Texas Instruments ADS7865 Handleiding

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S/H

Comparator

CDAC

Input

MUX

AV

DD

REF

IN

SAR

S/H

Comparator

CDAC

REF

OUT

AGND

SAR

10-BitDAC

2.5VReference

ParallelInterface

CHA0+

CHA0-

CHA1+

CHA1-

BV

DD

DB[11:0]

CS

CLOCK

WR

RD

BUSY

CONVST

BGND

CHB0+

CHB0-

CHB1+

CHB1-

Input

MUX

ADS7865

www.ti.com

SBAS441C–OCTOBER2008–REVISEDAPRIL2012

Dual,12-Bit,3+3or2+2Channel,SimultaneousSampling

Analog-to-DigitalConverter

CheckforSamples:ADS7865

1

FEATURES

DESCRIPTION

TheADS7865isadual,12-bit,2MSPSanalog-to-

2

•SixPseudo-orFourFullyDifferentialInputs

digitalconverter(ADC)withfourfullydifferentialorsix

•SNR:71.7dB,THD:–87dB

pseudo-differentialinputchannelsgroupedintotwo

•ProgrammableChannelSequencer

pairsforhigh-speed,simultaneoussignalacquisition.

Inputstothesample-and-hold(S/H)amplifiersare

•ProgrammableandBufferedInternal2.5V

fullydifferentialandaremaintaineddifferentiallyto

Reference

theinputoftheADC.Thisarchitectureprovides

•FlexiblePower-DownFeatures

excellentcommon-moderejectionof72dBat100kHz,

•VariablePower-SupplyRanges:2.7Vto5.5V

whichisacriticalperformancecharacteristicinnoisy

environments.

•Low-PowerOperation:44mWMaximumat5V

•OperatingTemperatureRange:

TheADS7865ispin-compatiblewiththeADS7862,

butoffersadditionalfeaturessuchasa

–40°Cto+125°C

programmablechannelsequencerandreference

•Pin-CompatibleUpgradefortheADS7862

output,flexiblesupplyvoltage(2.7Vto5.5VforAV

DD

andBV

DD

),apseudo-differentialinputmultiplexerwith

APPLICATIONS

threechannelsperADC,andseveralpower-down

features.

•MotorControl

•Multi-AxisPositioningSystems

TheADS7865isofferedinaTQFP-32package.Itis

specifiedovertheextendedoperatingtemperature

•Three-PhasePowerControl

rangeof–40°Cto+125°C.

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2008–2012,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties