgainresistorsforsensoroutput
Analoghardwareaccelerators
Digitalwaveformgenerator
Receivefilters
Compleximpedancemeasurement(DFT)engine
1highspeedTIAtohandlewidebandwidthinputsignalsfrom0.015Hzupto200kHz
Digitalwaveformgeneratorforgenerationofsinusoidandtrapezoidwaveforms2.5Vand1.82Vinternalreferencevoltagesources
Systemlevelpowersavings
Fastpower-upandpower-downanalogblocksfordutycycling
ProgrammableAFEsequencertominimizeworkloadofhostcontroller
6kBSRAMtopreprogramAFEsequences
Ultralowpowerpotentiostatchannel:
6.5μAofcurrentconsumptionwhenpoweredonandallotherblocksinhibernatemode
Smartsensorsynchronizationanddatacollection
Cycleaccuratecontrolofsensormeasurement
SequencercontrolledGPIOs
On-chipperipherals
SPIserialinput/output
Wake-uptimer
Interruptcontroller
Power
2.8Vto3.6Vsupply
1.82Vinput/outputcompliant
Power-onreset
HibernatemodewithlowpowerDACandpotentiostatamplifierpowereduptomaintainsensorbiasPackageandtemperaturerange
3.6mm×
4.2mm,56-ballWLCSP
Fullyspecifiedforoperatingtemperaturerangeof−40℃to+85℃
AD5940应用:
Electrochemicalmeasurements
Electrochemicalgassensors
Potentiostat/amperometric/voltammetry/cyclicvoltammetry
Bioimpedanceapplications
Skinimpedance
Bodyimpedance
Continuousglucosemonitoring
Batteryimpedance
图1.AD5940简化框图
图2.AD5940功能框图
图3.AD5940ADC核框图(IN+,REF,GND,和IN−内部节点)
图4.ADC输入通路基本框图
图5.开关矩阵框图-开关连接到高速DAC和高速TIA
图6.AD5940系统时钟架构图
图7.低频2线生物阻抗回路(最大带宽=300Hz)
图8.高频4线生物阻抗回路(最大带宽=200kHz)
图9.电位模式采用宽带宽AFE回路
图10.采用AD5940,AD8232和AD8233的身体组成和ECG系统解决方案
图11.采用AD5940的典型水分析应用
全生物电系统中AD5940和AD8233
TheAD5940isahighprecision,ultralowpower,analogfrontend(AFE)systemdesignedtoexciteandmeasurethecurrent,voltage,orimpedanceresponseofasensor.
TheAD5940featurestwohighprecisionmeasurementloops.Anultralowpower,sub1kHzloopandahighspeed,sub200kHzloopallowtheAD5940topreciselymeasuretheimpedanceofasensor.
ThisapplicationnotedetailshowtosetuptheAD5940andtheAD8233inafullbioelectricsystemthatcanperformelectrodermalactivity(EDA),bodyimpedanceanalysis(BIA),andelectrocardiogram(ECG)measurementsthroughthesamesetofelectrodes.
ThehardwareusedcontainstheAD5940evaluationkit;
whichincludestheEVAL-ADICUP3029Arm®
basedArduinoformfactormicrocontroller;
theEVAL-AD5940BIOZevaluationboard;
andtheAD5940ZtestboardshowninFigure12.
图12.AD5940评估板外形图
评估板包括:
•EVAL-ADICUP3029
•EVAL-AD5940BIOZ
•AD5940Ztestboard
•ECGcable
•MicroUSBtoUSBcable
图13.AD5940和AD8233的信号链图
图14.ECG模拟器连接到评估板示意图
图15.生物阻抗信号通路
优化AD5940的电化学测量
TheAD5940isspecificallydesignedforhighprecisionanalysisofelectrochemicalcells.ThisapplicationnotedetailshowtosetupandoptimizetheAD5940toperformelectrochemicalmeasurementsonatypicalelectrochemicalcell.
ThehardwareusedistheAD5940evaluationkit,whichincludestheEVAL-ADICUP3029Arm®
Cortex™-M3microcontroller-basedArduinoUnoformfactorandtheEVAL-AD5940ELCZ,showninFigure16.
ThefollowingliststheitemsincludedintheEVAL-AD5940ELCZevaluationkit.
•EVAL-AD5940ELCZevaluationboard
•EVAL-ADICUP3029evaluationboard
•MicroUSBtoUSBcable
•MicroUSBtocrocodileclipcable
图16.评估板EVAL-AD5940ELCZ插到EVAL-ADICUP3029连接图
图17.电化学电池连接到AD5940
图18.EIS框图,测量传感器
图19.测量RCAL
图20.传感器连接到SEO
图21.2线阻抗
1.EVAL-AD5940BIOZ生物电评估板
AD5940专为包括体阻分析(BIA)和皮肤电活动(EDA)在内的生物阻抗应用而设计。
该评估套件包括基于EVAL-ADICUP3029Arm®
Cortex™-M3微控制器的ArduinoUno外形板.EVAL-AD5940BIOZ生物电屏蔽板用来进行生物电测量,包括电化学活性(EDA),体阻抗分析(4线)(BIA),心电图(ECG)和体阻抗分析(2线)(BIOZ-2线)以及用于测量生物阻抗的AD5940和用于ECG测量的AD8233以及定制的微型USB-ECG卡扣连接器.
图22.EVAL-AD5940BIOZ生物电屏蔽板外形图
图23.EVAL-AD5940BIOZ生物电屏蔽板电路图
(1)
图24.EVAL-AD5940BIOZ生物电屏蔽板电路图
(2)
图25.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图
(1)
图26.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图
(2)
图27.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图(3)
图28.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图(4)
图29.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图(5)
图30.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图(6)
图31.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图(7)
图32.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图(8)
图33.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图(9)
图34.EVAL-AD5940BIOZ生物电屏蔽板PCB设计图(10)
2.电化学测量评估板EVAL-AD5940ELCZ
AD5940专门用于对电化学电池进行高精度分析。
该评估套件旨在轻松配置AD5940,以便在典型的电化学电池上进行电化学测量。
Cortex™-M3微控制器的ArduinoUno外形板、EVAL-AD5940ELCZ子板以及定制微型USB到鳄鱼线缆,用于将硬件连接到各种化学装置。
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