QUAD CHANNEL, 14 BIT, 125/105 MSPS ADC WITH SERIAL LVDS OUTPUTS (Rev. C)

66 Pages·2014·2.23 MB·English

ADS6445-EP
ADS6444-EP
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QUAD CHANNEL, 14 BIT, 125/105 MSPS ADC WITH SERIAL LVDS OUTPUTS
CheckforSamples:ADS6445-EP,ADS6444-EP
FEATURES APPLICATIONS
1
• MaximumSampleRate:125MSPS • Base-StationIFReceivers
• 14-BitResolutionwithNoMissingCodes • DiversityReceivers
• SimultaneousSampleand Hold • Medical Imaging
• 3.5-dBCoarseGainand upto6-dB • TestEquipment
ProgrammableFineGainfor SFDR/SNRTrade-
Off SUPPORTS DEFENSE, AEROSPACE,
AND MEDICAL APPLICATIONS
• SerializedLVDS OutputswithProgrammable
InternalTerminationOption • ControlledBaseline
• SupportsSine,LVCMOS,LVPECL,LVDSClock • OneAssemblyandTestSite
InputsandAmplitudeDownto400mV
PP • OneFabricationSite
• InternalReferencewithExternalReference
• AvailableinMilitary(–55°Cto125°C)
Support
TemperatureRange
• NoExternalDecouplingRequiredfor
• ExtendedProductLifeCycle
References
• ExtendedProduct-ChangeNotification
• 3.3-VAnalogand DigitalSupply
• ProductTraceability
• 64-pinQFNPackage(9mm×9mm)
• FeatureCompatibleDual ChannelFamily Table1.ADS644XQuadChannelFamily(1)
125MSPS 105MSPS
ADS644X
ADS6445 ADS6444
14Bit
(1) ProductPreviewforADS6444
Table2.PerformanceSummary
ADS6445 ADS6444
Fin=10MHz(0dBgain) 87 91
SFDR,dBc
Fin=170MHz(3.5dBgain) 79 83
Fin=10MHz(0dBgain) 73.4 73.4
SINAD,dBFS
Fin=170MHz(3.5dBgain) 68.3 69.3
Power,perchannel,mW 420 340
DESCRIPTION
The ADS6445/ADS6444 is a high performance 14 bit 125/105 MSPS quad channel A-D converter. Serial LVDS
data outputs reduce the number of interface lines, resulting in a compact 64-pin QFN package (9 mm × 9 mm)
thatallowsforhighsystemintegrationdensity.Thedeviceincludes3.5dBcoarsegainoptionthat canbeusedto
improve SFDR performance with little degradation in SNR. In addition to the coarse gain, fine gain options also
exist,programmablein1dBstepsupto6dB.
The output interface is 2-wire, where each ADC data is serialized and output over two LVDS pairs. This makes it
possible to halve the serial data rate (compared to a 1-wire interface) and restrict it to less than 1 Gbps easing
receiver design. The ADS644X also includes the traditional 1-wire interface that can be used at lower sampling
frequencies.
An internal phase lock loop (PLL) multiplies the incoming ADC sampling clock to derive the bit clock. The bit
clock is used to serialize the 14 bit data from each channel. In addition to the serial data streams, the frame and
bitclocksalsoaretransmittedasLVDS outputs.
1
Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof
TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
PRODUCTIONDATAinformationiscurrentasofpublicationdate. Copyright©2008–2013,TexasInstrumentsIncorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarilyincludetestingofallparameters.
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The LVDS output buffers have features such as programmable LVDS currents, current doubling modes and
internal termination options. These can be used to widen eye openings and improve signal integrity, easing
capturebythereceiver.
TheADCchanneloutputscanbetransmittedeitherasMSBorLSBfirst and2scomplementorstraightbinary.
The ADS644X has internal references, but also can support an external reference mode. The device is specified
over–55°Cto125°Coperatingjunctiontemperaturerange.
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This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.
ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemore
susceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.
DD DD
AVDAGN CAP LVDLGN
BITClock DCLKP
DCLKM
CLKP PLL
CLKM
FRAMEClock FCLKP
FCLKM
DA0_P
INA_P Digital DA0_M
14 Bit Encoder
SHA ADC and DA1_P
INA_M Serializer
DA1_M
DB0_P
INB_P Digital DB0_M
14 Bit Encoder
SHA ADC and
DB1_P
INB_M Serializer
DB1_M
DC0_P
INC_P Digital DC0_M
14 Bit Encoder
SHA ADC and DC1_P
INC_M Serializer
DC1_M
DD0_P
IND_P Digital DD0_M
14 Bit Encoder
SHA ADC and DD1_P
IND_M Serializer
DD1_M
P M
F F
E E
R R
VCM Reference Parallel Serial
Interface Interface
ADS644x
DN G1 G2 G3 G4 EN TA LK ET
P CF CF CF CF S DA SC ES
S R
B0199-03
ORDERINGINFORMATION(1)
SPECIFIED
TRANSPORT
PACKAGE JUNCTION PACKAGE
PRODUCT PACKAGE-LEAD DESIGNATOR(2) TEMPERATURE MARKING ORDERINGNUMBER MEDIA, VIDNUMBER
QUANTITY
RANGE
ADS6445 6445EP ADS6445MRGCTEP V62/08628-01XE
QFN-64(3) RGC –55°Cto125°C 250,Tape/reel
ADS6444 6444EP ADS6444MRGCTEP V62/08628-02XE
(1) Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orseetheTI
websiteatwww.ti.com.
(2) Packagedrawings,thermaldata,andsymbolizationareavailableatwww.ti.com/packaging.
(3) Forthermalpadsizeonthepackage,seethemechanicaldrawingsattheendofthisdatasheet.θ =23.17°C/W(0LFMairflow),θ
JA JC
=22.1°C/Wwhenusedwith2oz.coppertraceandpadsoldereddirectlytoaJEDECstandardfourlayer3in.x3in.PCB.
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ABSOLUTE MAXIMUM RATINGS(1)
VALUE UNIT
AVDD Supplyvoltagerange –0.3to3.9 V
LVDD Supplyvoltagerange –0.3to3.9 V
VoltagebetweenAGNDandDGND –0.3to0.3 V
VoltagebetweenAVDDtoLVDD –0.3to3.3 V
Voltageappliedtoexternalpin,VCM –0.3to2.0 V
Voltageappliedtoanaloginputpins –0.3Vtominimum(3.6,AVDD+0.3V) V
T Operatingjunctiontemperature 150 °C
J
T Storagetemperaturerange –65to150 °C
stg
Leadtemperature1,6mm(1/16")fromthecasefor10seconds 220 °C
(1) Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.Thesearestressratings
only,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperating
conditionsisnotimplied.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
xxx
100.00
s)
ar
Ye
y ( 10.00
c
n
a
ct
e
p
x
E
e
m
eti
Lif
1.00
85 95 105 115 125 135 145
Junction Temperature, TJ(°C)
(1) Seedatasheetforabsolutemaximumandminimumrecommendedoperatingconditions.
(2) Silicon operating life design goal is 10 years at 105°C junction temperature (does not include package interconnect
life).
(3) Enhancedplasticproductdisclaimerapplies.
Figure1. LifetimeExpectancyGraphatElevatedTemperature
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THERMAL INFORMATION
ADS644x-EP
THERMALMETRIC(1) RGC UNITS
64PINS
θ Junction-to-ambientthermalresistance(2) 23.6
JA
θ Junction-to-case(top)thermalresistance(3) 7.7
JCtop
θ Junction-to-boardthermalresistance(4) 3
JB
°C/W
ψ Junction-to-topcharacterizationparameter(5) 0.1
JT
ψ Junction-to-boardcharacterizationparameter(6) 3
JB
θ Junction-to-case(bottom)thermalresistance(7) 0.3
JCbot
(1) Formoreinformationabouttraditionalandnewthermalmetrics,seetheICPackageThermalMetricsapplicationreport,SPRA953.
(2) Thejunction-to-ambientthermalresistanceundernaturalconvectionisobtainedinasimulationonaJEDEC-standard,high-Kboard,as
specifiedinJESD51-7,inanenvironmentdescribedinJESD51-2a.
(3) Thejunction-to-case(top)thermalresistanceisobtainedbysimulatingacoldplatetestonthepackagetop.NospecificJEDEC-
standardtestexists,butaclosedescriptioncanbefoundintheANSISEMIstandardG30-88.
(4) Thejunction-to-boardthermalresistanceisobtainedbysimulatinginanenvironmentwitharingcoldplatefixturetocontrolthePCB
temperature,asdescribedinJESD51-8.
(5) Thejunction-to-topcharacterizationparameter,ψ ,estimatesthejunctiontemperatureofadeviceinarealsystemandisextracted
JT
fromthesimulationdataforobtainingθ ,usingaproceduredescribedinJESD51-2a(sections6and7).
JA
(6) Thejunction-to-boardcharacterizationparameter,ψ ,estimatesthejunctiontemperatureofadeviceinarealsystemandisextracted
JB
fromthesimulationdataforobtainingθ ,usingaproceduredescribedinJESD51-2a(sections6and7).
JA
(7) Thejunction-to-case(bottom)thermalresistanceisobtainedbysimulatingacoldplatetestontheexposed(power)pad.Nospecific
JEDECstandardtestexists,butaclosedescriptioncanbefoundintheANSISEMIstandardG30-88.
Spacer
RECOMMENDED OPERATING CONDITIONS
overoperatingfree-airtemperaturerange(unlessotherwisenoted)
MIN NOM MAX UNIT
SUPPLIES
AVDD Analogsupplyvoltage 3.0 3.3 3.6 V
LVDD LVDSBuffersupplyvoltage 3.0 3.3 3.6 V
ANALOGINPUTS
Differentialinputvoltagerange 2 V
pp
Inputcommon-modevoltage 1.5±0.1 V
VoltageappliedonVCMinexternalreferencemode 1.45 1.50 1.55 V
CLOCKINPUT
ADS6445 5 125
Inputclocksamplerate,F MSPS
srated
ADS6444 5 105
Sinewave,accoupled 0.4 1.5
LVPECL,accoupled ±0.8
Inputclockamplitudedifferential(V –V ) V
CLKP CLKM pp
LVDS,accoupled ±0.35
LVCMOS,accoupled 3.3
InputClockdutycycle 35 50 65 %
DIGITALOUTPUTS
Maximumexternalloadcapacitancefromeachoutputpin Withoutinternaltermination 5
C pF
LOAD toDGND Withinternaltermination 10
R Differentialloadresistance(external)betweentheLVDSoutputpairs 100 Ω
LOAD
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ELECTRICAL CHARACTERISTICS
Typicalvaluesareat25°C,minandmaxvaluesareacrossthefulljunctiontemperaturerangeT =–55°CtoT =
J,MIN J,MAX
125°C,AVDD=LVDD=3.3V,maximumratedsamplingfrequency,50%clockdutycycle,–1dBFSdifferentialanaloginput,
internalreferencemode(unlessotherwisenoted).
ADS6445 ADS6444
UNIT
PARAMETER Fs=125MSPS Fs=105MSPS
MIN TYP MAX MIN TYP MAX
RESOLUTION 14 14 Bits
ANALOGINPUT
Differentialinputvoltagerange 2.0 2.0 VPP
Differentialinputcapacitance 7 7 pF
Analoginputbandwidth 500 500 MHz
Analoginputcommonmodecurrent(perinputpin 155 130 μA
ofeachADC)
REFERENCEVOLTAGES
VREFB Internalreferencebottomvoltage 1.0 1.0 V
VREFT Internalreferencetopvoltage 2.0 2.0 V
ΔVREF Internalreferenceerror(VREFT–VREFB) 0.985 1 1.015 0.985 1 1.015 V
VCM Commonmodeoutputvoltage 1.5 1.5 V
VCMoutputcurrentcapability ±4 ±4 mA
DCACCURACY
Nomissingcodes Assured Assured
EO Offseterror,acrossdevicesandacrosschannels –15 ±2 15 –15 ±2 15 mV
withinadevice
Offseterrortemperaturecoefficient,across 0.05 0.05 mV/°C
devicesandacrosschannelswithinadevice
Therearetwosourcesofgainerror-internalreferenceinaccuracyandchannelgainerror
EGREF Gainerrorduetointernalreferenceinaccuracy -0.75 0.1 0.75 -0.75 0.1 0.75 %FS
alone,(ΔVREF/2.0)%
Referencegainerrortemperaturecoefficient 0.0125 0.0125 Δ%/°C
EGCHAN Gainerrorofchannelalone,acrossdevicesand ±0.3 ±0.3 %FS
acrosschannelswithinadevice
Channelgainerrortemperaturecoefficient,across 0.005 0.005 Δ%/°C
devicesandacrosschannelswithinadevice
DNL Differentialnonlinearity,Fin=50MHz –0.99 ±0.6 2.0 –0.99 ±0.6 2.0 LSB
INL Integralnonlinearity,Fin=50MHz -5 ±3 5 -5 ±3 5 LSB
PSRR DCpowersupplyrejectionratio 0.5 0.5 mV/V
POWERSUPPLY
ICC Totalsupplycurrent 502 410 mA
IAVDD Analogsupplycurrent 410 322 mA
ILVDD LVDSsupplycurrent 92 88 mA
Totalpower 1.65 1.8 1.35 1.5 W
Powerdown(withinputclockstopped) 77 150 77 150 mW
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ELECTRICAL CHARACTERISTICS
Typicalvaluesareat25°C,minandmaxvaluesareacrossthefulljunctiontemperaturerangeT =–55°CtoT =
J,MIN J,MAX
125°C,AVDD=LVDD=3.3V,maximumratedsamplingfrequency,50%clockdutycycle,–1dBFSdifferentialanaloginput,
internalreferencemode(unlessotherwisenoted).
ADS6445 ADS6444
PARAMETER TESTCONDITIONS Fs=125MSPS Fs=105MSPS UNIT
MIN TYP MAX MIN TYP MAX
DYNAMICACCHARACTERISTICS
Fin=10MHz 73.7 73.8
Fin=50MHz 68.5 73.1 73.2
Fin=70MHz 72.7 69 73
SNR Fin=100MHz 72.1 72.2
Signaltonoise dBFS
ratio 0dBgain 69.9 70.2
Fin=170MHz
3.5dBCoarsegain 69.4 69.7
0dBgain 68.7 68.8
Fin=230MHz
3.5dBCoarsegain 68.1 68.2
Fin=10MHz 73.4 73.4
Fin=50MHz 67.75 72.3 71.7
Fin=70MHz 71.2 68.5 72
SINAD
Signaltonoise Fin=100MHz 71.8 72
dBFS
anddistortion 0dBgain 67.9 69.8
ratio Fin=170MHz
3.5dBCoarsegain 68.3 69.3
0dBgain 67.8 67.7
Fin=230MHz
3.5dBCoarsegain 67.9 67.6
RMS Inputstiedtocommon-mode 1.05 1.05 LSB
Outputnoise
Fin=10MHz 87 91
Fin=50MHz 69 81 80
Fin=70MHz 78 74 81
SFDR Fin=100MHz 86 88
Spuriousfree dBc
dynamicrange 0dBgain 76 79
Fin=170MHz
3.5dBCoarsegain 79 83
0dBgain 77 77
Fin=230MHz
3.5dBCoarsegain 80 80
Fin=10MHz 93 94
Fin=50MHz 69 87 88
Fin=70MHz 87 74 88
HD2 Fin=100MHz 89 90
dBc
Secondharmonic 0dBgain 83 84
Fin=170MHz
3.5dBCoarsegain 85 86
0dBgain 80 81
Fin=230MHz
3.5dBCoarsegain 82 83
Fin=10MHz 87 91
Fin=50MHz 69 81 80
Fin=70MHz 78 74 81
HD3 Fin=100MHz 86 88
dBc
Thirdharmonic 0dBgain 76 79
Fin=170MHz
3.5dBCoarsegain 79 83
0dBgain 77 77
Fin=230MHz
3.5dBCoarsegain 80 80
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ELECTRICAL CHARACTERISTICS (continued)
Typicalvaluesareat25°C,minandmaxvaluesareacrossthefulljunctiontemperaturerangeT =–55°CtoT =
J,MIN J,MAX
125°C,AVDD=LVDD=3.3V,maximumratedsamplingfrequency,50%clockdutycycle,–1dBFSdifferentialanaloginput,
internalreferencemode(unlessotherwisenoted).
ADS6445 ADS6444
PARAMETER TESTCONDITIONS Fs=125MSPS Fs=105MSPS UNIT
MIN TYP MAX MIN TYP MAX
Fin=10MHz 91 91
Fin=50MHz 87 87
Worstharmonic
(otherthanHD2, Fin=100MHz 90 91 dBc
HD3)
Fin=170MHz 88 88
Fin=230MHz 87 87
Fin=10MHz 86 89.5
Fin=50MHz 69 80 80
THD
Totalharmonic Fin=100MHz 84.5 72 79 dBc
distortion
Fin=170MHz 73.5 86
Fin=230MHz 74 77
ENOB Fin=50MHz 10.95 11.7
Effectivenumber Bits
ofbits Fin=70MHz 11.3 11.7
IMD F1=46.09MHz, 88 90
2-Toneinter- F2=50.09MHz
dBFS
modulation F1=185.09MHz, 86 88
distortion F2=190.09MHz
Nearchannel 90 92
Cross-talksignal
frequency=10MHz
Cross-talk dBc
Farchannel 103 105
Cross-talksignal
frequency=10MHz
Inputoverload Recoverytowithin1%(offinalvalue)for6- 1 1 Clockcycles
recovery dBoverloadwithsinewaveinput
ACPSRR 35 35 dBc
Powersupply <100MHzsignal,100mVPPonAVDD
supply
rejectionratio
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DIGITAL CHARACTERISTICS
TheDCspecificationsrefertotheconditionwherethedigitaloutputsarenotswitching,butarepermanentlyatavalidlogic
level0or1AVDD=LVDD=3.3V,I =3.5mA,R =100Ω(1).
O LOAD
AllLVDSspecificationsarecharacterized,butnottestedatproduction.
ASD6445/ADS6444
PARAMETER TESTCONDITIONS UNIT
MIN TYP MAX
DIGITALINPUTS
High-levelinputvoltage 2.4 V
Low-levelinputvoltage 0.8 V
High-levelinputcurrent 10 μA
Low-levelinputcurrent 10 μA
Inputcapacitance 4 pF
DIGITALOUTPUTS
High-leveloutputvoltage 1375 mV
Low-leveloutputvoltage 1025 mV
Outputdifferentialvoltage|V | 250 350 450 mV
OD
OutputoffsetvoltageV Common-modevoltageofOUTPandOUTM 1200 mV
OS
Outputcapacitanceinsidethedevice,fromeitheroutputto 2 pF
Outputcapacitance
ground
(1) I referstotheLVDSbuffercurrentsetting,R istheexternaldifferentialloadresistancebetweentheLVDSoutputpair.
O LOAD
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TIMING SPECIFICATIONS(1)
Typicalvaluesareat25°C,minandmaxvaluesareacrossthefulljunctiontemperaturerangeT =–55°CtoT =
J,MIN J,MAX
125°C,AVDD=LVDD=3.3V,maximumratedsamplingfrequency,sinewaveinputclock,1.5V clockamplitude,C =5
PP L
pF (2),I =3.5mA,R =100Ω (3),nointernaltermination,unlessotherwisenoted.
O L
ADS6445 ADS6444
PARAMETER TESTCONDITIONS Fs=125MSPS Fs=105MSPS UNIT
MIN TYP MAX MIN TYP MAX
tJ Aperturejitter Uncertaintyinthe 250 250 fsrms
samplinginstant
INTERFACE:2-wire,DDRbitclock,14xserialization
tsu Datasetuptime(4)(5)(6) Fbirtocmlodckatcarocsross-osv-oevrerto 0.55 0.65 ns
th Dataholdtime(4)(5)(6) Ftorodmatabictrcoloscsk-ocvreorss-over 0.58 0.7 ns
Inputclockrisingedge
Clockpropagationdelay
tpd_clk (6) cross-overtoframeclock 4.4 4.4 ns
risingedgecross-over
Bitclockcycle-cyclejitter
(5) 350 350 pspp
Frameclockcycle-cycle
jitter(5) 75 75 pspp
Thefollowingspecificationsapplyfor5MSPS≤Fs≤125MSPSandallinterfaceoptions.
Delayfrominputclock
tA Aperturedelay risingedgetotheactual 2 2 ns
samplinginstant
Channel-channelwithin
Aperturedelayvariation ±80 ±80 ps
samedevice
Timeforasampleto
ADCLatency(7) propagatetoADC 12 12 Clockcycles
outputs,seeFigure2
Timetovaliddataafter
comingoutofglobal 100 100 μs
powerdown
Timetovaliddataafter
Wakeuptime 100 100 μs
inputclockisre-started
Timetovaliddataafter
comingoutofchannel 200 200 Clockcycles
standby
tRISE Datarisetime From–100mVto+100 100 100 ps
mV
tFALL Datafalltime From+100mVto–100 100 100 ps
mV
Bitclockandframe From–100mVto+100
tRISE clockrisetime mV 100 100 ps
Bitclockandframe From+100mVto–100
tFALL clockfalltime mV 100 100 ps
LVDSBitclockduty
50% 50%
cycle
LVDSFrameclockduty
50% 50%
cycle
(1) Timingparametersareensuredbydesignandcharacterizationandnottestedinproduction.
(2) C istheexternalsingle-endedloadcapacitancebetweeneachoutputpinandground.
L
(3) I referstotheLVDSbuffercurrentsetting;R istheexternaldifferentialloadresistancebetweentheLVDSoutputpair.
o L
(4) Timingparametersaremeasuredattheendofa2inchPCBtrace(100Ωcharacteristicimpedance)terminatedbyR andC .
L L
(5) Setupandholdtimespecificationstakeintoaccounttheeffectofjitterontheoutputdataandclock.
(6) RefertoOutputTimingsinapplicationsectionfortimingsatlowersamplingfrequenciesandotherinterfaceoptions.
(7) Notethatthetotallatency=ADClatency+internalserializerlatency.Theserializerlatencydependsontheinterfaceoptionselectedas
showninTable27.
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