16-Bit, High-Speed, 8-Channel, Simultaneous-Sampling ADC with Bipolar Inputs on

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ADS8588S
SBAS642A–DECEMBER2016–REVISEDAPRIL2017
ADS8588S 16-Bit, High-Speed, 8-Channel, Simultaneous-Sampling ADC with
Bipolar Inputs on a Single Supply
1 Features 3 Description
• 16-Bit ADCwithIntegratedAnalogFront-End The ADS8588S device is an 8-channel, integrated
1 data acquisition (DAQ) system based on a
• SimultaneousSampling:8-Channels
simultaneous-sampling, 16-bit successive
• Pin-ProgrammableBipolarInputs:±10Vand ±5V approximation (SAR) analog-to-digital converter
• HighInputImpedance:1MΩ (ADC) operating at a maximum of 200 kSPS per
channel. The device features a complete analog
• 5-VAnalogSupply:2.3-Vto5-V I/OSupply
front-end for each channel, including a programmable
• OvervoltageInputClampwith7-kVESD gain amplifier (PGA) with high input impedance of
• Low-Drift,On-ChipReference(2.5V)andBuffer 1 MΩ, input clamp, low-pass filter, and an ADC input
driver. The device also features a low-drift, precision
• ExcellentPerformance:
reference with a buffer to drive the ADC. A flexible
– 200-kSPSMaxThroughputonAllChannels
digitalinterfacesupportingserial, parallel,and parallel
– DNL: ±0.35LSB;INL: ±0.45LSB byte communication enables the device to be used
– SNR: 96.4dB;THD: −114dB withavarietyofhostcontrollers.
• OverTemperaturePerformance: The ADS8588S can be configured to accept ±10-V or
±5-V true bipolar inputs using a single 5-V supply.
– MaxOffsetDrift:3ppm/°C
The high input impedance allows direct connection
– GainDrift:6ppm/°C
with sensors and transformers, thus eliminating the
• On-ChipDigital FilterforOversampling need for external driver circuits. The high
• FlexibleParallel,Byte,andSerialInterface performance and accuracy, along with zero-latency
conversions offered by this device, also make the
• TemperatureRange:–40°Cto+125°C
ADS8588S a great choice for many industrial
• Package:64-PinLQFP automationandcontrolapplications.
2 Applications DeviceInformation(1)
• MonitoringandControlforPowerGrids PARTNUMBER PACKAGE BODYSIZE(NOM)
• ProtectionRelays ADS8588S LQFP(64) 10.00mm×10.00mm
• Multi-PhaseMotorControls (1) For all available packages, see the orderable addendum at
theendofthedatasheet.
• IndustrialAutomationandControls
• MultichannelDataAcquisitionSystems
SimplifiedBlockDiagram
AVDD DVDD
ADS8588S BUSY
FRSTDATA
STBY
AINA_I1NG_N1DP CCllaammpp 1 M: PGA 3rdL-OPFrder ADDrivCer 1AS6DA-BRCit RCEOSNEVTSTA, CONVSTB
1 M: RANGE
CS
1 M: RD/SCLK
AINA_I2NG_N2DP CCllaammpp 1 M: PGA 3rdL-OPFrder ADDrivCer 1AS6DA-BRCit DigitLaSaol AnCgdRioc n trol SInEtRer/fPaAceR PDABR[1/5S:E0R]
DOUTA
DOUTB
OS0
Digital Filter OS1
1 M: OS2
AINA_I7NG_N7DP CCllaammpp PGA 3rdL-OPFrder ADDrivCer 1AS6DA-BRCit REFCAPA
1 M:
REFCAPB
1 M:
AINA_I8NG_N8DP CCllaammpp 1 M: PGA 3rdL-OPFrder ADDrivCer 1AS6DA-BRCit 2.5 VREF REFIN/REFOUT
REFSEL
AGND REFGND DGND
NOTE: There are 8 channels for the ADS8588S. Copyright © 2017, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.
ADS8588S
SBAS642A–DECEMBER2016–REVISEDAPRIL2017 www.ti.com
Table of Contents
1 Features.................................................................. 1 7.17 SwitchingCharacteristics:ParallelDataRead
Operation,CSandRDSeparate.............................14
2 Applications........................................................... 1
7.18 SwitchingCharacteristics:SerialDataRead
3 Description............................................................. 1
Operation.................................................................14
4 RevisionHistory..................................................... 2
7.19 SwitchingCharacteristics:ByteModeDataRead
5 DeviceFamilyComparisonTable........................ 4 Operation.................................................................14
6 PinConfigurationandFunctions......................... 4 7.20 TypicalCharacteristics..........................................18
7 Specifications......................................................... 6 8 DetailedDescription............................................ 25
7.1 AbsoluteMaximumRatings......................................6 8.1 Overview.................................................................25
7.2 ESDRatings..............................................................7 8.2 FunctionalBlockDiagram.......................................25
7.3 RecommendedOperatingConditions.......................7 8.3 FeatureDescription.................................................26
7.4 ThermalInformation..................................................7 8.4 DeviceFunctionalModes........................................34
7.5 ElectricalCharacteristics...........................................8 9 ApplicationandImplementation........................ 47
7.6 TimingRequirements:CONVSTControl................11 9.1 ApplicationInformation............................................47
7.7 TimingRequirements:DataReadOperation..........11 9.2 TypicalApplication..................................................47
7.8 TimingRequirements:ParallelDataReadOperation, 10 PowerSupplyRecommendations..................... 51
CSandRDTiedTogether.......................................11
11 Layout................................................................... 52
7.9 TimingRequirements:ParallelDataReadOperation,
11.1 LayoutGuidelines.................................................52
CSandRDSeparate...............................................12
11.2 LayoutExample....................................................52
7.10 TimingRequirements:SerialDataRead
Operation.................................................................12 12 DeviceandDocumentationSupport................. 54
7.11 TimingRequirements:ByteModeDataRead 12.1 DocumentationSupport........................................54
Operation.................................................................12 12.2 ReceivingNotificationofDocumentationUpdates54
7.12 TimingRequirements:OversamplingMode..........12 12.3 CommunityResources..........................................54
7.13 TimingRequirements:ExitStandbyMode............12 12.4 Trademarks...........................................................54
7.14 TimingRequirements:ExitShutdownMode.........13 12.5 ElectrostaticDischargeCaution............................54
7.15 SwitchingCharacteristics:CONVSTControl........13 12.6 Glossary................................................................54
7.16 SwitchingCharacteristics:ParallelDataRead 13 Mechanical,Packaging,andOrderable
Operation,CSandRDTiedTogether.....................13 Information........................................................... 54
4 Revision History
NOTE:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion.
ChangesfromOriginal(December2016)toRevisionA Page
• DeletedADS8586SandADS8584Sfromdocument............................................................................................................. 1
• Changeddocumenttitle.......................................................................................................................................................... 1
• ChangedfirsttwosentencesofDescriptionsection.............................................................................................................. 1
• ChangedSimplifiedBlockDiagramfigure:changed2nd-orderto3rd-orderandRANGE/SDItoRANGEinfigure,
addedtitle............................................................................................................................................................................... 1
• ChangedDeviceFamilyComparisonTabletocomparedevicefamilymembers.................................................................. 4
• ChangedAGNDtoDGNDinDVDDtoDGNDrowofAbsoluteMaximumRatingstable...................................................... 6
• Changedminimumspecificationfrom–96to–64inlastrowofexternalreferenceforE parameter ................................. 8
G
• Changedx-axisofDCHistogramofCodes(±10V),DCHistogramofCodes(±5V),andDNLforAllCodescurves.......18
• Changedx-axisofINLvsAllCodes(±10V)andINLvsAllCodes(±5V)curves.............................................................. 19
• Changedsecond-ordertothird-orderinfirstparagraphofOverviewsection ..................................................................... 25
• Changed2nd-orderto3rd-orderandRANGE/SDItoRANGEinfunctionalblockdiagram................................................. 25
• Changed2nd-orderto3rd-orderinFront-EndCircuitSchematicforEachAnalogInputChannelfigure............................ 26
• ChangedmultipletotwoinfirstsentenceofsecondparagraphofAnalogInputssection.................................................. 26
• ChangedsecondtothirdintitleanddescriptionofThird-Order,Low-PassFilter(LPF)section......................................... 28
• AddedButterworthtoLPFdescriptioninThird-Order,Low-PassFilter(LPF)section......................................................... 28
• ChangedsecondtothirdintitlesofThird-OrderLPFMagnitudeResponseandThird-OrderLPFPhaseResponse
figures................................................................................................................................................................................... 28
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Revision History (continued)
• Changed16-BitADCTransferFunction(TwosComplementBinaryFormat)figureformoreaccuraterepresentation......33
• ChangedconversiontoconversionresultsinfirstsentenceofthirdparagraphinSerialDataReadsection.....................42
• Changedx-axisofcurvesDCHistogramforOSR2toDCHistogramforOSR64............................................................... 45
• Changed2nd-orderto3rd-orderin8-ChannelDAQforPowerAutomationUsingtheADS8588Sfigure........................... 47
• Changed2nd-orderto3rd-orderinInputRCLow-PassFilterfigure................................................................................... 48
• DeletedPSRRAcrossFrequency(WithoutDecapacitor)figurefromPowerSupplyRecommendationssection...............51
• ChangedPSRRAcrossFrequency(WithDecapacitor)figure ............................................................................................ 51
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5 Device Family Comparison Table
PRODUCT RESOLUTION(Bits) CHANNELS SAMPLERATE(kSPS)
ADS8588S 16 8,single-ended 200
ADS8586S 16 6,single-ended 250
ADS8584S 16 4,single-ended 330
ADS8578S 14 8,single-ended 200
6 Pin Configuration and Functions
PMPackage:ADS8588S
64-PinLQFP
TopView
D D D D D D D D
N N N N N N N N
G P G P G P G P G P G P G P G P
8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
N N N N N N N N N N N N N N N N
AI AI AI AI AI AI AI AI AI AI AI AI AI AI AI AI
4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9
6 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4
AVDD 1 48 AVDD
AGND 2 47 AGND
OS0 3 46 REFGND
OS1 4 45 REFCAPB
OS2 5 44 REFCAPA
PAR/SER/BYTE SEL 6 43 REFGND
STBY 7 42 REFIN/REFOUT
RANGE 8 41 AGND
CONVSTA 9 40 AGND
CONVSTB 10 39 REGCAP2
RESET 11 38 AVDD
RD/SCLK 12 37 AVDD
CS 13 36 REGCAP1
BUSY 14 35 AGND
FRSTDATA 15 34 REFSEL
DB0 16 33 DB15/BYTE SEL
7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2
1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 3
1 2 3 4 5 6 D A B D 9 0 1 2 3 N
DB DB DB DB DB DB DVD OUT OUT AGN DB DB1 DB1 DB1 DB1 HBE Not to scale
B7/D B8/D B14/
D D D
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PinFunctions
PIN
TYPE(1) DESCRIPTION
NAME NO.
AGND 2,26,35,40,41,47 P Analoggroundpins
AIN_1GND 50 AI Analoginputchannel1:negativeinput
AIN_1P 49 AI Analoginputchannel1:positiveinput
AIN_2GND 52 AI Analoginputchannel2:negativeinput
AIN_2P 51 AI Analoginputchannel2:positiveinput
AIN_3GND 54 AI Analoginputchannel3:negativeinput
AIN_3P 53 AI Analoginputchannel3:positiveinput
AIN_4GND 56 AI Analoginputchannel4:negativeinput
AIN_4P 55 AI Analoginputchannel4:positiveinput
AIN_5GND 58 AI Analoginputchannel5:negativeinput
AIN_5P 57 AI Analoginputchannel5:positiveinput
AIN_6GND 60 AI Analoginputchannel6:negativeinput
AIN_6P 59 AI Analoginputchannel6:positiveinput
AIN_7GND 62 AI Analoginputchannel7:negativeinput
AIN_7P 61 AI Analoginputchannel7:positiveinput
AIN_8GND 64 AI Analoginputchannel8:negativeinput
AIN_8P 63 AI Analoginputchannel8:positiveinput
Analogsupplypins.DecouplethesepinstotheclosestAGNDpins
AVDD 1,37,38,48 P
(seethePowerSupplyRecommendationssection)
Activehighdigitaloutputindicatingongoingconversion
BUSY 14 DO
(seetheBUSY(Output)section)
Activehighlogicinputtocontrolstartofconversionforfirsthalfcountofdeviceinput
CONVSTA 9 DI
channels(seetheCONVSTA,CONVSTB(Input)section)
Activehighlogicinputtocontrolstartofconversionforsecondhalfcountofdeviceinput
CONVSTB 10 DI
channels(seetheCONVSTA,CONVSTB(Input)section)
CS 13 DI Activelowlogicinputchip-selectsignal(seetheCS(Input)section)
DB0 16 DO DataoutputDB0(LSB)inparallelinterfacemode(seetheDB[6:0]section)
DB1 17 DO DataoutputDB1inparallelinterfacemode(seetheDB[6:0]section)
DB2 18 DO DataoutputDB2inparallelinterfacemode(seetheDB[6:0]section)
DB3 19 DO DataoutputDB3inparallelinterfacemode(seetheDB[6:0]section)
DB4 20 DO DataoutputDB4inparallelinterfacemode(seetheDB[6:0]section)
DB5 21 DO DataoutputDB5inparallelinterfacemode(seetheDB[6:0]section)
DB6 22 DO DataoutputDB6inparallelinterfacemode(seetheDB[6:0]section)
Multi-functionlogicoutputpin(seetheDB7/DOUTAsection):
DB7/DOUTA 24 DO thispinisdataoutputDB7inparallelandparallelbyteinterfacemode;
thispinisadataoutputpininserialinterfacemode.
Multi-functionlogicoutputpin(seetheDB8/DOUTBsection):
DB8/DOUTB 25 DO thispinisdataoutputDB8inparallelinterfacemode;
thispinisadataoutputpininserialinterfacemode.
DB9 27 DO DataoutputDB9inparallelinterfacemode(seetheDB[13:9]section)
DB10 28 DO DataoutputDB10inparallelinterfacemode(seetheDB[13:9]section)
DB11 29 DO DataoutputDB11inparallelinterfacemode(seetheDB[13:9]section)
DB12 30 DO DataoutputDB12inparallelinterfacemode(seetheDB[13:9]section)
DB13 31 DO DataoutputDB13inparallelinterfacemode(seetheDB[13:9]section)
Multi-functionlogicinputoroutputpin(seetheDB14/HBENsection):
DB14/HBEN 32 DIO thispinisdataoutputDB14inparallelinterfacemode;
thispinisacontrolinputpinforbyteselection(highorlow)inparallelbyteinterfacemode
Multi-functionlogicinputoroutputpin(seetheDB15/BYTESELsection):
DB15/BYTESEL 33 DIO thispinisdataoutputDB15(MSB)inparallelinterfacemode;
thispinisanactivehighcontrolinputpintoenableparallelbyteinterfacemode.
DVDD 23 P Digitalsupplypin;decouplewithAGNDonpin26.
Activehighdigitaloutputindicatingdatareadbackfromchannel1ofthedevice(seethe
FRSTDATA 15 DO
FRSTDATA(Output)section)
(1) AI=analoginput;AO=analogoutput;AIO=analoginput/output;DI=digitalinput;DO=digitaloutput;DIO=digitalinput/output;P=
powersupply;andNC=noconnect.
