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AD5760 Supply Range

The AD5760 datasheet indicates that Vdd can be as high as 30.5V with Vss being -2.5V. This falls within the listed absolute maximum ratings, however the pin descriptions and other product literature indicate that Vdd and Vss are +/- 16.5V. Would the device still function correctly given Vss of -3V and Vdd of +28V? Thanks for your help in advance.

  • Hi,

    Yes, the device would still be functional but specifications of the AD5760 cannot be guaranteed.

    Also, please take note that the references should not exceed the supplies.

    Regards,

    Mark

  • Thanks for your helpful reply!

    Apologies - I'm still a student - but I'm not sure what you mean by "cannot be guaranteed". Does my use of an offset supply voltage derate the AD5760 in some way?

    I'm intending to use the part in a 0-25V system, so that would be the voltage given to the reference inputs.

  • Hi,

    For example, the DNL (differential Nonlinearity) Error of the part can change from -0.5 LSB to +0.5 LSB.

    This error can only be guaranteed for B grade parts with VDD = +12.5 V to +16.5 V, VSS = −16.5 V to −12.5 V, VREFx = ±10 V, +10 V and +5 V, VCC = 2.7 V to 5.5 V, IOVCC = 1.71 V to 5.5 V. If you are going to use the 0-25 V system, we cannot guarantee that the part will still have the -0.5 LSB to +0.5 LSB DNL Error. Although the part is still guaranteed to work, certain specifications cannot be guaranteed. This is because the specifications are not evaluated in the specific supplies that you want to use (i.e. 0-25 V). 

    Hope this clarifies your question.

    Regards,

    Mark

  • Thanks again!

    Is there perhaps a DAC that is more suitable for use in a 0-25V system than the AD5760? Ideally the INL+DNL (the system will be calibrated for offset + gain errors) will be less than ± 2.6 LSBs @ 16 bits. If not, I'll likely just end up using the AD5760 and hoping that the INL+DNL remain within those limits.

  • Hi,

    The AD5760 is one of the single channel 16-bit DACs that have the good INL+DNL values. To be able to assist you better, I have some questions to be able to understand where the requirements are coming from. This way, I could suggest DACs that might be able to fit in your requirements more easily.

    • Would you be able to share your application?
    • What output levels are you expecting your DAC to have?
    • What reference level are you planning on having?

    Regards,

    Mark

  • Hi!

    The application is a precision power supply, that would ideally be able to replicate low-frequency signals (A few KHz) but that's not a strict requirement for the device. The output voltage is 0-25 V. I've realized that I was being a bit silly about certain aspects of the design, so the AD5760 is no longer the DAC I'm looking at. It will have a 5V reference and a multiplication by 5 at some point. I was initially going to multiply the reference, but I've realized that multiplying the DAC output would be a better choice. Right now it seems like the AD5602 would be suitable.

    Thanks so much for your help,

    Ben

  • Hi,

    Great to be of help. Let us know if you have any further questions or need anything of assistance.

    Cheers!

    Mark