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DAC8564: DAC with an full-scale output voltage of 5 V and internal reference

Manuel Christ
Prodigy 90 points
Part Number: DAC8564
Other Parts Discussed in Thread: DAC80504, DAC8568

Dear all,

Is there a newer type of DA converter than the DAC8564 or is it still active and preferred?

Is there a similar type of DA converter that is pin/function compatible but has a full-scale range of output voltage of 5 V? (If possible also with 18/20 bit?)

I saw the DAC 8568, but unfortunately it does not have a logic power supply.

(For our application we need a power supply input (AVDD) of 5 V and a Digital input-output power supply (IOVDD) of 3,3 V.

Thank you for your help.

Best regards

Manuel


  • 0
    TI__Mastermind 32808 points

    Hi Manuel,

    Yes, the DAC8564 is still active. If you share your key requirements then maybe we can find you a DAC that fits you requirements better. The DAC8568 logic input levels are VIL = 0.3*AVDD and VIH = 0.625*AVDD for a AVDD of 5V. This might work for your IOVDD of 3.3V if you are interested in the DAC8568. The DAC80504 is another similar 16-bit device that you can take a look at. 

    You can take a look at this list of our 18/20 bit DACs at this link here: https://www.ti.com/data-converters/dac-circuit/precision/products.html#p84=18;24

    Best,

    Katlynne Jones

  • 0 in reply to Katlynne Jones
    Prodigy 90 points

    Hi Katlynne,

    thank you for your fast answer. The DAC 80504 is also an interesting converter. 

    Unfortunately, the 80504 converter has a less accurate internal reference voltage than the DAC8564.
    The DAC8564 has a reference voltage range of 2.4975 V - 2.5025 V and a initial accuracy of ± 0,004 % or max. 0,1%.
    We also use the reference voltage for our analogue control, so it must be very accurate.
    Can you suggest another type of DAC,which has a more precise internal reference?

    What is the voltage output swing from rail of the DAC 8568 if we have an AVDD of 5 V?
    Or what supply voltage (AVDD) do we have to use, if we want 5 V on the output of all channels?

    We will carry out further tests with different DAC converters in our company.
    Thank you very much for your help.
    If I have any more questions, I'll get back to you.

    Best regards

    Manuel Christ

  • 0 in reply to Manuel Christ
    TI__Mastermind 32808 points

    Hi Manuel,

    You can see that an AVDD of 5.5V will support an output of 5V up to a few milliamps of load current. 

    The output amplifier section does say that the buffer is rail-to-rail and has a max output range of 0 to AVDD. I suspect there is still a small amount of required headroom that I don't see defined in the datasheet. It would be best to test the device under your system conditions to find out the required AVDD. 5.5V should work. 

    If you are looking for a DAC with at least 4 channels and an internal reference, then the DAC8564 or DAC8568 are the best choice for you. Please get back to me when you come across any other questions. 

    Best,

    Katlynne Jones