AD5621 question

Hello,

What is the maximum frequency 3.3Vp-p sine wave that I can expect to generate with the AD5621?

Thanks,

Jarrod

  • 0
    •  Analog Employees 
    on Jul 14, 2014 10:12 PM

    Hi Jarrod,

    I have moved this to Precision DACs community.

    My understanding is that you want to create a sine wave using a DAC.

    You may use the following to get a rough estimate of the maximum frequency of the 3.3V sine wave.

    Using the timing characteristics, you may compute how much time a single command should take.

    Assuming that you will be using all the codes, the maximum frequency that you can generate is around 427Hz. This is not tested though. I based the figures in the timing characteristics and and come up with a theoretical answer.

    Regards,

    Mark

  • Hi, thanks for the reply. I think something is wrong in your calculations. From testing, I am able to generate a 25-30kHz sinusoid. See attached plot.yellow trace is input, red is output of DAC. Also attached is a capture using a 50kHz sinusoid test signal. The analog input signal was converted using an AD7476 and then the sample was sent to the AD5621 DAC.

    Although you are correct in that the data transfer rate will limit the update rate of the DAC, I also believe the maximum frequency that I can generate is slew rate dependent as well.........

    It would be nice to understand how to calculate the maximum frequency that I can generate using the DAC theoretically.

    jarrod

  • 0
    •  Analog Employees 
    on Aug 2, 2018 2:42 PM
    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.

    Thank you,
    EZ Admin