• RE: AD9640 clocking

    the levels shown in the datasheet support lvds levels and more. so the lvds levels are pretty much a subset of the range explained in the datasheet.

  • AD9640 brd

    Hi, 

    From ADI website, we can get AD9640 Evaluation Board Family Gerber Files (Rev. C), please advise  where we can get the .brd file for reference. 

    Thanks.

    Matt

  • AD9640 output test mode.

    Dear all,

    Please help me.

    First, I use DRVDD = 1.8V, differential clock input, and the output test mode is OK.

    Then I swith to use DRVDD = 3.3V, single end clock input.

    The SPI read is OK, and I can read out Chip ID (address 0x01)

    But when I try…

  • AD9640: Maximum and minimum aperture delay

    Regarding the Timing Characteristics of the 9640D device, do you have more
    detailed data for the - APERTURE DELAY: i.e. MIN and MAX values, around the
    1.0ns typ stated on the datasheet - APERTURE DELAY VARIATION: i.e. between two
    channels…
  • Unused analog input of AD9640

    Hi,

    My customer is encountered that should be used only one of the two analog inputs of AD9640.

    In this case, what is the best solution to connect the unused analog input pins(VIN+/-A or VIN+/-B) ?

    Directly to ground or AC coupled to ground or Not…

  • CML connection of AD9640's unused AIN

    Hello,

    I had a question about unused AIN pin connection of AD9640 for my customer as below.

    Unused analog input of AD9640

    Unfortunately, my customer can not change the hardware on customized board. So, she can not exactly apply the recommended connection…

  • AD9640 ADC peak monitor 20-bit fixed-point number

    Regarding  RMS magnitude signal monitoring feature of AD9640 ADC, The datasheet says that,

    "For rms magnitude mode, the value in the signal monitor result (SMR) register is a 20-bit fixed-point number."

    How long is the word length and fraction…

  • ad9640的电压参考,没有看明白

      请教一下问题:主要是ad9640   datasheet第27页的Programmable Reference(如下datasheet中的截图),这种参考电压设计如何实现?

    通过参考电压数值公式,似乎只能通过调节R2和R1的数值来改变:一旦确定R2和R1的数值,参考电压就确定了。

    那么,datasheet中的第44页,memory map中的0x18寄存器中,reference voltage selection的设置,当外部R1和R2的数值确定了,修改该配置,还能改变AD的参考电压吗?

  • 关于AD9640差分时钟、模拟输入与PCB布局的使用疑问

    最近在使用AD9640进行硬件设计

    差分时钟部分:

    疑问1:datasheet在差分时钟部分提供的参数芯片是95xx系列,这些芯片是不是对输入的时钟信号质量要求也很高?在时钟次系列芯片的时候需要注意哪些事项?次部分的参考地是否需进行与模拟/数字地进行一定的隔离处理?

    疑问2:如果外部没有高精度的时钟源设备,是否有替代方案可以实现单端转差分时钟输出?并且时钟抖动质量可以在100fs-300fs之间?

    疑问3:是不是使用PLL类型的时钟发生器芯片带来的抖动误差会比较大?针对14位的ADC输入差分时钟有此类型的参考吗…

  • PECL input design of ADC clock

    My customer is considering PECL clock input for AD9640 and AD9643.

    The reference circuit of the AD9640 and AD9643 on the datasheet is differed from each other as follows.

    Please tell her what is the best solution for a 100 ohm termination resister…