Texas Instruments DAC8740H Handleiding

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MUX

Digital Interface

UART (DAC8740H), SPI

(DAC8741H),

UART/SPI (DAC8742H)

HART

PA/FF

Transmit

Modulator

Receive

Demodulator

DAC

Buffer

Carrier

Detect

Bandpass

Filter

Clock

Generator

Precision

Oscillator

Voltage

Reference

CLK_CFG1CLKOCLK_CFG0XENX2X1REFREF_EN

MOD_OUT

MOD_INF

MOD_IN

IOVDDAVDD

DGNDAGNDBPFEN

UART_RTS / SCLK

UART_OUT / SDO

DUPLEX / SDI

UART_IN / CS

CD / IRQ

RST

REG_CAP

IF_SEL

Product

Folder

Order

Now

Technical

Documents

Tools &

Software

Support &

Community

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

DAC8740H

,

DAC8741H

SBAS856D–JUNE2017–REVISEDMAY2019

DAC874xHHART

®

andFOUNDATIONFieldbus™andPROFIBUSPAModems

1

1Features

1

•HART-compliantphysicallayermodem

–1200-Hz,2200-HzHARTFSKsinusoids

–RegisterprogrammableamplitudeofTX

signals(DAC8741Honly)

–IntegratedRXdemodulatorandband-pass

filterwithminimalexternalcomponents

•FOUNDATIONFieldbuscompatibleH1controller

andmediumattachmentunit(MAU)

–31.25kbit/scommunicationbasedon

Manchester-codedbuspowered(MBP)

–IntegratedManchesterencoderanddecoder

–CompatiblewithPROFIBUSPA

•Lowquiescentcurrent:180µAmaxattypical

industrialoperatingtemperaturerange(–40°Cto

+85°C)

•Integrated1.5-Vreference

•Flexibleclockingoptions

–Internaloscillator

–Externalcrystaloscillator

–ExternalCMOSclock

•Digitalinterface

–DAC8740H:UART

–DAC8741H:SPI

•Reliability:CRCbiterrorchecking,watchdogtimer

(DAC8741Honly)

•Wideoperatingtemperature:–55°Cto+125°C

•4-mm×4-mmQFNpackage

2Applications

•Industrialprocesscontrolandautomation

•PLCorDCSI/Omodules

•Fieldandsensortransmitters

3Description

TheDAC8740HandDAC8741H(DAC874xH)are

HART

®

,FOUNDATIONFieldbus™,andPROFIBUS

PAcompatiblelow-powermodemsdesignedfor

industrialprocesscontrolandindustrial-automation

applications.

InHARTmode,theDAC874xHintegratesallofthe

requiredcircuitrytooperateashalf-duplexHART

physicallayermodems,ineitherslaveormaster

configurationswithminimalexternalcomponentsfor

filtering.InFOUNDATIONFieldbusmode,the

DAC874xHintegratesalloftherequiredcircuitryto

operateashalf-duplexFOUNDATIONFieldbus

compatibleH1controllersandMAUs.

TheHART,FOUNDATIONFieldbus,orPROFIBUS

PA,datastreamcanbetransferredfromthe

microcontrollerthrougheitheraUARTinterfaceoran

integratedFIFOaccessedbyaSPIinterface.The

SPIinterfaceincludesanSDOpinfordaisy-chain

support,variousinterrupts,andotherextended

features.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

DAC8740HVQFN(24)4mm×4mm

DAC8741HVQFN(24)4mm×4mm

(1)Forallavailablepackages,seethepackageoptionaddendum

attheendofthedatasheet.

SimplifiedSchematic

Product specificaties