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High-ResolutionAnalog-to-DigitalConverter

CheckforSamples:ADS1282

FEATURES

•

HighResolution:

130dBSNR(250SPS,High-ResolutionMode)127dBSNR(250SPS,Low-PowerMode)HighAccuracy:THD:–122dBINL:0.5ppmLow-NoisePGA

Two-ChannelInputMUX

Inherently-StableModulatorwithFastRespondingOver-RangeDetectionFlexibleDigitalFilter:

Sinc+FIR+IIR(Selectable)

LinearorMinimumPhaseResponseProgrammableHigh-PassFilter

SelectableFIRDataRates:250SPSto4kSPSFilterBypassOption

LowPowerConsumption:High-ResolutionMode:25mWLow-PowerMode:17mWShutdown:10mW

OffsetandGainCalibrationEngineSYNCInputAnalogSupply:

Unipolar(+5V)orBipolar(±2.5V)DigitalSupply:1.8Vto3.3V

DESCRIPTION

TheADS1282isanextremelyhigh-performance,single-chipanalog-to-digitalconverter(ADC)withanintegrated,low-noiseprogrammablegainamplifier(PGA)andtwo-channelinputmultiplexer(MUX).TheADS1282issuitableforthedemandingneedsofenergyexplorationandseismicmonitoringenvironments.

Theconverterusesafourth-order,inherentlystable,delta-sigma(ΔΣ)modulatorthatprovidesoutstandingnoiseandlinearityperformance.Themodulatorisusedeitherinconjunctionwiththeon-chipdigitalfilter,orcanbebypassedforusewithpostprocessingfilters.

TheflexibleinputMUXprovidesanadditionalexternalinputformeasurement,aswellasinternalself-testconnections.ThePGAfeaturesoutstandinglownoise(5nV/√Hz)andhighinputimpedance,allowingeasyinterfacingtogeophonesandhydrophonesoverawiderangeofgains.

Thedigitalfilterprovidesselectabledataratesfrom250to4000samplespersecond(SPS).Thehigh-passfilter(HPF)featuresanadjustablecornerfrequency.On-chipgainandoffsetscalingregisterssupportsystemcalibration.

Thesynchronizationinput(SYNC)canbeusedtosynchronizetheconversionsofmultipleADS1282s.TheSYNCinputalsoacceptsaclockinputforcontinuousalignmentofconversionsfromanexternalsource.

Twooperatingmodesallowoptimizationofnoiseandpower.Together,theamplifier,modulator,andfilterdissipate25mWandonly17mWinlow-powermode.TheADS1282isavailableinacompactTSSOP-28packageandisfullyspecifiedfrom–40°Cto+85°C,withamaximumoperatingrangeto+125°C.

AVDDVREFNVREFPDVDDADS1282Input󰀀1

4th-OrderDSModulatorProgrammableDigital󰀀FilterCLKSCLKDOUTDINDRDY•

••••

••

••••

APPLICATIONS

•••

EnergyExplorationSeismicMonitoring

High-AccuracyInstrumentation

MUXInput󰀀2

VCOMOver-RangeModulator󰀀Output

PGACalibrationSPIInterface3ControlSYNCRESETPWDNAVSSDGNDPleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

Alltrademarksarethepropertyoftheirrespectiveowners.

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PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.

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ThisintegratedcircuitcanbedamagedbyESD.TexasInstrumentsrecommendsthatallintegratedcircuitsbehandledwithappropriateprecautions.Failuretoobserveproperhandlingandinstallationprocedurescancausedamage.

ESDdamagecanrangefromsubtleperformancedegradationtocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetitspublishedspecifications.

ORDERINGINFORMATION

Forthemostcurrentpackageandorderinginformation,seethePackageOptionAddendumattheendofthisdocument,orvisitthedeviceproductfolderatti.com.

ABSOLUTEMAXIMUMRATINGS(1)

Overoperatingfree-airtemperaturerange(unlessotherwisenoted).

