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FEATURESDESCRIPTION
应用程序
24−Bit
adc
数字
过滤器
内部
监测
16:1
模拟
输入
mux
1
16
AINCOM
…
adc
入点
Extclk
入点/出点
AVSS DGND
AVDD DVDD
m UX
出点
SPI
接口
cs
drdy
SCLK
din
斗t
ControlOscillator
gpio
st艺术
重置
pwDN
gpio[7:0]v
参考
ADS1258
模拟 输入
ADS1258
SBAS297A–JUNE2005–REVISEDSEPTEMBER2005
16-频道,24-bitanalog-至-digitalconverter
•
24bits,nomissingcodes
theads1258isa16-频道(多路复用),
低噪声,24-有点,三角洲-西格玛(
∆Σ
)模拟-至-数字
•
固定-channelorautomaticchannelscan
变频器(adc)thatprovidessingle-cyclesettled
•
固定-channeldatarate:125ksps
dataatchannelscanratesfrom1.8kto23.7k
•
自动-scandatarate:23.7ksps
samplespersecond(sps).aflexibleinput
•
单独-conversionsettleddata
multiplexeracceptscombinationsofeightdifferential
or16single-endedinputswithafull-scaledifferential
•
16single-endedor8differentialinputs
rangeof5Vortruebipolarrangeof
±
2.5vwhen
•
单极(+5v)orbipolar(
±
2.5v)操作
operatingwitha5vreference.thefourth-订单
•
低噪声:2.8µv
rms
at1.8ksps
三角洲-sigmamodulatorisfollowedbyafifth-ordersinc
digitalfilteroptimizedforlow-noiseperformance.
•
0.0003%integralnonlinearity
•
dcstability(典型):
Thedifferentialoutputofthemultiplexerisaccessible
toallowsignalconditioningpriortotheinputofthe
0.02µv/
°
coffsetdrift,0.4ppm/
°
CGainDrift
adc.internalsystemmonitorregistersprovide
•
打开-sensordetection
supplyvoltage,温度,referencevoltage,增益,
•
conversioncontrol(pinandcommands)
andoffsetdata.
•
MultiplexerOutputforExternalSignal
AnonboardPLLgeneratesthesystemclockfroma
调节
32.768khzcrystal,orcanbeoverriddenbyan
•
开启-chiptemperature,参考,偏移量,
externalclocksource.abufferedsystemclockoutput
增益,andsupplyvoltagereadback
(15.7mhz)isprovidedtodriveamicrocontrolleror
additionalconverters.
•
42mWPowerDissipation
Serialdigitalcommunicationishandledviaan
•
备用,睡眠,andpower-downmodes
spi™-compatibleinterface.asimplecommandword
•
8general-purposeinputs/产出(gpio)
structurecontrolschannelconfiguration,datarates,
•
32.768khzcrystaloscillatororexternalclock
digitali/o,monitorfunctions,等
Programmablesensorbiascurrentsourcescanbe
usedtobiassensorsorverifysensorintegrity.
•
医疗,航空电子设备,andprocesscontrol
TheADS1258operatesfromaunipolar+5Vor
•
MachineandSystemMonitoring
双极性
±
2.5vanalogsupplyandadigitalsupply
•
fastscanmulti-channelinstrumentation
compatiblewithinterfacesrangingfrom2.7vto
•
IndustrialProcessControls
5.25v.theads1258isavailableinaqfn-48
•
TestandMeasurementSystems
包装.
pleasebeawarethatanimportantnoticeconcerningavailability,标准保修,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
spiisatrademarkofmotorola,公司
alltrademarksarethepropertyoftheirrespectiveowners.
productiondatainformationiscurrentasofpublicationdate.
copyright©2005,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
必要包括测试所有参数.
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