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DAC8760: How to use DAC8760 design 4-20mA circuit?

user4499359
Intellectual 450 points
Part Number: DAC8760
Other Parts Discussed in Thread: DAC8750

Dear Team: I have a project to design a 4-20mA output circuit. I found the chip, think DAC8760 more excellent. Want to use DAC8760 to design 4-20mA circuit. Read the manual and reference design, but not yet clear how to design the circuit we need. I only need 4-20mA circuit, do not know how to choose Vout and Iout pin relationship. I've looked at the reference design "16-Bit Analog Mixed Input and Output Module for Programmable Logic Controllers (PLCs)" and do not know how to modify it for circuits that generate only 4-20mA.

  • 0
    TI__Mastermind 46290 points
    Hello,

    The DAC8760 offers separate voltage and current outputs which may be enabled individually or simultaneously. When simultaneously enabled, both outputs are driven by the same DAC code.

    There is another device in the DAC8760 family of products called DAC8750 which includes the IOUT only, perhaps this is better suited to your needs.

    Hopefully this clarifies things for you.

    If you have further questions, it would be helpful if you could explain more details around your end application's needs.
  • 0 in reply to Kevin Duke
    Intellectual 450 points

    Hello,

    Consult with TI this figure is not connected to the HART module, as a 4-20mA circuit can? That is, HART-IN foot empty? Still need other treatment.

  • 0 in reply to user4499359
    TI__Mastermind 46290 points
    Hello,

    I believe your question is concerning what should be done with the HART-IN pin when it is not used. It is recommended, however not required, that this pin is AC coupled to ground - especially if the end equipment is deployed to an environment with particular concerns for EMC/EMI.