参数资料
型号: LTC2309CF#PBF
厂商: Linear Technology
文件页数: 2/26页
文件大小: 0K
描述: IC ADC 12BIT SAR 20-TSSOP
标准包装: 74
位数: 12
采样率(每秒): 14k
数据接口: I²C,串行
转换器数目: 1
功率耗散(最大): 15mW
电压电源: 单电源
工作温度: 0°C ~ 70°C
安装类型: 表面贴装
封装/外壳: 20-TSSOP(0.173",4.40mm 宽)
供应商设备封装: 20-TSSOP
包装: 管件
输入数目和类型: 8 个单端,单极;8 个单端,双极;4 个差分,单极;4 个差分,双极
配用: DC1337A-ND - BOARD SAR ADC LTC2309
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
相关PDF资料
PDF描述
MS3106R22-23S CONN PLUG 8POS STRAIGHT W/SCKT
CS5521-ASZR IC ADC 16BIT 2CH 20-SSOP
VI-27M-MX-S CONVERTER MOD DC/DC 10V 75W
VI-27L-MX-S CONVERTER MOD DC/DC 28V 75W
AD7812YRUZ-REEL7 IC ADC 10BIT 8-CHAN SRL 20-TSSOP
相关代理商/技术参数
参数描述
LTC2309CUF#PBF 功能描述:IC ADC 12BIT SAR 24-QFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率(每秒):1M 数据接口:串行,SPI? 转换器数目:1 功率耗散(最大):- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘(4x4) 包装:Digi-Reel® 输入数目和类型:8 个单端,单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6
LTC2309CUF#PBF 制造商:Linear Technology 功能描述:A/D Converter (A-D) IC
LTC2309CUF#TRPBF 功能描述:IC ADC 12BIT SAR 24-QFN RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率(每秒):45k 数据接口:串行 转换器数目:2 功率耗散(最大):315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC(0.295",7.50mm 宽) 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端,单极
LTC2309HF#PBF 功能描述:IC ADC 12BIT SAR 20-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1 系列:microPOWER™ 位数:8 采样率(每秒):1M 数据接口:串行,SPI? 转换器数目:1 功率耗散(最大):- 电压电源:模拟和数字 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:24-VFQFN 裸露焊盘 供应商设备封装:24-VQFN 裸露焊盘(4x4) 包装:Digi-Reel® 输入数目和类型:8 个单端,单极 产品目录页面:892 (CN2011-ZH PDF) 其它名称:296-25851-6
LTC2309HF#TRPBF 功能描述:IC ADC 12BIT SAR 20-TSSOP RoHS:是 类别:集成电路 (IC) >> 数据采集 - 模数转换器 系列:- 标准包装:1,000 系列:- 位数:16 采样率(每秒):45k 数据接口:串行 转换器数目:2 功率耗散(最大):315mW 电压电源:模拟和数字 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:28-SOIC(0.295",7.50mm 宽) 供应商设备封装:28-SOIC W 包装:带卷 (TR) 输入数目和类型:2 个单端,单极