• Ad9779 Jitter

    Hi

    i have an AD9779 Digital to Analog Converter,the clock for the processing part is from clock of the converter produced,

    when i put the 1 MHZ with Sampling rate of 32 Mhz , Fadc/8 the Signal not trigged with OScope and seems have a jitter

    how can…

  • AD9779 Output Question

    Hello,

    We have a AD9779 in our design and we are supplying it data from an FPGA.  The data sent from the FPGA is either a CW (0, 0x7FFF, 0, 0x8001...) or broad band noise.  In the FPGA, we then "right" bit shift the data (maintaining the sign bit) in order…

  • AD9779使用疑问

    AD9779描述的是双通道I、Q两路,16位的DA芯片,是否可以作为两路、单独的DA通道使用,如果可以,需要特别关注那些配置;其二,如果不可以,AD公司的那些芯片可以作为两路、独立的DA通道使用。谢谢。

  • AD9779: Grounding and layout recommendation

    We have a DVB-T upconverter Design in progress, in which we use the AD9773.
    This DAC needs a digital and an analog supply and therefor a digital and a
    analog ground. In the layout of the evalboard which is mentioned in the
    datasheet,…
  • 关于AD9779的问题

    请教下各位,我使用FPGA出频率为30MHz的数字信号,数据速率为61.44MHz,给AD9779当输入,AD9779内部做122.88MHz的上变频,则有用信号会在152.88MHz处,但同时会在154.32MHz处有一幅度相差50dbc左右的杂散信号,请问下这有可能是哪里引起的,谢谢了!

  • AD9779 DAC: SYNC_I and initialization

    I have two questions regarding AD9779. I'm using it in a QAM modulator working at 160 Msps (28 Msymbols/s sampled 6 times per symbol). I don't use DATACLK output, the digital data going out of the FPGA is clocked with the same clock, that is…

  • AD9779 Data Rate and Clocking Architecture

    Question from customer


    The AD9779 maximum digital data rate and its clocking architecture to produce required center frequencies … DATA<->REFCLK<->InterPolation<->QImod<->fc? Can data be clocked by the REFCLK?


    Please advise…

  • AD9779/AD9779A 正交调制问题

    AD9779/AD9779A内部是否带I、Q正交调制功能,也就是说通过配置内部寄存器能否实现I、Q正交输出,而不需要使用外部IQ正交调制芯片,并且输出通过1或2通道输出。

  • 请教下AD9779的配置问题。

    请教下AD9779的配置问题。如果采样时钟是200MHz,内部不插值、不调制。FPGA输出信号8MHz,速率是200mbps,DA输出一直是4MHz和8MHz。幅度分别是8dBm和-10dBm。我想输出的频率是8MHz,为什么输出是4MHz。没搞明白。

  • 请教下AD9779的配置问题。

    请教下AD9779的配置问题。如果采样时钟是200MHz,内部不插值、不调制。FPGA输出信号8MHz,速率是200mbps,DA输出一直是4MHz和8MHz。幅度分别是8dBm和-10dBm。我想输出的频率是8MHz,为什么输出是4MHz。没搞明白。