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LTC2704-16 and DC752A-B

I would like to test SPI programming straight to the LTC2704-16 devboard but it looks like the only way to really demo the board is through this quick eval tool. I have the DC590B board also, but would like to do this without that board in the loop. Is there different interface documentation or sample code files for setting the DAC that exists outside of the user manuals for these boards?

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  • If you use the DC2026C to control the DC752A you can send custom code using the arduino platform, but it still involves a demo board.  

    Is your intent to drive the DAC from your own micro controller?  The SPI lines are all exposed, so if you have a controller you want to use you can just solder to the test points on the DC752.  

    Let me know more about your application and I'll try to help out. 

  • That is a good idea about tying into the test points. Thank you. Correct in your statement - we are adding the LTC2704 to a board which uses a different micro controller. Controlling this via arduino is probably not an option, but we do have a Netburner which we had hopes of using for controlling the DACs.

    Control of the DACs works by the way you mentioned, but the controller unit we have only supports 8 bit and 16 bit transmissions. From what I see with the 24 or 32bit loading sequence requirements detailed in the LTC2704 spec sheet, I am not sure that would work due to message misalignment. Will the LTC2704 support load sequences sent in 8bit or 16bit chunks if I hold the chip-select or do I have to de-assert after every transfer?

    Thanks for your response and any additional thoughts.

  • If you hold CS low then you can send data in chunks.  that is what we do with the DC590. 

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