12-/14-Bit, 160/250MSPS, Ultralow-Power ADC - Texas Instruments

82 Pages·2016·2.33 MB·English

ADS4126, ADS4129
ADS4146, ADS4149
www.ti.com SBAS483G–NOVEMBER2009–REVISEDJANUARY2011
12-/14-Bit, 160/250MSPS, Ultralow-Power ADC
CheckforSamples:ADS4126,ADS4129,ADS4146,ADS4149
FEATURES DESCRIPTION
1
• MaximumSampleRate:250MSPS The ADS412x/4x are a family of 12-bit/14-bit
23
• UltralowPower with1.8VSingleSupply: analog-to-digital converters (ADCs) with sampling
rates up to 250MSPS. These devices use innovative
– 201mWTotal Powerat160MSPS
design techniques to achieve high dynamic
– 265mWTotal Powerat250MSPS
performance, while consuming extremely low power
• HighDynamicPerformance: at 1.8V supply. The devices are well-suited for
multi-carrier, wide bandwidth communications
– SNR:70.6dBFSat170MHz
applications.
– SFDR:84dBcat170MHz
The ADS412x/4x have fine gain options that can be
• DynamicPowerScalingwithSampleRate
used to improve SFDR performance at lower
• Output Interface:
full-scale input ranges, especially at high input
– DoubleDataRate(DDR)LVDS with frequencies. They include a dc offset correction loop
ProgrammableSwingand Strength that can be used to cancel the ADC offset. At lower
sampling rates, the ADC automatically operates at
– StandardSwing:350mV
scaleddownpower withnolossinperformance.
– LowSwing:200mV
The ADS412x/4x are available in a compact QFN-48
– DefaultStrength:100ΩTermination
package and are specified over the industrial
– 2xStrength:50ΩTermination temperaturerange(–40°Cto+85°C)
– 1.8VParallelCMOSInterfaceAlso
Supported
• ProgrammableGainupto6dBforSNR/SFDR
Trade-Off
• DCOffsetCorrection
• SupportsLowInputClockAmplitudeDownTo
200mV
PP
• Package:QFN-48(7mm×7mm)
ADS412x/ADS414xFamilyComparison
SAMPLINGRATE WITHANALOGINPUTBUFFERS
FAMILY 65MSPS 125MSPS 160MSPS 250MSPS 200MSPS 250MSPS
ADS412x
ADS4122 ADS4125 ADS4126 ADS4129 — ADS41B29
12-bitfamily
ADS414x
ADS4142 ADS4145 ADS4146 ADS4149 — ADS41B49
14-bitfamily
9-bit — — — — — ADS58B19
11-bit — — — — ADS58B18 —
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas
Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PowerPADisatrademarkofTexasInstrumentsIncorporated.
2
Allothertrademarksarethepropertyoftheirrespectiveowners.
3
PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2009–2011,TexasInstrumentsIncorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarilyincludetestingofallparameters.
ADS4126, ADS4129
ADS4146, ADS4149
SBAS483G–NOVEMBER2009–REVISEDJANUARY2011 www.ti.com
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore
susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
ORDERINGINFORMATION(1)
SPECIFIED
PACKAGE- PACKAGE TEMPERATURE LEAD/BALL PACKAGE ORDERING TRANSPORTMEDIA,
PRODUCT LEAD DESIGNATOR RANGE ECOPLAN(2) FINISH MARKING NUMBER QUANTITY
GREEN(RoHS,no ADS4126IRGZR Tapeandreel,2500
ADS4126 QFN-48 RGZ –40°Cto+85°C Cu/NiPdAu AZ4126
Sb/Br) ADS4126IRGZT Tapeandreel,250
GREEN(RoHS,no ADS4129IRGZR Tapeandreel,2500
ADS4129 QFN-48 RGZ –40°Cto+85°C Cu/NiPdAu AZ4129
Sb/Br) ADS4129IRGZT Tapeandreel,250
GREEN(RoHS,no ADS4146IRGZR Tapeandreel,2500
ADS4146 QFN-48 RGZ –40°Cto+85°C Cu/NiPdAu AZ4146
Sb/Br) ADS4146IRGZT Tapeandreel,250
GREEN(RoHS,no ADS4149IRGZR Tapeandreel,2500
ADS4149 QFN-48 RGZ –40°Cto+85°C Cu/NiPdAu AZ4149
Sb/Br) ADS4149IRGZT Tapeandreel,250
(1) Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orvisitthe
deviceproductfolderatwww.ti.com.
(2) EcoPlanistheplannedeco-friendlyclassification.Green(RoHS,noSb/Br):TIdefinesGreentomeanPb-Free(RoHScompatible)and
freeofBromine-(Br)andAntimony-(Sb)basedflameretardants.RefertotheQualityandLead-Free(Pb-Free)Datawebsiteformore
information.
The ADS412x/4x family is pin-compatible with the previous generation ADS6149 family; this architecture enables
easymigration.However,therearesomeimportantdifferencesbetweenthegenerations, summarizedin Table1.
Table1.MIGRATINGFROMTHEADS6149FAMILY
ADS6149FAMILY ADS4149FAMILY
PINS
Pin21isNC(notconnected) Pin21isNC(notconnected)
Pin23isMODE Pin23isRESERVEDintheADS4149family.Itisreservedasadigitalcontrolpinforan(asyet)undefinedfunctioninthe
next-generationADCseries.
SUPPLY
AVDDis3.3V AVDDis1.8V
DRVDDis1.8V Nochange
INPUTCOMMON-MODEVOLTAGE
VCMis1.5V VCMis0.95V
SERIALINTERFACE
Protocol:8-bitregisteraddressand8-bitregisterdata Nochangeinprotocol
Newserialregistermap
EXTERNALREFERENCEMODE
Supported Notsupported
ADS61B49FAMILY ADS41B29/B49/ADS58B18FAMILY
PINS
Pin21isNC(notconnected) Pin21is3.3VAVDD_BUF(supplyfortheanaloginputbuffers)
Pin23isadigitalcontrolpinfortheRESERVEDfunction.
Pin23isMODE
Pin23functionsasSNRBoostenable(B18only).
SUPPLY
AVDDis3.3V AVDDis1.8V,AVDD_BUFis3.3V
DRVDDis1.8V Nochange
INPUTCOMMON-MODEVOLTAGE
VCMis1.5V VCMis1.7V
SERIALINTERFACE
Nochangeinprotocol
Protocol:8-bitregisteraddressand8-bitregisterdata
Newserialregistermap
EXTERNALREFERENCEMODE
Supported Notsupported
2 SubmitDocumentationFeedback Copyright©2009–2011,TexasInstrumentsIncorporated
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149
ADS4126, ADS4129
ADS4146, ADS4149
www.ti.com SBAS483G–NOVEMBER2009–REVISEDJANUARY2011
ABSOLUTE MAXIMUM RATINGS(1)
Overoperatingfree-airtemperaturerange,unlessotherwisenoted.
VALUE UNIT
Supplyvoltagerange,AVDD –0.3to2.1 V
Supplyvoltagerange,DRVDD –0.3to2.1 V
VoltagebetweenAGNDandDRGND –0.3to0.3 V
VoltagebetweenAVDDtoDRVDD(whenAVDDleadsDRVDD) 0to2.1 V
VoltagebetweenDRVDDtoAVDD(whenDRVDDleadsAVDD) 0to2.1 V
INP,INM –0.3tominimum(1.9,AVDD+0.3) V
Voltageappliedtoinputpins CLKP,CLKM(2),DFS,OE –0.3toAVDD+0.3 V
RESET,SCLK,SDATA,SEN –0.3to3.9 V
Operatingfree-airtemperaturerange,T –40to+85 °C
A
Operatingjunctiontemperaturerange,T +125 °C
J
Storagetemperaturerange,T –65to+150 °C
stg
ESD,humanbodymodel(HBM) 2 kV
(1) Stressesabovetheseratingsmaycausepermanentdamage.Exposuretoabsolutemaximumconditionsforextendedperiodsmay
degradedevicereliability.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyond
thosespecifiedisnotimplied.
(2) WhenAVDDisturnedoff,itisrecommendedtoswitchofftheinputclock(orensurethevoltageonCLKP,CLKMislessthan|0.3V|.
ThispreventstheESDprotectiondiodesattheclockinputpinsfromturningon.
THERMAL INFORMATION
ADS4126,
ADS4129,
ADS4146,
THERMALMETRIC(1) ADS4149 UNITS
RGZ
48PINS
q Junction-to-ambientthermalresistance 29
JA
q Junction-to-case(top)thermalresistance
JCtop
q Junction-to-boardthermalresistance 10
JB
°C/W
y Junction-to-topcharacterizationparameter 0.3
JT
y Junction-to-boardcharacterizationparameter 9
JB
q Junction-to-case(bottom)thermalresistance 1.13
JCbot
(1) Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953.
Copyright©2009–2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 3
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149
ADS4126, ADS4129
ADS4146, ADS4149
SBAS483G–NOVEMBER2009–REVISEDJANUARY2011 www.ti.com
RECOMMENDED OPERATING CONDITIONS
Overoperatingfree-airtemperaturerange,unlessotherwisenoted.
ADS412x,ADS414x
MIN TYP MAX UNIT
SUPPLIES
AVDD Analogsupplyvoltage 1.7 1.8 1.9 V
DRVDD Digitalsupplyvoltage 1.7 1.8 1.9 V
ANALOGINPUTS
Differentialinputvoltagerange(1) 2 V
PP
Inputcommon-modevoltage V ±0.05 V
CM
Maximumanaloginputfrequencywith2V inputamplitude(2) 400 MHz
PP
Maximumanaloginputfrequencywith1V inputamplitude(2) 800 MHz
PP
CLOCKINPUT
Inputclocksamplerate
ADS4129/ADS4149
Low-speedmodeenabled(3) 20 80 MSPS
Low-speedmodedisabled(3) >80 250 MSPS
ADS4126/ADS4146
Low-speedmodeenabled(3) 20 80 MSPS
Low-speedmodedisabled(3) >80 160 MSPS
Inputclockamplitudedifferential(V –V )
CLKP CLKM
Sinewave,ac-coupled 0.2 1.5 V
PP
LVPECL,ac-coupled 1.6 V
PP
LVDS,ac-coupled 0.7 V
PP
LVCMOS,single-ended,ac-coupled 1.8 V
Inputclockdutycycle
Low-speedmodeenabled 40 50 60 %
Low-speedmodedisabled 35 50 65 %
DIGITALOUTPUTS
C MaximumexternalloadcapacitancefromeachoutputpintoDRGND 5 pF
LOAD
DifferentialloadresistancebetweentheLVDSoutputpairs(LVDS
R 100 Ω
LOAD mode)
T Operatingfree-airtemperature –40 +85 °C
A
HIGHPERFORMANCEMODES(4)(5)(6)
SettheMODE1registerbitstogetbestperformanceacrosssample
Mode1 clockandinputsignalfrequencies.
Registeraddress=03h,registerdata=03h
SettheMODE2registerbittogetbestperformanceathighinput
Mode2 signalfrequencies.
Registeraddress=4Ah,registerdata=01h
(1) With0dBgain.SeetheFineGainsectionintheApplicationInformationforrelationbetweeninputvoltagerangeandgain.
(2) SeetheTheoryofOperationsectionintheApplicationInformation.
(3) SeetheSerialInterfacesectionfordetailsonlow-speedmode.
(4) Itisrecommendedtousethesemodestogetbestperformance.Thesemodescanbesetusingtheserialinterfaceonly.
(5) SeetheSerialInterfacesectionfordetailsonregisterprogramming.
(6) Notethatthesemodescannotbesetwhentheserialinterfaceisnotused(whentheRESETpinistiedhigh);seetheDevice
Configurationsection.
4 SubmitDocumentationFeedback Copyright©2009–2011,TexasInstrumentsIncorporated
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149
ADS4126, ADS4129
ADS4146, ADS4149
www.ti.com SBAS483G–NOVEMBER2009–REVISEDJANUARY2011
ELECTRICAL CHARACTERISTICS: ADS4126/ADS4129
Typicalvaluesareat+25°C,AVDD=1.8V,DRVDD=1.8V,50%clockdutycycle,–1dBFSdifferentialanaloginput,1dBgain,
andDDRLVDSinterface,unlessotherwisenoted.Minimumandmaximumvaluesareacrossthefulltemperaturerange:
T =–40°CtoT =+85°C,AVDD=1.8V,andDRVDD=1.8V.Notethatafterreset,thedeviceisin0dBgainmode.
MIN MAX
ADS4126(160MSPS) ADS4129(250MSPS)
PARAMETER TESTCONDITIONS MIN TYP MAX MIN TYP MAX UNIT
Resolution 12 12 Bits
fIN=10MHz 70.2 69.8 dBFS
fIN=70MHz 70 69.7 dBFS
SNR(signal-to-noiseratio),LVDS fIN=100MHz 69.7 69.6 dBFS
fIN=170MHz 66.5 69 65.8 69 dBFS
fIN=300MHz 68 68 dBFS
fIN=10MHz 70.1 69.7 dBFS
fIN=70MHz 70 69.4 dBFS
SINAD(signal-to-noiseanddistortionratio),
LVDS fIN=100MHz 69.5 69.3 dBFS
fIN=170MHz 65.5 68.7 65.5 68.7 dBFS
fIN=300MHz 67.3 66.8 dBFS
fIN=10MHz 88 87 dBc
fIN=70MHz 87 82 dBc
Spurious-freedynamicrange SFDR fIN=100MHz 86.3 81 dBc
fIN=170MHz 72.5 82 70 80 dBc
fIN=300MHz 77.5 75 dBc
fIN=10MHz 87 85 dBc
fIN=70MHz 85 80 dBc
Totalharmonicdistortion THD fIN=100MHz 84 79 dBc
fIN=170MHz 70 81 69 79 dBc
fIN=300MHz 74.5 71.5 dBc
fIN=10MHz 92 90 dBc
fIN=70MHz 90 85 dBc
Second-harmonicdistortion HD2 fIN=100MHz 88 84 dBc
fIN=170MHz 72.5 88 70 84 dBc
fIN=300MHz 78 74 dBc
fIN=10MHz 88 87 dBc
fIN=70MHz 87 82 dBc
Third-harmonicdistortion HD3 fIN=100MHz 86 81 dBc
fIN=170MHz 72.5 82 70 80 dBc
fIN=300MHz 77 75 dBc
fIN=10MHz 92 90 dBc
fIN=70MHz 91 88 dBc
Worstspur
(otherthansecondandthirdharmonics) fIN=100MHz 90 90 dBc
fIN=170MHz 76 90 75 88 dBc
fIN=300MHz 88 88 dBc
f1=46MHz,f2=50MHz, –88 –88 dBFS
Two-toneintermodulation eachtoneat–7dBFS
IMD
distortion f1=185MHz,f2=190MHz, –86 –86 dBFS
eachtoneat–7dBFS
Recoverytowithin1%(offinal
Clock
Inputoverloadrecovery value)for6dBoverloadwith 1 1
cycles
sine-waveinput
ACpower-supplyrejectionratio PSRR For100mVPPsignalonAVDD >30 >30 dB
supply,upto10MHz
Effectivenumberofbits ENOB fIN=170MHz 11.2 11.2 LSBs
Differentialnonlinearity DNL fIN=170MHz –0.85 ±0.2 2.5 –0.95 ±0.2 2.5 LSBs
Integratednonlinearity INL fIN=170MHz ±0.25 3.5 ±0.5 5 LSBs
Copyright©2009–2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 5
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149
ADS4126, ADS4129
ADS4146, ADS4149
SBAS483G–NOVEMBER2009–REVISEDJANUARY2011 www.ti.com
ELECTRICAL CHARACTERISTICS: ADS4146/ADS4149
Typicalvaluesareat+25°C,AVDD=1.8V,DRVDD=1.8V,50%clockdutycycle,–1dBFSdifferentialanaloginput,1dBgain,
andDDRLVDSinterface,unlessotherwisenoted.Minimumandmaximumvaluesareacrossthefulltemperaturerange:
T =–40°CtoT =+85°C,AVDD=1.8V,andDRVDD=1.8V.Notethatafterreset,thedeviceisin0dBgainmode.
MIN MAX
ADS4146(160MSPS) ADS4149(250MSPS)
PARAMETER TESTCONDITIONS MIN TYP MAX MIN TYP MAX UNIT
Resolution 14 14 Bits
fIN=10MHz 72.2 71.9 dBFS
fIN=70MHz 72 71.4 dBFS
SNR(signal-to-noiseratio),LVDS fIN=100MHz 71.5 71.4 dBFS
fIN=170MHz 68.5 70.8 67.5 70.6 dBFS
fIN=300MHz 69 69 dBFS
fIN=10MHz 72 71.6 dBFS
fIN=70MHz 71.8 71 dBFS
SINAD(signal-to-noiseanddistortionratio),
LVDS fIN=100MHz 71.4 70.9 dBFS
fIN=170MHz 67.5 70.4 66 69.4 dBFS
fIN=300MHz 68.2 67.4 dBFS
fIN=10MHz 88 87 dBc
fIN=70MHz 87 82 dBc
Spurious-freedynamicrange SFDR fIN=100MHz 86 81 dBc
fIN=170MHz 74.5 82 72 84 dBc
fIN=300MHz 77 75 dBc
fIN=10MHz 86.5 85 dBc
fIN=70MHz 85 80 dBc
Totalharmonicdistortion THD fIN=100MHz 84 79 dBc
fIN=170MHz 72 81 71 80.5 dBc
fIN=300MHz 74.5 71.5 dBc
fIN=10MHz 91 89 dBc
fIN=70MHz 90 85 dBc
Second-harmonicdistortion HD2 fIN=100MHz 88 84 dBc
fIN=170MHz 74.5 88 72 84 dBc
fIN=300MHz 79 75 dBc
fIN=10MHz 88 87 dBc
fIN=70MHz 87 82 dBc
Third-harmonicdistortion HD3 fIN=100MHz 86 81 dBc
fIN=170MHz 74.5 82 72 82 dBc
fIN=300MHz 77 75 dBc
fIN=10MHz 91 90 dBc
fIN=70MHz 90 88 dBc
Worstspur
(otherthansecondandthirdharmonics) fIN=100MHz 90 90 dBc
fIN=170MHz 78 90 77 88 dBc
fIN=300MHz 88 88 dBc
f1=46MHz,f2=50MHz, –88 –88 dBFS
Two-toneintermodulation eachtoneat–7dBFS
IMD
distortion f1=185MHz,f2=190MHz, –86 –86 dBFS
eachtoneat–7dBFS
Recoverytowithin1%(offinal
Clock
Inputoverloadrecovery value)for6dBoverloadwith 1 1
cycles
sine-waveinput
ACpower-supplyrejectionratio PSRR For100mVPPsignalonAVDD >30 >30 dB
supply,upto10MHz
Effectivenumberofbits ENOB fIN=170MHz 11.5 11.3 LSBs
Differentialnonlinearity DNL fIN=170MHz –0.95 ±0.5 –0.95 ±0.5 LSBs
Integratednonlinearity INL fIN=170MHz ±2 ±4.5 ±2 ±5 LSBs
6 SubmitDocumentationFeedback Copyright©2009–2011,TexasInstrumentsIncorporated
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149
ADS4126, ADS4129
ADS4146, ADS4149
www.ti.com SBAS483G–NOVEMBER2009–REVISEDJANUARY2011
ELECTRICAL CHARACTERISTICS: GENERAL
Typicalvaluesareat+25°C,AVDD=1.8V,DRVDD=1.8V,50%clockdutycycle,and0dBgain,unlessotherwisenoted.
Minimumandmaximumvaluesareacrossthefulltemperaturerange:T =–40°CtoT =+85°C,AVDD=1.8V,and
MIN MAX
DRVDD=1.8V.
ADS4126/ADS4146(160MSPS) ADS4129/ADS4149(250MSPS)
PARAMETER MIN TYP MAX MIN TYP MAX UNIT
ANALOGINPUTS
Differentialinputvoltagerange 2 2 VPP
Differentialinputresistance(atdc);seeFigure114 >1 >1 MΩ
Differentialinputcapacitance;seeFigure115 4 4 pF
Analoginputbandwidth 550 550 MHz
Analoginputcommon-modecurrent(perinputpin) 0.6 0.6 µA/MSPS
Common-modeoutputvoltage VCM 0.95 0.95 V
VCMoutputcurrentcapability 4 4 mA
DCACCURACY
Offseterror –15 2.5 15 –15 2.5 15 mV
Temperaturecoefficientofoffseterror 0.003 0.003 mV/°C
Gainerrorasaresultofinternalreference
inaccuracyalone EGREF –2 2 –2 2 %FS
Gainerrorofchannelalone EGCHAN –0.2 –0.2 –1 %FS
TemperaturecoefficientofEGCHAN 0.001 0.001 Δ%/°C
POWERSUPPLY
IAVDD
72 83 99 113 mA
Analogsupplycurrent
IDRVDD(1)
Outputbuffersupplycurrent
39.5 51 47 mA
LVDSinterfacewith100Ωexternaltermination
LowLVDSswing(200mV)
IDRVDD
Outputbuffersupplycurrent
51 63 59 72 mA
LVDSinterfacewith100Ωexternaltermination
StandardLVDSswing(350mV)
IDRVDDoutputbuffersupplycurrent(1)(2)
CMOSinterface(2)
26 35 mA
8pFexternalloadcapacitance
fIN=2.5MHz
Analogpower 130 179 mW
LVDSinterface,lowLVDSswing 71.1 84.6 mW
Digitalpower
CMOSinterface(2)
47 63 mW
8pFexternalloadcapacitance
fIN=2.5MHz
Globalpower-down 10 25 10 25 mW
Standby 185 185 mW
(1) ThemaximumDRVDDcurrentwithCMOSinterfacedependsontheactualloadcapacitanceonthedigitaloutputlines.Notethatthe
maximumrecommendedloadcapacitanceoneachdigitaloutputlineis10pF.
