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VREFPVREFNAVDDDVDD

TEST[1:0]

FORMAT[2:0]

CLK

SYNC

PWDN[8:1]

CLKDIV

Control

Logic

SPI

and

Frame-

Sync

Interface

IOVDD

DGNDAGND

DRDY/FSYNC

SCLK

DOUT[8:1]

DIN

Input2

Input1

Input4

Input3

Input6

Input5

Input8

Input7

DS

DS

DS

DS

DS

DS

DS

DS

PWDN[4:1]

ADS1278

Four

Digital

Filters

AVDDDVDD

TEST[1:0]

FORMAT[2:0]

CLK

SYNC

CLKDIV

Control

Logic

SPI

and

Frame-

Sync

Interface

IOVDD

DGNDAGND

DRDY/FSYNC

SCLK

DOUT[4:1]

DIN

ADS1274

MODE[1:0]

MODE[1:0]

Eight

Digital

Filters

VREFPVREFN

Input2

Input1

Input4

Input3

DS

DS

DS

DS

ADS1274

ADS1278

www.ti.com

SBAS367F–JUNE2007–REVISEDFEBRUARY2011

Quad/Octal,SimultaneousSampling,24-BitAnalog-to-DigitalConverters

CheckforSamples:ADS1274,ADS1278

1

FEATURES

DESCRIPTION

234

•SimultaneouslyMeasureFour/EightChannels

Basedonthesingle-channelADS1271,theADS1274

(quad)andADS1278(octal)are24-bit,delta-sigma

•Upto144kSPSDataRate

(ΔΣ)analog-to-digitalconverters(ADCs)withdata

•ACPerformance:

ratesupto144ksamplespersecond(SPS),allowing

70kHzBandwidth

simultaneoussamplingoffouroreightchannels.The

111dBSNR(High-ResolutionMode)

devicesareofferedinidenticalpackages,permitting

–108dBTHD

drop-inexpandability.

•DCAccuracy:

Traditionally,industrialdelta-sigmaADCsoffering

0.8μV/°COffsetDrift

gooddriftperformanceusedigitalfilterswithlarge

1.3ppm/°CGainDrift

passbanddroop.Asaresult,theyhavelimitedsignal

•SelectableOperatingModes:

bandwidthandaremostlysuitedfordc

High-Speed:144kSPS,106dBSNRmeasurements.High-resolutionADCsinaudio

applicationsofferlargerusablebandwidths,butthe

High-Resolution:52kSPS,111dBSNR

offsetanddriftspecificationsaresignificantlyweaker

Low-Power:52kSPS,31mW/ch

thanrespectiveindustrialcounterparts.TheADS1274

Low-Speed:10kSPS,7mW/ch

andADS1278combinethesetypesofconverters,

•LinearPhaseDigitalFilter

allowinghigh-precisionindustrialmeasurementwith

•SPI™orFrame-SyncSerialInterface

excellentdcandacspecifications.

•LowSamplingApertureError

Thehigh-order,chopper-stabilizedmodulator

•ModulatorOutputOption(digitalfilterbypass)

achievesverylowdriftwithlowin-bandnoise.The

onboarddecimationfiltersuppressesmodulatorand

•AnalogSupply:5V

signalout-of-bandnoise.TheseADCsprovidea

•DigitalCore:1.8V

usablesignalbandwidthupto90%oftheNyquist

•I/OSupply:1.8Vto3.3V

ratewithlessthan0.005dBofripple.

Fouroperatingmodesallowforoptimizationofspeed,

APPLICATIONS

resolution,andpower.Alloperationsarecontrolled

•Vibration/ModalAnalysis

directlybypins;therearenoregisterstoprogram.

•Multi-ChannelDataAcquisition

Thedevicesarefullyspecifiedovertheextended

industrialrange(–40°Cto+105°C)andareavailable

•Acoustics/DynamicStrainGauges

inanHTQFP-64PowerPAD™package.

•PressureSensors

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas

Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2PowerPADisatrademarkofTexasInstruments,Inc.

3SPIisatrademarkofMotorola,Inc.

4Allothertrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

©2007–2011,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspecifikationer