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DAC8562: Bipolar Output Range Circuit Using DAC8562

Expert 1901 points
Part Number: DAC8562
Other Parts Discussed in Thread: DAC8563

Figure 99 of the data sheet for the DAC8562/DAC8563 shows a circuit for creating a bipolar output using the DAC8562.  I am curious why the DAC8562 was specifically chosen, and none of the other parts in the data sheet?  Since the DAC8562 resets to a value of zero, the output of the circuit would be -10V.  It seems the DAC8563 would be a better choice because it resets to a mid-scale value, and then the circuit would output 0V when reset.

Thanks,

Greg

  • Hi Greg,

    The application circuit for unipolar to bipolar conversion is generic in nature and the use of DAC8562 in Figure 99 of datasheet is just an example. You can look at the DAC8562EVM user guide (sbau183a.pdf) wherein the same circuit is made for the entire family of the DACx56x devices.

    Regards,
    Applications Engineer, Precision DACs
  • Thank you Uttam. I was hoping for more justification for why the DAC8562 was chosen for a bipolar circuit. Perhaps there are applications where you would want the output to be -10V at reset?

    Regards,

    Greg
  • Greg,

    Actually the circuit was really designed with DAC8563 in mind, but the product releases were a bit staggered such that the reset to zero products released first. As such, the circuit was published in the datasheet with the released device but, evidently, never changed.

  • Thanks Kevin. I was really wondering what type of application would require that behavior. I was hoping to learn about an interesting application, but your explanation makes a lot of sense. Thanks!

    Regards,

    Greg