Clockless DAC parallel single supply votage output needed

I am looking for a DAC that does not require a clock to update its output.  Parallel input (8 bits is sufficient), single supply (3.3 or 5 V), voltage output (rail to rail preferred), any speed, internal reference.  I would like its output voltage to continuously track and change whenever any of its inputs changes.  I have seen this referred to as a transparent DAC.


The AD7801 seems to come close.  It could be operated in Automatic Update Mode by tying LDAC to GND but then WR still needs to be clocked.

  • 0
    •  Analog Employees 
    on Feb 24, 2015 11:32 PM over 5 years ago

    Hi, Steve.

    A clock is very important to a converter. It is used to tell the part when to consider the data to be valid or not. Without it, the part should still have a way to tell whether the data that is sent to the register are valid or not. One way is to use manchester coding.

    I could imagine DAC's using manchester coding but unfortunately ADI do not have clockless DACs. You are correct on the AD7801. You may also take a look at ADI's DAC8562.



  • AD Linear Support suggested the AD7392/3 which does not have an internal reference.  Reference can be the supply voltage though.

    The TI DAC7621 device has my desired parameters including internal reference.  5V power with 0 to 4.095 V output.

  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:56 PM over 2 years ago
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

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