Texas Instruments ADS1226 Handleiding

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ADS1225

¨

¨

ADS1226

1

FEATURESDESCRIPTION

APPLICATIONS

MUX

SerialInterface

DS

ADC

VREFPVREFN

Buffer

AVDDDVDD

GNDMUX

ADS1226Only

AINP1

AINN1

AINP2

AINN2

DRDY/DOUT

SCLK

TEMPEN

START

Oscillator

MODE

BUFEN

ADS1225

ADS1226

www.ti.com

.......................................................................................................................................................SBAS346C–MAY2006–REVISEDJANUARY2009

24-BitAnalog-to-DigitalConverter

withOne-andTwo-ChannelDifferentialInputsandInternalOscillator

2

•100SPSDataRate(High-SpeedMode)

TheADS1225andADS1226are24-bitdelta-sigma

analog-to-digital(A/D)converters.Theyoffer

•Single-CycleSettling

excellentperformance,ease-of-use,andlowpowerin

•EasyConversionControlwithSTARTPin

asmall4mm×4mmQFNpackageandare

•AutomaticShutdown

well-suitedfordemandinghigh-resolution

•LowNoise:4µV

RMS

Noise(High-Resolutionmeasurements,especiallyinportableandother

space-savingandpower-constrainedapplications.

Mode)

•InputMultiplexerwithTwoDifferential

TheADS1225andADS1226convertoncommand

Channels(ADS1226)

usingadedicatedSTARTpin.Simplypulsethispinto

initiateaconversion.Dataisreadinasinglecyclefor

•VoltageReferenceSupportsRatiometric

retrievalovera2-wireserialinterfacethateasily

Measurements

connectstopopularmicrocontrollerslikethe

•Self-Calibrating

MSP430.Aftertheconversioncompletes,the

•SimpleRead-Only2-WireSerialInterface

ADS1225andADS1226automaticallyshutsdownall

circuitry.

•InternalHigh-ImpedanceInputBuffer

Internalfeaturesincludeatwo-channelmultiplexer

•InternalTemperatureSensor

(ADS1226),selectableinputbuffer,temperature

•InternalOscillator

sensor,andoscillator.Thefull-scalerangeisdefined

•Low-Power:1mWWhileOperating,<1µA

bytheexternalvoltagereferencewithsupport

DuringShutdown

providedforuptoa5Vdifferentialinputsignal.Two

operatingmodesallowforspeed(100SPSdatarate,

•AnalogandDigitalSupplies:2.7Vto5.5V

15µV

RMS

noise)orresolution(4µV

RMS

noise,16SPS

datarate).

•Hand-HeldInstrumentation

TheADS1225/6supports2.7to5.5Vanalogand

digitalsupplies.Powerconsumptionis1mWwhile

•PortableMedicalEquipment

convertingwith3Vsupplies.TheADS1225and

•IndustrialProcessControl

ADS1226arefullyspecifiedoveranextended

industrialtemperaturerangeof–40°Cto+105°C.

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas

Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2006–2009,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties