Texas Instruments ADS7868 Bedienungsanleitung

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FEATURES

APPLICATIONS

DESCRIPTION

_

+

CDAC

SAR

Conversion

and

Control

Logic

Comparator

12/10/8 BIT ADC

VIN

REF/V

DD

CS

SCLK

SDO

GND

S/H

ADS7866

ADS7867

ADS7868

SLAS465–JUNE2005

1.2-V,12-/10-/8-BIT,200-KSPS/100-KSPS,MICRO-POWER,MINIATURE

ANALOG-TO-DIGITALCONVERTERWITHSERIALINTERFACE

Thesampling,conversion,andactivationofdigital

outputSDOareinitiatedonthefallingedgeofCS.

•Single1.2-Vto3.6-VSupplyOperation

TheserialclockSCLKisusedforcontrollingthe

•HighThroughput

conversionrateandshiftingdataoutoftheconverter.

Furthermore,SCLKprovidesamechanismtoallow

–200/240/280KSPSfor12/10/8-BitV

DD

≥1.6V

digitalhostprocessorstosynchronizewiththecon-

–100/120/140KSPSfor12/10/8-BitV

DD

≥1.2V

verter.Theseconvertersinterfacewith

•±1.5LSBINL,12-BitNMC(ADS7866)

micro-processorsorDSPsthroughahigh-speedSPI

•71dBSNR,–83dBTHDatf

IN

=30kHz

compatibleserialinterface.Therearenopipeline

delaysassociatedwiththedevice.

(ADS7866)

•SynchronizedConversionwithSCLK

Theminimumconversiontimeisdeterminedbythe

frequencyoftheserialclockinput,SCLK,whilethe

•SPICompatibleSerialInterface

maximumfrequencyofSCLKisdeterminedbythe

•NoPipelineDelays

minimumsamplingtimerequiredtochargetheinput

•LowPower

capacitanceto12/10/8-bitaccuracyforthe

ADS7866/67/68,respectively.Themaximum

–1.39mWTypat200KSPS,V

DD

=3.6V

throughputisdeterminedbyhowoftenaconversion

–0.39mWTypat200KSPS,V

DD

=1.6V

isinitiatedwhentheminimumsamplingtimeismet

–0.22mWTypat100KSPS,V

DD

=1.2V

andthemaximumSCLKfrequencyisused.Each

•AutoPower-Down:8nATyp,300nAMax

deviceautomaticallypowersdownaftereachconver-

sion,whichallowseachdevicetosavepowerwhen

•0VtoV

DD

UnipolarInputRange

thethroughputisreducedwhileusingthemaximum

•6-PinSOT-23Package

SCLKfrequency.

Theconverterreferenceistakeninternallyfromthe

supply.Hence,theanaloginputrangeforthese

•BatteryPoweredSystems

devicesis0VtoV

DD

.

•IsolatedDataAcquisition

Thesedevicesareavailableina6-pinSOT-23

•MedicalInstruments

packageandarecharacterizedovertheindustrial

•PortableCommunication

–40°Cto85°Ctemperaturerange.

•PortableDataAcquisitionSystems

•AutomaticTestEquipment

TheADS7866/67/68arelowpower,miniature,

12/10/8-bitA/Dconverterseachwithaunipolar,

single-endedinput.Thesedevicescanoperatefroma

single1.6Vto3.6Vsupplywitha200-KSPS

throughputforADS7866.Inaddition,thesedevices

canmaintainatleasta100-KSPSthroughputwitha

supplyaslowas1.2V.

Micro-PowerMiniatureSARConverterFamily

RESOLUTION/SPEED<200KSPS1MSPS–1.25MSPS

12-BitADS7866(1.2V

DD

to3.6V

DD

)ADS7886(2.35V

DD

to5.25V

DD

)

10-BitADS7867(1.2V

DD

to3.6V

DD

)ADS7887(2.35V

DD

to5.25V

DD

)

8-BitADS7868(1.2V

DD

to3.6V

DD

)ADS7888(2.35V

DD

to5.25V

DD

)

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas

Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2005,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Produktspezifikationen