ADS1282

AVDDtoAVSSAVSStoDGNDDVDDtoDGNDInputcurrentInputcurrentAnaloginputvoltage

DigitalinputvoltagetoDGNDMaximumjunctiontemperatureOperatingtemperaturerangeStoragetemperaturerange(1)

–0.3to+5.5–2.8to+0.3–0.3to+3.9100,momentary10,continuousAVSS–0.3toAVDD+0.3

–0.3toDVDD+0.3

+150–40to+125–60to+150

UNITVVVmAmAVV°C°C°C

Stressesabovetheseratingsmaycausepermanentdamage.Exposuretoabsolutemaximumconditionsforextendedperiodsmaydegradedevicereliability.Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthosespecifiedisnotimplied.

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ELECTRICALCHARACTERISTICS

Limitspecificationsat–40°Cto+85°C.Typicalspecificationsat+25°C,AVDD=+2.5V,AVSS=–2.5V,fCLK(1)=4.096MHz,VREFP=+2.5V,VREFN=–2.5V,DVDD=+3.3V,CAPN–CAPP=10nF,PGA=1,High-ResolutionMode,andfDATA=1000SPS,unlessotherwisenoted.

ADS1282

PARAMETERANALOGINPUTSFull-scaleinputvoltageAbsoluteinputrange

PGAinputvoltagenoisedensityDifferentialinputimpedance(2)Common-modeinputimpedanceInputbiascurrentCrosstalk

MUXon-resistance

PGAOUTPUT(CAPP,CAPN)Absoluteoutputrange

PGAdifferentialoutputimpedanceOutputimpedancetoleranceExternalbypasscapacitance

ModulatordifferentialinputimpedanceACPERFORMANCESignal-to-noiseratio(3)

SNR

High-resolutionmodeLow-powermodeHigh-resolutionmodePGA=1...16PGA=32

Totalharmonicdistortion(4)

THD

PGA=64Low-powermodePGA=1...16PGA=32PGA=64

Spurious-freedynamicrange

DCPERFORMANCEResolutionDatarate

Integralnonlinearity(INL)(5)Offseterror

OffseterroraftercalibrationOffsetdriftGainerror(8)

Gainerroraftercalibration

(7)(7)

CONDITIONSVIN=(AINP–AINN)

AINPorAINN

MINTYP±VREF/(2×PGA)

MAXUNITV

AVSS+0.7

511001

f=31.25Hz

–13530

AVSS+0.4

600±1010

High-resolutionmodeLow-powermode

120117

55110124121–122–117–115–122–113–109123

AVDD–1.25VnV/√HzGΩMΩnAdBΩ

AVDD–0.4VΩ%

100nFkΩkΩ

dB

–114–110

dB

–114–108

dBdB

SFDR

Nomissingcodes

fDATA

FIRfiltermodeSincfiltermodeDifferentialinputShortedinputHigh-resolutionmodeLow-powermode

312508000

0.000055010.02

–1.5–1

–1.0–0.50.0002

–0.504000128,0000.0004200

BitsSPSSPS%FSR(6)

mVmVmV/°C%%%

(1)(2)(3)(4)(5)(6)(7)(8)

fCLK=systemclock.

Inputimpedanceisimprovedbydisablinginputchopping(CHOPbit=0).VIN=20mVDC/PGA;seeTable1.VIN=31.25Hz,–0.5dBFS.Best-fitmethod.

FSR:Full-scalerange=±VREF/(2×PGA).

Calibrationaccuracyisonthelevelofnoisereducedby4(calibrationaverages16readings).

ThePGAoutputimpedanceandthemodulatorinputimpedanceresultsin–1%systematicgainerror(high-resolutionmode)and–0.5%error(low-powermode).

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ELECTRICALCHARACTERISTICS(continued)

Limitspecificationsat–40°Cto+85°C.Typicalspecificationsat+25°C,AVDD=+2.5V,AVSS=–2.5V,fCLK(1)=4.096MHz,VREFP=+2.5V,VREFN=–2.5V,DVDD=+3.3V,CAPN–CAPP=10nF,PGA=1,High-ResolutionMode,andfDATA=1000SPS,unlessotherwisenoted.

ADS1282

PARAMETER

DCPERFORMANCE(continued)GaindriftGainmatching(9)

Common-moderejectionPower-supplyrejection

VOLTAGEREFERENCEINPUTSReferenceinputvoltageNegativereferenceinputPositivereferenceinputReferenceinputimpedanceDIGITALFILTERRESPONSEPassbandripplePassband(–0.01dB)Bandwidth(–3dB)High-passfiltercornerStopbandattenuationStopbandGroupdelay

Settlingtime(latency)DIGITALINPUT/OUTPUTVIHVILVOHVOL

InputleakageClockinputSerialclockrate

fCLKfSCLK

IOH=1mAIOL=1mA010.8×DVDDDGND0.8×DVDD

0.2×DVDD

±104.096fCLK/2DVDD0.2×DVDD

VVVVmAMHzMHz

Minimumphasefilter(12)

LinearphasefilterMinimumphasefilterLinearphasefilter

(11)

CONDITIONSPGA=1PGA=16fCM=60Hz

AVDD,AVSS

DVDD

(10)

MINTYP290.3

MAXUNITppm/°Cppm/°C

0.8%dBdB

958090

11090115

(AVDD–AVSS)

+0.2VREFP–0.5AVDD+0.1

85170

±0.003

0.375×fDATA0.413×fDATA

fPS=60Hz(10)

(VREF=VREFP–VREFN)

VREFNVREFP

High-resolutionmodeLow-powermode

0.5AVSS–0.1VREFN+0.5

5VVVkΩkΩdBHzHz

0.1135

0.500×fDATA

5/fDATA31/fDATA62/fDATA62/fDATA

10HzdBHzss

(9)GainmatchrelativetoPGA=1.

(10)fCMistheinputcommon-modefrequency.fPSisthepower-supplyfrequency.

(11)InputfrequenciesintherangeofNfCLK/512±fDATA/2(N=1,2,3...)canmixwiththemodulatorchoppingclock.Inthesefrequency

rangesintermodulation=120dB,typ.(12)Atdc;seeFigure49.

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ELECTRICALCHARACTERISTICS(continued)

Limitspecificationsat–40°Cto+85°C.Typicalspecificationsat+25°C,AVDD=+2.5V,AVSS=–2.5V,fCLK(1)=4.096MHz,VREFP=+2.5V,VREFN=–2.5V,DVDD=+3.3V,CAPN–CAPP=10nF,PGA=1,High-ResolutionMode,andfDATA=1000SPS,unlessotherwisenoted.

ADS1282

PARAMETERPOWERSUPPLYAVSSAVDDDVDD

High-resolutionmode

AVDD,AVSScurrent

Low-powermodeStandbymodePower-downmode

Allmodes

DVDDcurrent

ModulatormodeStandbymodePower-downmode

(13)

CONDITIONSMIN–2.6AVSS+4.75

1.65

TYPMAX0AVSS+5.25

3.6

UNITVVV|mA||mA||mA||mA|mAmAmAmAmWmWmWmW

4.53110.60.125125179010

6.54.215150.850153525250125

High-resolutionmode

Powerdissipation

Low-powermodeStandbymodePower-downmode

(13)CLKinputstopped.

TIMINGDIAGRAM

tSCLKSCLK

tDISTDIN

tDIHDDOUT

tDOPDtDOHDtSPWLtSCDLtSCDLtSPWHTIMINGREQUIREMENTS

AtTA=–40°Cto+85°CandDVDD=1.65Vto3.6V,unlessotherwisenoted.

PARAMETERDESCRIPTION

tSCLKtSPWH,tDISTtDIHDtDOPDtDOHDtSCDL

(1)(2)

L

MIN20.85050

MAX1610

UNITS1/fCLK1/fCLKnsns

SCLKperiod

SCLKpulsewidth,highandlow(1)

DINvalidtoSCLKrisingedge:setuptimeValidDINtoSCLKrisingedge:holdtime

SCLKfallingedgetovalidnewDOUT:propagationdelay(2)SCLKfallingedgetoDOUTinvalid:holdtime

FinalSCLKrisingedgeofcommandtofirstSCLKrisingedgeforregisterread/writedata.(Alsobetweenconsecutivecommands.)

100

024

nsns1/fCLK

HoldingSCLKlowfor64DRDYfallingedgesresetstheserialinterface.LoadonDOUT=20pF||100kΩ.

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DEVICEINFORMATION

TSSOP-28TopView

CLKSCLKDRDYDOUTDINDGNDMCLKM1M0SYNCMFLAGDGNDCAPNCAPP

1234567891011121314

ADS1282

2827262524232221201918171615

BYPASDGNDDVDDDGNDRESETPWDNVREFPVREFNAVSSAVDDAINN1AINP1AINN2AINP2

TERMINALFUNCTIONS

NAMECLKSCLKDRDYDOUTDINMCLK

NO.123457

FUNCTIONDigitalinputDigitalinputDigitaloutputDigitaloutputDigitalinputDigitalI/O

DESCRIPTIONMasterclockinputSerialclockinput

Datareadyoutput:readdataonfallingedge

SerialdataoutputSerialdatainput

Modulatorclockoutput;ifinmodulatormode:

MCLK:Modulatorclockoutput

Otherwise,thepinisanunusedinput(mustbetied).Modulatordataoutput1;ifinmodulatormode:

M1:Modulatordataoutput1

Otherwise,thepinisanunusedinput(mustbetied).Modulatordataoutput0;ifinmodulatormode:

M0:Modulatordataoutput0

Otherwise,thepinisanunusedinput(mustbetied).

Synchronizeinput

ModulatorOver-Rangeflag:0=normal,1=modulatorover-range

Digitalground,pin12isthekeygroundpoint

PGAoutputs:Connect10nFcapacitorfromCAPPtoCAPNPGAoutputs:Connect10nFcapacitorfromCAPPtoCAPN

Positiveanaloginput2Negativeanaloginput2Positiveanaloginput1Negativeanaloginput1PositiveanalogpowersupplyNegativeanalogpowersupplyNegativereferenceinputPositivereferenceinputPower-downinput,activelowResetinput,activelow

Digitalpowersupply:+1.8Vto+3.3V

Sub-regulatoroutput:Connect1mFcapacitortoDGND

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M18DigitalI/O

M0SYNCMFLAGDGNDCAPNCAPPAINP2AINN2AINP1AINN1AVDDAVSSVREFNVREFPPWDNRESETDVDDBYPAS

910116,12,25,27

1314151617181920212223242628

DigitalI/ODigitalinputDigitaloutputDigitalground

AnalogAnalogAnaloginputAnaloginputAnaloginputAnaloginputAnalogsupplyAnalogsupplyAnaloginputAnaloginputDigitalinputDigitalinputDigitalsupplyAnalog

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TYPICALCHARACTERISTICS

At+25°C,AVDD=+2.5V,AVSS=–2.5V,fCLK=4.096MHz,VREFP=+2.5V,VREFN=–2.5V,DVDD=+3.3V,CAPN–CAPP=10nF,PGA=1,High-ResolutionMode,andfDATA=1000SPS,unlessotherwisenoted.

OUTPUTSPECTRUMOUTPUTSPECTRUM

0-20-408192-Point󰀀FFTVIN=-0.5dBFS,󰀀31.25HzHigh-Resolution󰀀ModePGA󰀀=󰀀1THD󰀀=-124.0dB0-20-408192-Point󰀀FFTVIN=-0.5dBFS,󰀀31.25HzLow-Power󰀀ModePGA󰀀=󰀀1THD󰀀=-123.0dBAmplitude󰀀(dB)-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Amplitude󰀀(dB)-60-60-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Figure1.OUTPUTSPECTRUM

0-20-408192-Point󰀀FFTVIN=-20dBFS,󰀀31.25HzHigh-Resolution󰀀ModePGA󰀀=󰀀1THD󰀀=-120.1dB0-20-40Figure2.OUTPUTSPECTRUM

8192-Point󰀀FFTVIN=-20dBFS,󰀀31.25HzLow-Power󰀀ModePGA󰀀=󰀀1THD󰀀=-117.0dBAmplitude󰀀(dB)-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Amplitude󰀀(dB)-60-60-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Figure3.OUTPUTSPECTRUM

0-20-408192-Point󰀀FFTVIN=-0.5dBFS,󰀀31.25HzHigh-Resolution󰀀ModePGA󰀀=󰀀16THD󰀀=-122.4dB0-20-40Figure4.OUTPUTSPECTRUM

8192-Point󰀀FFTVIN=-0.5dBFS,󰀀31.25HzLow-Power󰀀ModePGA󰀀=󰀀16THD󰀀=-121.4dBAmplitude󰀀(dB)-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Amplitude󰀀(dB)-60-60-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Figure5.Figure6.

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TYPICALCHARACTERISTICS(continued)

At+25°C,AVDD=+2.5V,AVSS=–2.5V,fCLK=4.096MHz,VREFP=+2.5V,VREFN=–2.5V,DVDD=+3.3V,CAPN–CAPP=10nF,PGA=1,High-ResolutionMode,andfDATA=1000SPS,unlessotherwisenoted.

OUTPUTSPECTRUM

0-20-408192-Point󰀀FFTShorted󰀀InputHigh-Resolution󰀀ModeSNR󰀀=󰀀124.0dB0-20-40OUTPUTSPECTRUM

8192-Point󰀀FFTShorted󰀀InputLow-Power󰀀ModeSNR󰀀=󰀀121.0dBAmplitude󰀀(dB)-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Amplitude󰀀(dB)-60-60-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Figure7.OUTPUTSPECTRUM

0-20-408192-Point󰀀FFT20mVDCHigh-Resolution󰀀ModeSNR󰀀=󰀀124.2dB0-20-40Figure8.OUTPUTSPECTRUM

8192-Point󰀀FFT20mVDCLow-Power󰀀ModeSNR󰀀=󰀀121.3dBAmplitude󰀀(dB)-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Amplitude󰀀(dB)-60-60-80-100-120-140-160-180050100150200250300350400450Frequency󰀀(Hz)

500Figure9.

THDvsINPUTFREQUENCY

-100

THD󰀀Limited󰀀bySignal󰀀Generator126125

Figure10.

SNRvsTEMPERATURE

VIN=󰀀20mVDCHigh-Resolution󰀀Mode124123122121120

-55

Low-Power󰀀ModeTotal󰀀Harmonic󰀀Distortion󰀀(dB)-110-115-120-125-130

10

20

30

High-Resolution󰀀Mode,󰀀PGA󰀀=󰀀1Low-Power󰀀Mode,󰀀PGA󰀀=󰀀1High-ResolutionMode,󰀀PGA󰀀=󰀀8Low-Power󰀀Mode,󰀀PGA󰀀=󰀀8VIN=-0.5dBFS40506070Input󰀀Frequency󰀀(Hz)

80

90

100

Signal-to-Noise󰀀Ratio󰀀(dB)-105

-35-155

254565Temperature󰀀(°C)

85105125

Figure11.Figure12.

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TYPICALCHARACTERISTICS(continued)

At+25°C,AVDD=+2.5V,AVSS=–2.5V,fCLK=4.096MHz,VREFP=+2.5V,VREFN=–2.5V,DVDD=+3.3V,CAPN–CAPP=10nF,PGA=1,High-ResolutionMode,andfDATA=1000SPS,unlessotherwisenoted.

THDvsTEMPERATURE

-110

PGA󰀀=󰀀8VIN=󰀀31.25Hz,-0.5dBFSSNRvsREFERENCEVOLTAGE

High-Resolution󰀀Mode,󰀀PGA󰀀=󰀀1130125

High-Resolution󰀀Mode,󰀀PGA󰀀=󰀀8120115

Low-Power󰀀Mode,󰀀PGA󰀀=󰀀1110105

Low-Power󰀀Mode,󰀀PGA󰀀=󰀀8100

Total󰀀Harmonic󰀀Distortion󰀀(dB)-115

Low-Power󰀀Mode-120

-125

High-Resolution󰀀Mode-130

-55

Signal-to-Noise󰀀Ratio󰀀(dB)-35-155

254565Temperature󰀀(°C)

85105125

012

3VREF(V)

455.5

Figure13.

THDvsREFERENCEVOLTAGE

-110

High-Resolution󰀀Mode,󰀀PGA󰀀=󰀀8125124123122121120119

0

1

2

3VREF(V)

4

5

6

0.5

1.0

1.5

Figure14.

SNRvsCLOCKFREQUENCY

Total󰀀Harmonic󰀀Distortion󰀀(dB)Signal-to-Noise󰀀Ratio󰀀(dB)-115

Low-Power󰀀Mode,󰀀PGA󰀀=󰀀8-120

High-Resolution󰀀Mode-125

Low-Power󰀀ModeVIN=󰀀20mVDCData󰀀Rate󰀀=󰀀fCLK/40962.0

2.53.0fCLK(MHz)

3.5

4.0

4.5

Low-Power󰀀Mode,󰀀PGA󰀀=󰀀1High-Resolution󰀀Mode,󰀀PGA󰀀=󰀀1-130

Figure15.

THDvsCLOCKFREQUENCY

-110

PGA󰀀=󰀀8VIN=󰀀31.25Hz,-0.5dBFSData󰀀Rate󰀀=󰀀fCLK/4096130

Figure16.

CMRvsINPUTFREQUENCY

Common-Mode󰀀Rejection󰀀(dB)Total󰀀Harmonic󰀀Distortion󰀀(dB)12011010090

Low-Power󰀀Mode80

High-Resolution󰀀Mode70

-115

Low-Power󰀀Mode-120

-125

High-Resolution󰀀Mode-130

0.5

1.0

1.5

2.0

2.53.0fCLK(MHz)

3.5

4.0

4.5

10100

1k10kInput󰀀Frequency󰀀(Hz)

100k1M

Figure17.Figure18.

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TYPICALCHARACTERISTICS(continued)

At+25°C,AVDD=+2.5V,AVSS=–2.5V,fCLK=4.096MHz,VREFP=+2.5V,VREFN=–2.5V,DVDD=+3.3V,CAPN–CAPP=10nF,PGA=1,High-ResolutionMode,andfDATA=1000SPS,unlessotherwisenoted.

POWER-SUPPLYREJECTION

vsFREQUENCY

AVDDINLvsINPUTAMPLITUDE

4

140

DVDDPower-Supply󰀀Rejection󰀀(dB)Integral󰀀Nonlinearity󰀀(ppm)12010080604020010

100

1k10k100k

Power-Supply󰀀Frequency󰀀(Hz)

1M

AVSS32

PGA󰀀=󰀀210-1-2-3-4-100

-75

-50-2502550Input󰀀Amplitude󰀀(%󰀀Full-Scale)

75

100

PGA󰀀=󰀀8PGA󰀀=󰀀32Figure19.INLvsTEMPERATURE

4

0-20Figure20.

CROSSTALKOUTPUTSPECTRUM

Shorted󰀀Input8192-Point󰀀FFTAdjacent󰀀Channel󰀀VIN=-0.5dBFS,󰀀31.25HzIntegral󰀀Nonlinearity󰀀(ppm)3

-40Amplitude󰀀(dB)-35

-15

5

254565Temperature󰀀(°C)

85

105

125

-60-80-100-120-140-1602

1

0-55

-180050100150200250300350400450Frequency󰀀(Hz)

500Figure21.

POWERvsTEMPERATURE

30

High-Resolution󰀀Mode25

30

Figure22.

POWERvsCLOCKFREQUENCY

High-Resolution󰀀Mode252015105

Power󰀀(mW)Power󰀀(mW)Low-Power󰀀Mode20

Low-Power󰀀Mode15

10-55

0

-35

-15

5

254565Temperature󰀀(°C)

85

105

125

1.0

1.5

2.0

2.53.0fCLK(MHz)

3.5

4.0

4.5

Figure23.Figure24.

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