Texas Instruments ADS1178 Handleiding

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ADS1174

ADS1178

1

FEATURESDESCRIPTION

APPLICATIONS

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]

ADS1178

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

ADS1174

MODE

MODE

Eight

Digital

Filters

VREFPVREFN

Input2

Input1

Input4

Input3

DS

DS

DS

DS

ADS1174

ADS1178

www.ti.com

........................................................................................................................................SBAS373B–OCTOBER2007–REVISEDSEPTEMBER2008

Quad/Octal,SimultaneousSampling,16-BitAnalog-to-DigitalConverters

234

•SimultaneouslySampleFour/EightChannels

TheADS1174(quad)andADS1178(octal)are

multipledelta-sigma(ΔΣ)analog-to-digitalconverters

•SelectableOperatingModes:

(ADCs)withdataratesupto52ksamples-per-second

High-Speed:52kSPSDataRate,31mW/ch

(SPS),whichallowsynchronoussamplingoffourand

Low-Power:10kSPSDataRate,7mW/ch

eightchannels.Thesedevicesuseidentical

•ACPerformance:

packages,andarealsocompatiblewiththe

25kHzBandwidth

high-performance24-bitADS1274andADS1278,

97dBSNR

permittingdrop-inupgrades.

–105dBTHD

Thedelta-sigmaarchitectureoffersnearideal16-bit

•DCPerformance:

acperformance(97dBSNR,–105dBTHD,1LSB

2µV/°COffsetDrift

linearity)combinedwith0.005dBpassbandrippleand

2ppm/°CGainDrift

linearphaseresponse.

•DigitalFilter:

Thehigh-order,chopper-stabilizedmodulator

LinearPhaseResponse

achievesverylowdrift(2µV/°Coffset,2ppm/°Cgain)

PassbandRipple:±0.005dB

andlownoise(1LSB

PP

).Theon-chipfiniteimpulse

StopBandAttenuation:100dB

response(FIR)filterprovidesausablesignal

bandwidthupto90%oftheNyquistratewith100dB

•SelectableSPI™orFrameSyncSerial

ofstopbandattenuationwhilesuppressingmodulator

Interface

andsignalout-of-bandnoise.

•SimplePin-DrivenControl

Twooperatingmodesallowforoptimizationofspeed

•LowSamplingApertureError

andpower:High-speedmode(31mW/Chat52kSPS),

•Specifiedfrom–40°Cto+105°C

andLow-powermode(7mW/Chat10kSPS).

•AnalogSupply:5V

ASYNCinputcontrolpinallowsthedevice

•I/OSupply:1.8Vto3.3V

conversionstobestartedandsynchronizedtoan

•DigitalCoreSupply:1.8V

externalevent.SPIandFrame-Syncserialinterfaces

aresupported.Thedeviceisfullyspecifiedoverthe

extendedindustrialrange(–40°Cto+105°C)andis

availableinanHTQFP-64PowerPAD™package.

•3-PhasePowerMonitors

•DefibrillatorsandECGMonitors

•CoriolisFlowMeters

•Vibration/ModalAnalysis

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas

Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2PowerPADisatrademarkofTexasInstruments.

3SPIisatrademarkofMotorola,Inc.

4Allothertrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2007–2008,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties