• RE: AD9859 spurs

    Ok, just any later. For this moment, I returned AD9951 to differential output mode (firstly measured with single-ended) and with source of 24,575 MHz and 16x multiplier I cannot see any spurs. Spectrum is clear!! That is enough for me, and says that it…

  • RE: AD9859 datasheet unclear at ASF register

    Hi Zuzu,

    The AD9859 is a derivative of the AD9954 DDS. Same die but bonded differently. The AD9954 has a 14 bit DAC and 14 bits of amplitude scale factor. The AD9859 data sheet was modified from the AD9954 data sheet for efficiency. However, the AD9859…

  • AD9859 DAC and I2c


    I am connecting AD9859 with PIC16f876A on i2c. AD9859 works on 1.8v to 3.3v. i2c signal is ok according to timming diagrams. all the coltrol signal are according to the application note. the problem i faced is that sometimes its works(i get a Clock…

  • RE: Replacing AD9951

    The only near pin-for-pin compatible parts are the ones in the same family: AD9951-AD9956 & AD9859.  However they all have the same MAX system clock spec of 400MHz.  The next highest SYSCLK DDS parts after this are the AD9911, AD9958, and AD9959 at…

  • Can I use the AD9859 without using external components to create a square wave?

    Can I use the AD9859 without using external components to create a square wave?


    The AD9859 cannot generate a square wave clock.

    In order to use on of our DDS devices, (some of  which have a resolution of 48
    bits), the reference frequency…
  • AD9859 REFCLK


    I have a 20MHz OCXO already on the board and want to use the CMOS output as an input for the AD9859 but i'm not quite sure if i calculated the levels correctly:

    The clock is a 0V - 3.3V square wave so i divide the clock voltage by 2 (resistors)…

  • AD9859 latency


    AD9859 Datasheet have  latency spec in below  description.(only min)

    I think that latency  [SYSCLK  Cycles] is decided by logic and these don't have dispersion.

    Are there some dispersion in these specifications.

    If  these have dispersion, how…

  • Manual for AD9859

    I am looking for a manual/guide for the "AD9859 & AD9951-54 Evaluation Software Version 1.0.1". Thanks

  • AD9859 not working

    Hello. i'm working in a design with a AD9589 that i haven't design. i have built the PCB but the device is nor working correctly. I attach a PDF with the schematic if you see any issue.

    The device is correctly supplied but in the pin IOUT i…

  • AD9859 Problem

    Hi, i'm actually a French student in electronic,

    I've been placed on a project which need a regulable sinusoïde, so i choose the AD9859 with a ADuC7026 to control it.

    And whenever i send a reading request the DDS answer unexpected content.