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DAC8750: 4 to 20mA Sink Curren-Loop for 4-wire

Michael Jeong1
Expert 2600 points
Part Number: DAC8750
Other Parts Discussed in Thread: TIPD101, TIPD102, DAC8771

Hello Expert,

I have some question for configuration about below.

Could you please check and send it guide and document?

The DAC8750 is currently being used as the Source Current-Loop.

1) Is there any problem with ‘4to20mA Sink Current-Loop’ 4-wire configuration through DAC8750?

2) If there is no problem, is there a guide and reference document on how to configure it?

Best Regards,

Michael

  • 0
    TI__Guru* 93215 points

    Michael,


    The DAC8750 is used typically for current sourcing and not for current sinking and I don't know of any particular design guide for using that device to sink current in that particular application. I'm sure it's possible to create a design to sink current. There are a couple of designs shown for TIPD101 and TIPD102 show how to create a current source. I'm sure they could be modified to create a similar side current sink.

    Instead of the DAC8750, you could use the DAC8771. This device has both current and voltage outputs. All of these outputs can be operated in a bipolar mode. In particular, the current range can be set to ±24mA, meaning that the outputs can be set to source or sink. It does have an integrated buck boost converter for the supplies, but separate external supplies can be used.


    Joseph Wu