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DAC8750: Daisy chain mode

Y.Ottey
Mastermind 6145 points
Part Number: DAC8750

Dear all,

I would like to ask about Daisy chain mode in DAC8750's datasheet.

Our customer is considering using multiple DAC8750s in a Daisy chain connection (cascade connection).

They believe that when using a Daisy chain connection, if one of the DAC8750s breaks, the other DAC8750 will be out of control.

When you actually check the data sheet, you can see the following figure.

Looking at this figure, I believe that if one DAC8750 breaks down, communication via the serial interface is interrupted and other DAC8750s cannot be controlled.

Is this recognition correct?

Best Regards,

Y.Ottey

  • 0
    TI__Genius 14220 points

    Hi Y.Ottey,

    Thank you for your query. Due to the Thanksgiving holidays, most of the engineers are on vacation. Someone from our team will respond back to you on Monday.

    Regards,

    Uttam Sahu

    Applications Engineer, Precision DAC

  • 0 in reply to Uttam Sahu
    TI__Guru 53573 points

    Hi Y.Ottey,

    I guess this depends on the definition of "break".  If one of the DACs were unpowered, totally destroyed, or missing, then yes, this would break the chain.

    If a device was just in an error state, but the device was still correctly powered, then I would expect the chain to still function.

    Thanks,
    Paul

  • 0 in reply to Paul_Frost
    Mastermind 6145 points

    Dear Paul

    Thank you for your reply.

    I have additional questions about your answers.

    If a failed device (such as a device whose analog output is not output normally) can communicate with other devices, is it okay to recognize that other connected devices can control it?

    Regards,

    Y.Ottey

  • 0 in reply to Y.Ottey
    TI__Mastermind 46290 points

    Hello,

    As Paul has eluded to, it really just depends on the nature of the failure. If there is some kind of catastrophic damage (i.e. EOS or ESD damage) then most likely communication with all devices further down the chain will be lost. Similarly, if for some reason the digital core latched-up, then most likely data is no longer appearing on SDO you would be in the same situation.

    Concerning "a device whose analgo output is not output normally" - it would once again depend on exactly why the output is not normal.