AD9914/AD9915 Super Nyquist Zones

Q 

Will these devices work in Super Nyquist zones?

 

A 

Yes, as with other DDS products, you will likely want to use a bandpass filter
if you plan to go Super Nyquist.

Comments
Anonymous
Parents

  • Hi Guru !
    Could you plese specify the document concerning AD9914 where confirmed this statement ? ( Yes, as with other DDS products, you will likely want to use a bandpass filter if you plan to go Super Nyquist.)
    We can't find any statements concerning Super Nyquist in the datasheet. The datasheet says - the max frquency is 1.4GHz. (p.3 datasheet)
    We we would appreciate if you can send a reference of make a document confirmed that.
    Concerning the real situation - our quality dept. referenced to datasheet and not allowed use 9914 in Super Niqvist.
    The real conditions ( input signal 900MHz, comparing frequency 2800МHz, output signal = 900+2800=3700 MHz 3-ed Niqist zone)
    Also , could you please confirm that 9914 has not any internal filters rejecting the the signal higher than 1.4GHz.

Comment

  • Hi Guru !
    Could you plese specify the document concerning AD9914 where confirmed this statement ? ( Yes, as with other DDS products, you will likely want to use a bandpass filter if you plan to go Super Nyquist.)
    We can't find any statements concerning Super Nyquist in the datasheet. The datasheet says - the max frquency is 1.4GHz. (p.3 datasheet)
    We we would appreciate if you can send a reference of make a document confirmed that.
    Concerning the real situation - our quality dept. referenced to datasheet and not allowed use 9914 in Super Niqvist.
    The real conditions ( input signal 900MHz, comparing frequency 2800МHz, output signal = 900+2800=3700 MHz 3-ed Niqist zone)
    Also , could you please confirm that 9914 has not any internal filters rejecting the the signal higher than 1.4GHz.

Children
  • in reply to ilyin

    Sorry this has caused you trouble, it's the first I have heard of this text being an issue for anyone.  I don't there is any official document outside of this note on Engineer Zone confirming the device works in Super Nyquist.  I can confirm that there is no internal filter function on the DDS.  The 1.4 GHz max is intended as a guideline for customers.  Frequencies up to even 1.75 GHz are possible on the fundamental, but they make for either a very challenging filter design, very high spurs, or both.

    Please note that the AD9914 is subject to export restrictions and may require an export license in order for you to acquire it.

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