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| 型号： | DC1337A |
| 厂商： | Linear Technology |
| 文件页数： | 2/26页 |
| 文件大小： | 0K |
| 描述： | BOARD SAR ADC LTC2309 |
| 软件下载： | QuikEval System |
| 设计资源： | DC1337A Design File DC1337A Schematic |
| 标准包装： | 1 |
| 系列： | QuikEval™ |
| ADC 的数量： | 1 |
| 位数： | 12 |
| 采样率（每秒）： | 14k |
| 数据接口： | I²C，串行 |
| 在以下条件下的电源（标准）： | 1.5mW @ 1kSPS |
| 已用 IC / 零件： | LTC2309 |
| 已供物品： | 板 |
| 相关产品： | 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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相关代理商/技术参数 |
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| DC1337A | 制造商:Linear Technology 功能描述:LTC2309: 12-BIT 8-CHANNEL SAR |
| DC1338A | 功能描述:BOARD DEMO LTC2990 RoHS:否 类别:编程器，开发系统 >> 评估演示板和套件 系列:QuikEval™ 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
| DC1338B | 制造商:Linear Technology 功能描述:BOARD EVAL FOR LTC2990 制造商:Linear Technology 功能描述:LTC2990 AMP / VOLT / TEMP MON 制造商:Linear Technology 功能描述:DEMO BOARD, LTC2990 POWER MONITOR; Silicon Manufacturer:Linear Technology; Silicon Core Number:LTC2990; Kit Application Type:Power Management; Application Sub Type:Power Monitor; Kit Contents:Demo Board LTC2990 |
| DC1339A | 功能描述:BOARD SAR ADC LTC2302 RoHS:是 类别:编程器，开发系统 >> 评估板 - 模数转换器 (ADC) 系列:QuikEval™ 产品培训模块:Obsolescence Mitigation Program 标准包装:1 系列:- ADC 的数量:1 位数:12 采样率（每秒）:94.4k 数据接口:USB 输入范围:±VREF/2 在以下条件下的电源（标准）:- 工作温度:-40°C ~ 85°C 已用 IC / 零件:MAX11645 已供物品:板，软件 |
| DC1342B | 制造商:Linear Technology 功能描述:DEV BOARD FOR LT3758AEMSE |
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