• 请推荐抖动时钟分配芯片。

    能否推荐一款为AD9684芯片(500Msps)提供低抖动时钟分配器4路输出以上?AD9510抖动有275 fs,根据AD9864数据手册计算SNR不到60dB。是否有更优秀的芯片可推荐?

    谢谢!

  • RE: AD9874 - Random DC offset in IQ data

    Hello,

    Since the LNA is single-ended, it is susceptible to digital noise contamination that may come from the data path clocks as well as the SSI block.  If one refers to Figure 23b.................one can see the level of in-band spurious that still exists…

  • RE: Disable both LO synthesizer and clock synthesizer

    Hello,

    Hardware changes look good.

    Example script below is used for external CLK (18 MHz) and LO.  Note that the CLK SYN, LO SYN, and CLK Bias are powered down and a more robust LC/RC tank tuning procedure is used.  Please review the AD9864 datasheet  which…

  • AD9874: Test registers

    Our customer has some problems with TEST REGISTERS (0x37 ... 0x3E). The AD9874
    functionality depends on status of these registers, and they worked with these
    bits using hit-and-miss method, but now they want to get detailed description
    of these…

  • AD9874 PLL loop filters design

    Hi.

    I intend to use AD9874 in an HF radio receiver.
    Unfortunately, I could not design the loop filters of LO PLL and Clock PLL for AD9864, because ADIsimPLL does not provide its model in the list. Could you help me to carry out the design?

    I attach my…

  • RE: The question of using Visual Analog to evaluate AD9874

    Yes, I am sure using the "windowed FFT" and set to Blackman-Harris. Actually, I followed the quick start of the "AD9864/AD9874 EVB Evaluation Board User Guide", using the configuration as Figure 2a, the result of the windowed FFT is the same as…

  • RE: AD9874 -> LO synthesizer

    Hello,

    It does not appear that anything intrinsically is limiting the PFD frequency to be as low as 2 kHz.  I believe the min 6.25 KHz PFD frequency specification was set because the target application was for PMR radio where channel spacing was typically…

  • 关于ADRF665的使用

    技术工程师:你好!问二个问题,1、我想用ADRF6655混频器,这个型号的混频器带有Lo,可以通过改变Lo的频率设置,做成同时可选几个信号的选频混频器;2、用AD9864做中频ADC转换,从资料上看,AD9864是窄带的器件,如果做成选频后的窄带ADC转换可用吗?选频后有几个频率的信号。

  • RE: AD9874 BAND-PASS SIGMA-DELTA

    Hello,

    Please read datasheet carefully since it describes in great detail how the AD9874 works.  I would also advice you to look at the AD9864 datasheet that has been recently updated and provides good examples on the SPI initialization boot sequence…

  • RE: Using the bandpass sigma delta ADC in AD9874?

    Yes it is possible if you operate the ADC clock at 20.8 MSPS such that the IF2 is centered at 2.6 MHz.  Also you can refer to page 38 of the datasheet that describes such an application where the mixer's LO port is fixed to a DC bias voltage such th…