用1美元的模数转换器数字化一个1000美元的传感器

随着制造商推出32bit的高精度ADC，如何选择8位和32位ADC变得令人迷茫。LTC2450是一款比许多其他12位的ADC更经济的器件，只占用很小的板面积，成本更低。Digitizea$1000Sensorwitha$1Analog-to-DigitalConverterDesignNote456MarkThorenIntroductionpressure.ThespikesattheendofthegrapharefromTheLTC2450isa16-bit,single-endedinput,delta-adooropeningandclosing.TheSetra270mustbesigmaADCina2mm×2mmDFNpackage,butdon’ttreatedasa4-terminaldevice,asthenegativeoutputletitssmallsizeandlowcostfoolyou.TheLTC2450isnominally5Vabovethenegativeexcitation.FigurehasimpressiveDCspecs,including2LSBINL,2LSB3showsanisolatedsupplyforthesensor’sexcitation,offsetanda0.01