參數(shù)資料
型號： DC1337A
廠商： Linear Technology
文件頁數(shù)： 2/26頁
文件大小： 0K
描述： BOARD SAR ADC LTC2309
軟件下載： QuikEval System
設(shè)計資源： DC1337A Design File
DC1337A Schematic
標(biāo)準(zhǔn)包裝： 1
系列： QuikEval™
ADC 的數(shù)量： 1
位數(shù)： 12
采樣率（每秒）： 14k
數(shù)據(jù)接口： I²C，串行
在以下條件下的電源（標(biāo)準(zhǔn)）： 1.5mW @ 1kSPS
已用 IC / 零件： LTC2309
已供物品： 板
相關(guān)產(chǎn)品： LTC2309IUF#TRPBF-ND - IC ADC 12BIT SAR 24-QFN
LTC2309IF#TRPBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309IF#PBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309HF#TRPBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309HF#PBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309CUF#TRPBF-ND - IC ADC 12BIT SAR 24-QFN
LTC2309CF#TRPBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309CF#PBF-ND - IC ADC 12BIT SAR 20-TSSOP
LTC2309IUF#PBF-ND - IC ADC 12BIT SAR 24-QFN
LTC2309CUF#PBF-ND - IC ADC 12BIT SAR 24-QFN
LTC2309
0
2309fd
AppLICAtIOns InFORMAtIOn
Overview
TheLTC2309isalownoise,8-channel,12-bitsucces-
siveapproximationregister(SAR)A/Dconverterwithan
I2Ccompatibleserialinterface.TheLTC2309includesa
precisioninternalreferenceandaconfigurable8-chan-
nelanaloginputmultiplexer(MUX).TheADCmaybe
configuredtoacceptsingle-endedordifferentialsignals
andcanoperateineitherunipolarorbipolarmode.A
sleepmodeoptionisalsoprovidedtofurtherreduce
powerduringinactiveperiods.
The LTC2309 communicates through a 2-wire I2C
compatibleserialinterface.Conversionsareinitiated
bysignalingaSTOPconditionaftertheparthasbeen
successfullyaddressedforaread/writeoperation.The
devicewillnotacknowledge(NACK)anexternalrequest
untiltheconversionisfinished.Afteraconversionis
finished, the device is ready to accept a read/write
request. Once the LTC2309 is addressed for a read
operation, the device begins outputting the conver-
sionresultunderthecontroloftheserialclock(SCL).
Thereisnolatencyintheconversionresult.Thereare
12bitsofoutputdatafollowedby4trailingzeros.Data
isupdatedonthefallingedgesofSCL,allowingthe
usertoreliablylatchdataontherisingedgeofSCL.A
writeoperationmayfollowthereadoperationbyusing
arepeatSTARToraSTOPconditionmaybegivento
startanewconversion.Byselectingawriteoperation,
theADCcanbeprogrammedwitha6-bitDINword.The
DINwordconfigurestheMUXandprogramsvarious
modesofoperationoftheADC.
During a conversion, the internal 12-bit capacitive
chargeredistributionDACoutputissequencedthrough
asuccessiveapproximationalgorithmbytheSARstart-
ingfromthemostsignificantbit(MSB)totheleast
significantbit(LSB).Thesampledinputissuccessively
comparedwithbinaryweightedchargessuppliedby
thecapacitiveDACusingadifferentialcomparator.At
theendofaconversion,theDACoutputbalancesthe
analoginput.TheSARcontents(a12-bitdataword)
thatrepresentthesampledanaloginputareloadedinto
12outputlatchesthatallowthedatatobeshiftedout
viatheI2Cinterface.
Programming the LTC2309
ThevariousmodesofoperationoftheLTC2309are
programmedbya6-bitDINword.TheSDIinputdata
bitsareloadedontherisingedgeofSCLduringawrite
operation,withtheS/Dbitloadedonthefirstrisingedge
andtheSLPbitonthesixthrisingedge(seeFigure8b
intheI2CInterfacesection).Theinputdatawordis
definedasfollows:
S/D O/S S1 S0 UNI SLP
S/D=SINGLE-ENDED/DIFFERENTIALBIT
O/S=ODD/SIGNBIT
S1=CHANNELSELECTBIT1
S0=CHANNELSELECTBIT0
UNI=UNIPOLAR/BIPOLARBIT
SLP=SLEEPMODEBIT
Analog Input Multiplexer
The analog input MUX is programmed by the S/D,
O/S,S1andS0bitsoftheDINword.Table1liststhe
MUXconfigurationsforallcombinationsofthecon-
figurationbits.Figure1ashowsseveralpossibleMUX
configurationsandFigure1bshowshowtheMUXcan
bereconfiguredfromoneconversiontothenext.
Driving the Analog Inputs
TheanaloginputsoftheLTC2309areeasytodrive.
Eachoftheanaloginputscanbeusedasasingle-ended
inputrelativetotheCOMpin(CH0-COM,CH1-COM,
etc.)orindifferentialinputpairs(CH0andCH1,CH2
andCH3,CH4andCH5,CH6andCH7).Figure2shows
howtodriveCOMforsingle-endedinputsinunipolar
andbipolarmodes.RegardlessoftheMUXconfigura-
tion,the“+”and“–”inputsaresampledatthesame
instant.Anyunwantedsignalthatiscommontoboth
inputswillbereducedbythecommonmoderejection
ofthesample-and-holdcircuit.Theinputsdrawonly
onesmallcurrentspikewhilechargingthesample-and-
holdcapacitorsduringtheacquiremode.Inconversion
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參數(shù)描述
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