(2) InCMOSmode,theDRVDDcurrentscaleswiththesamplingfrequency,theloadcapacitanceonoutputpins,inputfrequency,andthe
supplyvoltage(seetheCMOSInterfacePowerDissipationsectionintheApplicationInformation).
Copyright©2009–2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 7
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149
ADS4126, ADS4129
ADS4146, ADS4149
SBAS483G–NOVEMBER2009–REVISEDJANUARY2011 www.ti.com
DIGITAL CHARACTERISTICS
Typicalvaluesareat+25°C,AVDD=1.8V,DRVDD=1.8V,and50%clockdutycycle,unlessotherwisenoted.Minimumand
maximumvaluesareacrossthefulltemperaturerange:T =–40°CtoT =+85°C,AVDD=1.8V,andDRVDD=1.8V.
MIN MAX
ADS4126,ADS4129,ADS4146,ADS4149
PARAMETER TESTCONDITIONS MIN TYP MAX UNIT
DIGITALINPUTS(RESET,SCLK,SDATA,SEN,OE)
High-levelinputvoltage RESET,SCLK,SDATA,and 1.3 V
SENsupport1.8Vand3.3V
Low-levelinputvoltage CMOSlogiclevels 0.4 V
High-levelinputvoltage OEonlysupports1.8VCMOS 1.3 V
Low-levelinputvoltage logiclevels 0.4 V
High-levelinputcurrent:SDATA,SCLK(1) VHIGH=1.8V 10 µA
High-levelinputcurrent:SEN VHIGH=1.8V 0 µA
Low-levelinputcurrent:SDATA,SCLK VLOW=0V 0 µA
Low-levelinputcurrent:SEN VLOW=0V 10 µA
DIGITALOUTPUTS(CMOSINTERFACE:D0TOD13,OVR_SDOUT)
High-leveloutputvoltage DRVDD–0.1 DRVDD V
Low-leveloutputvoltage 0 0.1 V
DIGITALOUTPUTS(LVDSINTERFACE:DA0P/MTODA13P/M,DB0P/MTODB13P/M,CLKOUTP/M)
High-leveloutputvoltage(2) VODH StandardswingLVDS 270 +350 430 mV
Low-leveloutputvoltage(2) VODL StandardswingLVDS –430 –350 –270 mV
High-leveloutputvoltage(2) VODH LowswingLVDS +200 mV
Low-leveloutputvoltage(2) VODL LowswingLVDS –200 mV
Outputcommon-modevoltage VOCM 0.85 1.05 1.25 V
(1) SDATAandSCLKhaveaninternal180kΩpull-downresistor.
(2) Withanexternal100Ωtermination.
8 SubmitDocumentationFeedback Copyright©2009–2011,TexasInstrumentsIncorporated
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149
ADS4126, ADS4129
ADS4146, ADS4149
www.ti.com SBAS483G–NOVEMBER2009–REVISEDJANUARY2011
PIN CONFIGURATION (LVDS MODE)
RGZPACKAGE(1)
QFN-48
(TOPVIEW)
P M
1_ 1_ P M P M P M P M P M
1 1 _ _ _ _ _ _ _ _ _ _
D D 9 9 7 7 5 5 3 3 1 1
_ _ D D D D D D D D D D
0 0 _ _ _ _ _ _ _ _ _ _
1 1 8 8 6 6 4 4 2 2 0 0
D D D D D D D D D D D D
48 47 46 45 44 43 42 41 40 39 38 37
DRGND 1 36 DRGND
DRVDD 2 35 DRVDD
OVR_SDOUT 3 34 NC
CLKOUTM 4 33 NC
CLKOUTP 5 32 NC
DFS 6 31 NC
OE 7 30 RESET
AVDD 8 29 SCLK
AGND 9 28 SDATA
CLKP 10 27 SEN
CLKM 11 26 AVDD
AGND 12 25 AGND
13 14 15 16 17 18 19 20 21 22 23 24
M D P M D D D D C D D D
C N N N N D N D N D E D
V G I I G V G V V V V
A A A A A A R A
E
S
E
R
(1) ThePowerPADisconnectedtoDRGND.
Figure 1. ADS412xLVDSPinout
Copyright©2009–2011,TexasInstrumentsIncorporated SubmitDocumentationFeedback 9
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149
ADS4126, ADS4129
ADS4146, ADS4149
SBAS483G–NOVEMBER2009–REVISEDJANUARY2011 www.ti.com
RGZPACKAGE(2)
QFN-48
(TOPVIEW)
P M P M
3_ 3_ 1_ 1_ P M P M P M P M
1 1 1 1 _ _ _ _ _ _ _ _
D D D D 9 9 7 7 5 5 3 3
_ _ _ _ D D D D D D D D
2 2 0 0 _ _ _ _ _ _ _ _
1 1 1 1 8 8 6 6 4 4 2 2
D D D D D D D D D D D D
48 47 46 45 44 43 42 41 40 39 38 37
DRGND 1 36 DRGND
DRVDD 2 35 DRVDD
OVR_SDOUT 3 34 D0_D1_P
CLKOUTM 4 33 D0_D1_M
CLKOUTP 5 32 NC
DFS 6 31 NC
OE 7 30 RESET
AVDD 8 29 SCLK
AGND 9 28 SDATA
CLKP 10 27 SEN
CLKM 11 26 AVDD
AGND 12 25 AGND
13 14 15 16 17 18 19 20 21 22 23 24
M D P M D D D D C D D D
C N N N N D N D N D E D
V G I I G V G V V V V
A A A A A A R A
E
S
E
R
(2) ThePowerPAD™isconnectedtoDRGND.
Figure 2. ADS414xLVDSPinout
ADS412x,ADS414xPinAssignments(LVDSMode)
#OF
PINNAME PINNUMBER PINS FUNCTION DESCRIPTION
AVDD 8,18,20,22,24,26 6 I 1.8Vanalogpowersupply
AGND 9,12,14,17,19,25 6 I Analogground
CLKP 10 1 I Differentialclockinput,positive
CLKM 11 1 I Differentialclockinput,negative
INP 15 1 I Differentialanaloginput,positive
INM 16 1 I Differentialanaloginput,negative
Outputsthecommon-modevoltage(0.95V)thatcanbeusedexternallytobiasthe
VCM 13 1 O
analoginputpins.
SerialinterfaceRESETinput.
Whenusingtheserialinterfacemode,theinternalregistersmustinitializethrough
hardwareRESETbyapplyingahighpulseonthispinorbyusingthesoftwarereset
RESET 30 1 I option;refertotheSerialInterfacesection.
WhenRESETistiedhigh,theinternalregistersareresettothedefaultvalues.Inthis
condition,SENcanbeusedasananalogcontrolpin.
RESEThasaninternal180kΩpull-downresistor.
ThispinfunctionsasaserialinterfaceclockinputwhenRESETislow.WhenRESETis
SCLK 29 1 I high,SCLKhasnofunctionandshouldbetiedtoground.Thispinhasaninternal
180kΩpull-downresistor.
ThispinfunctionsasaserialinterfacedatainputwhenRESETislow.WhenRESETis
SDATA 28 1 I high,SDATAfunctionsasaSTANDBYcontrolpin(seeTable9).Thispinhasan
internal180kΩpull-downresistor.
ThispinfunctionsasaserialinterfaceenableinputwhenRESETislow.WhenRESET
SEN 27 1 I ishigh,SENhasnofunctionandshouldbetiedtoAVDD.Thispinhasaninternal
180kΩpull-upresistortoAVDD.
10 SubmitDocumentationFeedback Copyright©2009–2011,TexasInstrumentsIncorporated
ProductFolderLink(s):ADS4126ADS4129 ADS4146 ADS4149