• AD9957 CCI_OVFL

    Hello,

           I am now working a AD9957 project. I used ADF4360-6 to provide 619MHz REF_CLOCK,  I do not use ad9957 internal PLL,  The sync_clk is OK. I test the single tone mode is right, But when I use QDUC MODE ,there is no signal. I found when I set the…

  • 关于AD9957

    你好,ADI专家:

          我目前项目需求为输出8路150M中频,各路需要同步(输出相位差能相参),杂散优于60dBc;数据来源为FPGA,IQ数据,数据时钟100M,基带带宽低于30M,,目前DAC时钟为外部提供的800MHz。   

          问题1:通过ADI官网选型发现AD9957接口设计比较简单,想要选用,不知道这个DAC可否满足我的需求,,,多片同步是否可以实现相参。。。。

          问题2:ADI是否有更好解决方案,如直接可以单片实现双通道(AD9957一路一片,功耗也高),更低功耗,,的DAC可以满足我的需要…

  • AD9957+ADF4351+ADL5801

    Hi, everyone!

    I use AD9957+ADF4351+ADL5801 in an up-conversion application. The AD9957 generates a 50 MHz intermediate frequency signal which is sent to the RF port of the ADL5801; The ADF4351 provides a  1700 MHz LO, and the ADL5801 mixes the two signals…

  • AD9957 Output

    Hi, I am using the AD9957. I use the Blackfin mode QDUC. On the Q-channel I send 0x8000 and on the I-channel 0x0000. There is no output signal. But if I swap the data to I-channel 0x8000 and Q-channel 0x000 there is carrier visible? This is wierd. Can…

  • AD9957 modulation questions

    I'm a microwave guy trying to figure out if I it makes more sense to use the AD9957 instead of a traditional Direct I/Q modulator.  I already plan a dual conversion solution so your app not AN-0996 makes sense to me.  The critical parameters that I…

  • AD9957 DAC

    AD9957芯片中DAC_RSET手册中需要用1K欧姆的电阻下拉置地,由于个人前期设计的时候没有注意,把该信号直接接到FPGA管脚上,编译时给拉高了,我想问下这个时候是不是很容易就把芯片的DAC部分给烧坏???

  • DAC AD9957

    I am using AD9957 chip. I want to use it for the 200 MSPS data rate.

    I have applied 25 MHz of differential clock to as the REFCLK to the chip.

    In the SPI Register Map, I have enabled the PLL and I have chosen the VCO Band.

    But I am unable to find,…

  • AD9957 PLL

    Hi

             i am using 20 MHz external CLK for AD9957 PLL input, but it is not locking  for frequency 800 MHz.it gives a 20-30 MHz wide signal at pin no 55.  centered around 320 MHz.(pll loop filter BW=2.5 MHz,VCO=4)when i change the  VCO from 4 to 5,it results…

  • AD9957: maximum signal bandwidth

    In AD9957's datasheet, as figure 1 shown, the AD9957 output signal's bandwidth
    is about 10MHz. I want to know what the maximum signal bandwidth of AD9957 can
    process is.

     

    The maximum signal bandwidth is ~62MHz.
    Given a 1GHz…
  • AD9957 spurious output

    Hi,

    we are using AD9957 in QDUC at 350 MHz and we have sample rate harmonic spurs on output, with a PDCLK 96 MHz rate

    for a 96 MHZ sample rate.

    In the plot in the AD9957 datasheet I don't see this kind of spurs, could you suggest us something to limit…