AD9914: FAQ

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    32-bit Resolution or 64-bit Resolution Mode

    Question Why would I use the device in 32-bit resolution mode if I can get 64 bits or resolution in programmable modulus mode? Answer Using programmable modulus mode requires the auxiliary accumulator…
  • Article

    Achieving optimal performance from the AD9914/AD9915

    Question Are there conditions that will help the part reach its best performance? Answer Yes, if you can provide a digital power supply which holds to 1.8V+5%/-0%, and if you can keep the part cooled…
  • Article

    AD9914 - connection to an uC

    Question Could you please send me the source code for the AD9914 Eval Board? Answer I do not believe the software source code is what your customer needs. Instead, I am sending you some of the code we…
  • Article

    AD9914 pahse wheel and spur relationship and synchronisation query

    Question looking for info wrt (a) on phase truncation spurs sampled data points mapped on to a 32-bit phase wheel lookup table. (b) synchronisation pins, SYNC_IN and SYNC_OUT. Answer Please note…
  • Article

    AD9914/AD9915 : AM Pulse, CW and Clocking, Synchronization

    Question Hi Analog, We are looking at using the AD9914 as the primary component in a pulsed system, 4MHz to 1GHz. 1. Have you a recommended clock source (for internal PLL)? 2. How flexible is the AM programming…
  • Article

    AD9914/AD9915 Programmable Modulus Mode Tuning Resolution

    Question When using programmable modulus mode, is the tuning resolution listed the same no matter what sample frequency I use? Answer No. The absolute resolution is calculated as FSAM/2^64, though even…
  • Article

    AD9914/AD9915 REFCLK Multiplier

    Question How good is the AD9914/AD9915 REFCLK multiplier? Answer It’s better, at least a little, than those on previous DDS products, but it will still limit your performance compared to a very clean…
  • Article

    AD9914/AD9915 SFDR Specification

    Question Why is the AD9915 SFDR specification better than the AD9914? Answer Because as the sample rate increases, it is more challenging to hold to good SFDR. If you use the AD9914 at 2.5GHz or less…
  • Article

    AD9914/AD9915 Super Nyquist Zones

    Question Will these devices work in Super Nyquist zones? Answer Yes, as with other DDS products, you will likely want to use a bandpass filter if you plan to go Super Nyquist.
  • Article

    AD9914: AM Pulse and Clocking Discussion

    Question We are looking at using the AD9914 as the primary component in a pulsed system, 4MHz to 1Ghz. Have you a recommended clock source (for internal PLL)? How flexible is the AM programming i.e. sinc…

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