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PinFunctions (continued)
PIN
TYPE(1) DESCRIPTION
NAME NO.
Oversamplingmodecontrolpin
OS0 3 DI
(seetheOversamplingModeofOperationsection)
Oversamplingmodecontrolpin
OS1 4 DI
(seetheOversamplingModeofOperationsection)
Oversamplingmodecontrolpin
OS2 5 DI
(seetheOversamplingModeofOperationsection)
Logicinputpintoselectbetweenparallel,serial,orparallelbyteinterfacemode(seethe
PAR/SER/BYTESEL 6 DI
DataReadOperationsection)
Multi-functionlogicinputpin(seetheRANGE(Input)section):
RANGE 8 DI whenSTBYpinishigh,thispinselectstheinputrangeofthedevice(±10Vor±5V);when
STBYpinislow,thispinselectsbetweenthestandbyandshutdownmodes.
Multi-functionlogicinputpin(seetheRD/SCLK(Input)section):
RD/SCLK 12 DI thispinisanactive-lowreadyinputpininparallelandparallelbyteinterface;
thispinisaclockinputpininserialinterfacemode.
Referenceamplifieroutputpins.ThispinmustbeshortedtoREFCAPBanddecoupledto
REFCAPA 44 AO
AGNDusingalowESR,10-µFceramiccapacitor.
Referenceamplifieroutputpins.ThispinmustbeshortedtoREFCAPAanddecoupledto
REFCAPB 45 AO
AGNDusingalowESR,10-µFceramiccapacitor.
ReferenceGNDpin.ThispinmustbeshortedtotheanalogGNDplaneanddecoupledwith
REFGND 43,46 P
REFIN/REFOUTonpin42usinga10-µFcapacitor.
ThispinactsasaninternalreferenceoutputwhenREFSELishigh;
REFIN/REFOUT 42 AIO thispinfunctionsasinputpinfortheexternalreferencewhenREFSELislow;
decouplewithREFGNDonpin43usinga10-µFcapacitor.
Activehighlogicinputtoenabletheinternalreference
REFSEL 34 DI
(seetheREFSEL(Input)section)
Outputpin1fortheinternalvoltageregulator;decoupleseparatelytoAGNDusinga1-µF
REGCAP1 36 AO
capacitor.
Outputpin2fortheinternalvoltageregulator;decoupleseparatelytoAGNDusinga1-µF
REGCAP2 39 AO
capacitor.
Activehighlogicinputtoresetthedevicedigitallogic
RESET 11 DI
(seetheRESET(Input)section)
Activelowlogicinputtoenterthedeviceintooneofthetwopower-downmodes:standbyor
STBY 7 DI
shutdown(seethePower-DownModessection)
7 Specifications
7.1 Absolute Maximum Ratings
atT =25°C(unlessotherwisenoted)(1)
A
MIN MAX UNIT
AVDDtoAGND –0.3 7.0 V
DVDDtoDGND –0.3 7.0 V
AGNDtoDGND –0.3 0.3 V
AnaloginputvoltagetoAGND(2) –15 15 V
DigitalinputtoDGND –0.3 DVDD+0.3 V
REFINtoAGND –0.3 AVDD+0.3 V
Inputcurrenttoanypinexceptsupplies(2) –10 10 mA
Operating –40 125
Temperature Junction,T 150 °C
J
Storage,T –65 150
stg
(1) StressesbeyondthoselistedunderAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratings
only,whichdonotimplyfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderRecommended
OperatingConditions.Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2) Transientcurrentsofupto100mAdonotcauseSCRlatch-up.
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7.2 ESD Ratings
VALUE UNIT
Human-bodymodel(HBM),per Allpinsexceptanaloginputs ±2000
ANSI/ESDA/JEDECJS-001(1) Analoginputpinsonly ±7000
V Electrostaticdischarge V
(ESD)
Charged-devicemodel(CDM),perJEDEC
specificationJESD22-C101(2) Allpins ±500
(1) JEDECdocumentJEP155statesthat500-VHBMallowssafemanufacturingwithastandardESDcontrolprocess.
(2) JEDECdocumentJEP157statesthat250-VCDMallowssafemanufacturingwithastandardESDcontrolprocess.
7.3 Recommended Operating Conditions
overoperatingfree-airtemperaturerange(unlessotherwisenoted)
MIN NOM MAX UNIT
AVDD Analogsupplyvoltage 4.75 5 5.25 V
DVDD Digitalsupplyvoltage 2.3 3.3 AVDD V
7.4 Thermal Information
ADS8588S
THERMALMETRIC(1) PM(LQFP) UNIT
64PINS
R Junction-to-ambientthermalresistance 46.0 °C/W
θJA
R Junction-to-case(top)thermalresistance 7.8 °C/W
θJC(top)
R Junction-to-boardthermalresistance 20.1 °C/W
θJB
ψ Junction-to-topcharacterizationparameter 0.3 °C/W
JT
ψ Junction-to-boardcharacterizationparameter 19.6 °C/W
JB
R Junction-to-case(bottom)thermalresistance N/A °C/W
θJC(bot)
(1) Formoreinformationabouttraditionalandnewthermalmetrics,seetheSemiconductorandICPackageThermalMetricsapplication
report.
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7.5 Electrical Characteristics
minimumandmaximumspecificationsareatT =–40°Cto+125°C,AVDD=4.75Vto5.25V;typicalspecificationsareatT
A A
=25°C;AVDD=5V,DVDD=3V,V =2.5V(internal),andf =200kSPS(unlessotherwisenoted)
REF SAMPLE
TEST
PARAMETER TESTCONDITIONS MIN TYP MAX UNIT LEVEL(1)
ANALOGINPUTS
Full-scaleinputspan(2) RANGEpin=1 –10 10 A
V
(AIN_nPtoAIN_nGND) RANGEpin=0 –5 5 A
Operatinginputrange, RANGEpin=1 –10 10 A
AIN_nP V
positiveinput RANGEpin=0 –5 5 A
Operatinginputrange,
AIN_nGND Allinputranges –0.3 0 0.3 V B
negativeinput
RIN Inputimpedance AtTA=25°C 0.85 1 1.15 MΩ B
Inputimpedancedrift Allinputranges –25 ±7 25 ppm/°C B
IIkg(in) Inputleakagecurrent WallitihnpvuotltraagnegeastAIN_nP=VIN, (VIN–2)/RIN µA A
SYSTEMPERFORMANCE
Resolution 16 Bits A
NMC Nomissingcodes 16 Bits A
DNL Differentialnonlinearity Allinputranges –0.5 ±0.35 0.5 LSB(3) A
INL Integralnonlinearity(4) Allinputranges –1.5 ±0.45 1.5 LSB A
Allinput TA=–40°Cto –64 ±4 64 A
ranges, +85°C
EG Gainerror(5) erexfteerrennacle T+1A2=5–°C40°Cto –64 ±4 96 LSB A
Allinputranges,
±4 A
internalreference
Inputrange=±10V,
10 60 A
Gainerrormatching externalandinternalreference
LSB
(channel-to-channel) Inputrange=±5V,
12 60 A
externalandinternalreference
Allinputranges,
–14 ±6 14 B
externalreference
Gainerrortemperaturedrift ppm/°C
Allinputranges,
±10 B
internalreference
Inputrange=±10V –1.8 ±0.15 1.8 B
EO Offseterror mV
Inputrange=±5V –1.8 ±0.15 1.8 B
Offseterrormatching
Allinputranges 0.3 2.4 mV B
(channel-to-channel)
Offseterrortemperaturedrift Allinputranges –3 ±0.3 3 ppm/°C B
SAMPLINGDYNAMICS
tACQ Acquisitiontime 1 µs A
Maximumthroughputrateperchannel
fS withoutlatency Alleightchannelsincluded 200 kSPS A
(1) TestLevels:(A)Testedatfinaltest.Overtemperaturelimitsaresetbycharacterizationandsimulation.(B)Limitssetbycharacterization
andsimulation,acrosstemperaturerange.(C)Typicalvalueonlyforinformation,providedbydesignsimulation.
(2) Idealinputspan,doesnotincludegainoroffseterror.
(3) LSB=leastsignificantbit.
(4) ThisparameteristheendpointINL,notbest-fitINL.
(5) Gainerroriscalculatedafteradjustingforoffseterror,whichimpliesthatpositivefull-scaleerror=negativefull-scaleerror=gainerror÷
2.
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Electrical Characteristics (continued)
minimumandmaximumspecificationsareatT =–40°Cto+125°C,AVDD=4.75Vto5.25V;typicalspecificationsareatT
A A
=25°C;AVDD=5V,DVDD=3V,V =2.5V(internal),andf =200kSPS(unlessotherwisenoted)
REF SAMPLE
TEST
PARAMETER TESTCONDITIONS MIN TYP MAX UNIT LEVEL(1)
DYNAMICCHARACTERISTICS
Signal-to-noiseratio, Inputrange=±10V 91 92.7 A
SNR nooversampling dB
(VIN–0.5dBFSat1kHz) Inputrange=±5V 90.4 92.2 A
Signal-to-noiseratio, Inputrange=±10V 95.5 96.4 A
SNROSR oversampling=16x dB
(VIN–0.5dBFSat130Hz) Inputrange=±5V 94.4 95.5 A
Totalharmonicdistortion(6)
THD Allinputranges –114 –95 dB B
(VIN–0.5dBFSat1kHz)
Signal-to-noise+distortionratio, Inputrange=±10V 90.7 92.7 A
SINAD nooversampling dB
(VIN–0.5dBFSat1kHz) Inputrange=±5V 90.2 92.1 A
Signal-to-noise+distortionratio, Inputrange=±10V 95 96.4 A
SINADOSR oversampling=16x dB
(VIN–0.5dBFSat130Hz) Inputrange=±5V 94 95.4 A
Spurious-freedynamicrange
SFDR Allinputranges –118 dB B
(VIN–0.5dBFSat1kHz)
Crosstalkisolation(7) –95 dB A
AtTA=25°C, 24 B
inputrange=±10V
BW(–3dB) –3dB kHz
AtTA=25°C, 16 B
Small-signal inputrange=±5V
bandwidth AtTA=25°C, 14 B
inputrange=±10V
BW(–0.1dB) –0.1dB kHz
AtTA=25°C, 9.5 B
inputrange=±5V
Inputrange=±10V 13 C
tGROUP Groupdelay µs
Inputrange=±5V 19 C
INTERNALREFERENCEOUTPUT(REFSEL=1)
VREF(8) V(coolntafiggeuroendtahseoRuEtpFuINt)/REFOUTpin AtTA=25°C 2.4975 2.5 2.5025 V A
Internalreferencetemperaturedrift 7.5 ppm/°C B
Decouplingcapacitoron
C(REFIN_REFOUT) REFIN/REFOUT(9) 10 µF B
ReferencevoltagetotheADC
V(REFCAP) (ontheREFCAPA,REFCAPBpin) AtTA=25°C 3.996 4.0 4.004 V A
Referencebufferoutputimpedance 0.5 1 Ω C
Referencebufferoutputtemperature
5 ppm/°C B
drift
DecouplingcapacitoronREFCAPA,
C(REFCAP) REFCAPB 10 µF B
Turn-ontime C(REFCAP)=10µF, 25 ms B
C(REFIN_REFOUT)=10µF
EXTERNALREFERENCEINPUT(REFSEL=0)
ExternalreferencevoltageonREFIO
VREFIO_EXT (configuredasinput) 2.475 2.5 2.525 V B
Referenceinputimpedance 100 MΩ C
Referenceinputcapacitance 10 pF C
(6) Calculatedonthefirstnineharmonicsoftheinputfrequency.
(7) Isolationcrosstalkismeasuredbyapplyingafull-scalesinusoidalsignalupto160kHztoachannel,notselectedinthemultiplexing
sequence,andmeasuringtheeffectontheoutputofanyselectedchannel.
(8) Doesnotincludethevariationinvoltageresultingfromsoldershifteffects.
(9) RecommendedtouseanX7R-grade,0603-sizeceramiccapacitorforoptimumperformance(seetheLayoutGuidelinessection).
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ADS8588S
SBAS642A–DECEMBER2016–REVISEDAPRIL2017 www.ti.com
Electrical Characteristics (continued)
minimumandmaximumspecificationsareatT =–40°Cto+125°C,AVDD=4.75Vto5.25V;typicalspecificationsareatT
A A
=25°C;AVDD=5V,DVDD=3V,V =2.5V(internal),andf =200kSPS(unlessotherwisenoted)
REF SAMPLE
TEST
PARAMETER TESTCONDITIONS MIN TYP MAX UNIT LEVEL(1)
POWER-SUPPLYREQUIREMENTS
AVDD Analogpower-supplyvoltage Analogsupply 4.75 5 5.25 V A
DVDD Digitalpower-supplyvoltage Digitalsupplyrange 2.3 3.3 AVDD V A
ForADS8588S,AVDD=5V,
fS=200kSPS, 17.7 24.0 A
Analogsupplycurrent internalreference
IAVDD_DYN (operational) ForADS8588S,AVDD=5V, mA
fS=200kSPS, 17.1 24.0 A
externalreference
ForADS8588S,AVDD=5V,
internalreference, 12.4 17.0 A
Analogsupplycurrent devicenotconverting
IAVDD_STC (static) ForADS8588S,AVDD=5V, mA
externalreference, 12.0 17.0 A
devicenotconverting
AtAVDD=5V,deviceinSTDBY
mode, 4.2 5.5 A
AVDDsupply internalreference
IAVDD_STDBY STANDBYcurrent AtAVDD=5V,deviceinSTDBY mA
mode, 3.8 5.5 A
externalreference
AtAVDD=5V,devicein
AVDDsupply PWR_DN,internalor
IAVDD_PWR_DN power-downcurrent externalreference, 0.2 6 µA A
TA=–40°Cto+85°C
ForADS8588S,
IDVDD_DYN Digitalsupplycurrent DVDD=3.3V, 0.15 0.3 mA A
fS=200kSPS
AtAVDD=5V,deviceinSTDBY
IDVDD_STDBY DVDDsupplySTANDBYcurrent mode 0.05 1.5 µA A
AtAVDD=5V,devicein
IDVDD_PWR-DN DVDDsupplypower-downcurrent PWR_DNmode 0.05 1.5 µA A
DIGITALINPUTS(CMOS)
VIH Digitalhighinputvoltagelogiclevel DVDD>2.3V 0.7×DVDD DVDD+0.3 V A
VIL Digitallowinputvoltagelogiclevel DVDD>2.3V –0.3 0.3×DVDD V A
Inputleakagecurrent 100 nA A
Inputpincapacitance 5 pF A
DIGITALOUTPUTS(CMOS)
VOH Digitalhighoutputvoltagelogiclevel IO=100-µAsource 0.8×DVDD DVDD V A
VOL Digitallowoutputvoltagelogiclevel IO=100-µAsink 0 0.2×DVDD V A
Floatingstateleakagecurrent OnlyforSDO 1 µA A
Internalpincapacitance 5 pF A
TEMPERATURERANGE
TA Operatingfree-airtemperature –40 125 °C A
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