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DAC8565: The solution is OPA4188+DAC8565. Can you kindly help me review it?

user5707026
Genius 3145 points
Part Number: DAC8565
Other Parts Discussed in Thread: OPA4188,

Dears

We need 4-20mA output, and designed this schematic. The solution is OPA4188+DAC8565. Can you kindly help me review it?

Looking forward to your reply.

Thanks

Elsa Duan

  • 0
    TI__Mastermind 18546 points

    Hi,

    In DAC section, you can ground Vref_L if you are not intended to drive the Vref_L input.

    As I understand from the post, you want to generate 4-20mA output corresponding to what range of DAC output voltage?

    I assume100 ohms acting as the sense resistor here. if that's the case the voltage across the sense will be a replica of input itself.

    Current through 100ohms will be Vinput/100.

    You may need to add offset to get 4mA when your DAC input is at 0V. If your intention is to design a loop powered transmitter, we have lot of reference designs available to help, or you can have a look at XTR devices.

    https://www.ti.com/product/XTR117?keyMatch=XTR117&tisearch=Search-EN-everything&usecase=GPN

    Regards,

    AK