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參數資料
| 型號： | LTC1403AIMSE-1#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | ADC |
| 英文描述： | Serial 12-Bit, 2.8Msps Sampling ADCs with Shutdown; Package: MSOP; No of Pins: 10; Temperature Range: -40°C to +85°C |
| 中文描述： | 1-CH 14-BIT PROPRIETARY METHOD ADC, SERIAL ACCESS, PDSO10 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-10 |
| 文件頁數： | 4/22頁 |
| 文件大?。?/td> | 575K |
| 代理商： | LTC1403AIMSE-1#TRPBF |
LTC1403-1/LTC1403A-1
14031fb
applications inFormation
INPUT FILTERING AND SOURCE IMPEDANCE
Thenoiseandthedistortionoftheinputamplifierand
othercircuitrymustbeconsideredsincetheywilladd
totheLTC1403-1/LTC1403A-1noiseanddistortion.The
small-signalbandwidthofthesample-and-holdcircuitis
50MHz.Anynoiseordistortionproductsthatarepres-
entattheanaloginputswillbesummedoverthisentire
bandwidth.Noisyinputcircuitryshouldbefilteredprior
totheanaloginputstominimizenoise.Asimple1-pole
RCfilterissufficientformanyapplications.Forexample,
Figure1showsa47pFcapacitorfromAIN+togroundanda
51Ωsourceresistortolimittheinputbandwidthto47MHz.
The47pFcapacitoralsoactsasachargereservoirforthe
inputsample-and-holdandisolatestheADCinputfrom
sampling-glitchsensitivecircuitry.Highqualitycapacitors
andresistorsshouldbeusedsincethesecomponents
can add distortion. NPO and silvermica type dielectric
capacitorshaveexcellentlinearity.Carbonsurfacemount
resistorscangeneratedistortionfromselfheatingand
fromdamagethatmayoccurduringsoldering.Metalfilm
surfacemountresistorsaremuchlesssusceptibletoboth
problems.Whenhighamplitudeunwantedsignalsareclose
infrequencytothedesiredsignalfrequency,amultiple
polefilterisrequired.Highexternalsourceresistance,
combinedwiththe13pFofinputcapacitance,willreduce
therated50MHzbandwidthandincreaseacquisitiontime
beyond39ns.
Figure 1. RC Input Filter
±1.25VrangeisalsoideallysuitedforAC-coupledsignals
insinglesupplyapplications.Figure2showshowtoAC
couplesignalsinasinglesupplysystemwithoutneeding
amid-supply1.5Vexternalreference.TheDCcommon
modelevelissuppliedbythepreviousstagethatisalready
boundedbythesinglesupplyvoltageofthesystem.The
commonmoderangeoftheinputsextendfromground
tothesupplyvoltageVDD.Ifthedifferencebetweenthe
AIN+andAIN–inputsexceeds1.25V,theoutputcodewill
stayfixedatzeroandallonesandifthisdifferencegoes
below–1.25V,theoutputcodewillstayfixedatoneand
allzeros.
10F
VCM
1.5V DC
11
3
AIN–
LTC1403-1/
LTC1403A-1
AIN+
47pF
2
1
51
GND
VREF
1403A F01
+
AIN+
C4
10F
14031 F02
R2
1.6k
C2
1F
C1
1F
C1, C2: FILM TYPE
C3: COG TYPE
C4: CERAMIC BYPASS
R1
1.6k
1
2
3
LTC1403-1/
LTC1403A-1
AIN–
VREF
R3
51
C3
56pF
VIN
Figure 2. AC Coupling of AC Signals with 1kHz Low Cut
INPUT RANGE
TheanaloginputsoftheLTC1403-1/LTC1403A-1maybe
drivenfullydifferentiallywithasinglesupply.Eachinput
may swing up to 3VP-Pindividually.Intheconversion
range,eachinputisalwaysupto1.25Vmorepositiveor
morenegativethantheinvertinginputofeachchannel.The
INTERNAL REFERENCE
TheLTC1403-1/LTC1403A-1hasanon-chip,temperature
compensated,bandgapreferencethatisfactorytrimmed
near 2.5V to obtain ±1.25V input span. The reference
amplifier output VREF, (Pin 3) must be bypassed with
acapacitortoground.Thereferenceamplifierisstable
withcapacitorsof1Forgreater.Forthebestnoiseper-
formance,a10Fceramicora10Ftantaluminparallel
witha0.1Fceramicisrecommended.TheVREFpincan
be overdriven with an external reference as shown in
Figure3.Thevoltageoftheexternalreferencemustbe
higherthanthe2.5VoftheclassApull-upoutputofthe
Figure 3
GND
LTC1403-1/
LTC1403A-1
VREF
10F
11
3
3VREF
14031 F03
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相關代理商/技術參數 |
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| LTC1403CMSE | 功能描述:IC ADC 12BIT 2.8MSPS DIFF 10MSOP RoHS:否 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1,000 系列:- 位數:16 采樣率（每秒）:45k 數據接口:串行 轉換器數目:2 功率耗散（最大）:315mW 電壓電源:模擬和數字 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:28-SOIC（0.295"，7.50mm 寬） 供應商設備封裝:28-SOIC W 包裝:帶卷 (TR) 輸入數目和類型:2 個單端，單極 |
| LTC1403CMSE#PBF | 功能描述:IC ADC 12BIT 2.8MSPS 10-MSOP RoHS:是 類別:集成電路 (IC) >> 數據采集 - 模數轉換器 系列:- 標準包裝:1 系列:microPOWER™ 位數:8 采樣率（每秒）:1M 數據接口:串行，SPI? 轉換器數目:1 功率耗散（最大）:- 電壓電源:模擬和數字 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:24-VFQFN 裸露焊盤 供應商設備封裝:24-VQFN 裸露焊盤（4x4） 包裝:Digi-Reel® 輸入數目和類型:8 個單端，單極 產品目錄頁面:892 (CN2011-ZH PDF) 其它名稱:296-25851-6 |
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