WhenusingafilterwithalargeCFILTERvalue(e.g.1F)" />
參數(shù)資料
型號(hào)： LTC2309IUF#PBF
廠商： Linear Technology
文件頁數(shù)： 4/26頁
文件大小： 0K
描述： IC ADC 12BIT SAR 24-QFN
標(biāo)準(zhǔn)包裝： 91
位數(shù)： 12
采樣率（每秒）： 14k
數(shù)據(jù)接口： I²C，串行
轉(zhuǎn)換器數(shù)目： 1
功率耗散（最大）： 15mW
電壓電源： 單電源
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 24-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 24-QFN 裸露焊盤（4x4）
包裝： 管件
輸入數(shù)目和類型： 8 個(gè)單端，單極；8 個(gè)單端，雙極；4 個(gè)差分，單極；4 個(gè)差分，雙極
產(chǎn)品目錄頁面： 1349 (CN2011-ZH PDF)
配用： DC1337A-ND - BOARD SAR ADC LTC2309
LTC2309
2309fd
AppLICAtIOns InFORMAtIOn
WhenusingafilterwithalargeCFILTERvalue(e.g.1F),
theinputsdonotcompletelysettleandthecapacitive
inputswitchingcurrentsareaveragedintoanetDC
current(IDC).Inthiscase,theanaloginputcanbemod-
eledbyanequivalentresistance(REQ=1/(fSMPLCIN))
inserieswithanidealvoltagesource(VREFCOMP/2),as
showninFigure3b.ThemagnitudeoftheDCcurrent
isthenapproximatelyIDC=(VIN–VREFCOMP/2)/REQ,
whichisroughlyproportionaltoVIN.Topreventlarge
DCdropsacrosstheresistorRFILTER,afilterwithasmall
resistorandlargecapacitorshouldbechosen.When
runningatthemaximumthroughputrateof14ksps,
theinputcurrentequals1.5AatVIN=4.096V,which
amountstoafull-scaleerrorof0.5LSBwhenusinga
filterresistor(RFILTER)of333.Applicationsrequiring
lowersampleratescantoleratealargerfilterresistor
forthesameamountoffull-scaleerror.
selfheatingandfromdamagethatmayoccurduring
soldering.Metalfilmsurfacemountresistorsaremuch
lesssusceptibletobothproblems.
Dynamic Performance
FastFourierTransform(FFT)testtechniquesareusedto
testtheADC’sfrequencyresponse,distortionandnoise
attheratedthroughput.Byapplyingalowdistortion
sinewaveandanalyzingthedigitaloutputusinganFFT
algorithm,theADC’sspectralcontentcanbeexamined
forfrequenciesoutsidethefundamental.
Signal-to-Noise and Distortion Ratio (SINAD)
Thesignal-to-noiseanddistortionratio(SINAD)isthe
ratiobetweentheRMSamplitudeofthefundamental
inputfrequencytotheRMSamplitudeofallotherfre-
quencycomponentsattheA/Doutput.Theoutputis
band-limitedtofrequenciesfromaboveDCandbelow
halfthesamplingfrequency.Figure5showsatypical
SINADof73.3dBwitha14kHzsamplingrateanda
1kHzinput.AnSNRof73.4dBcanbeachievedwith
theLTC2309.
VIN
INPUT
CH0-CH7
RON
100
CIN
55pF
CFILTER
RSOURCE
2309 F03a
LTC2309
Figure 3a. Analog Input Equivalent Circuit
VIN
INPUT
CH0-CH7
REQ
1/(fSMPL CIN)
VREFCOMP/2
CFILTER
RFILTER IDC
2309 F03b
LTC2309
+–
Figure 3b. Analog Input Equivalent
Circuit for Large Filter Capacitances
Figures4aand4bshowexamplesofinputfilteringfor
single-ended and differential inputs. For the single-
endedcaseinFigure4a,a50sourceresistoranda
2000pFcapacitortogroundontheinputwilllimitthe
inputbandwidthto1.6MHz.Highqualitycapacitorsand
resistorsshouldbeusedintheRCfiltersincethese
componentscanadddistortion.NPOandsilvermica
typedielectriccapacitorshaveexcellentlinearity.Carbon
surfacemountresistorscangeneratedistortionfrom
2309 F04a
CH0
COM
LTC2309
REFCOMP
2000pF
0.1F
10F
50
ANALOG
INPUT
Figure 4a. Optional RC Input Filtering for Single-Ended Input
1000pF
2309 F04b
CH0
CH1
LTC2309
REFCOMP
1000pF
0.1F
10F
50
DIFFERENTIAL
ANALOG
INPUTS
Figure 4b. Optional RC Input Filtering for Differential Inputs
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