• 关于AD9240

    我的AD9240工作在0~5V输入范围,采样结果比实际输入差0.1伏,请问可能是什么原因?

  • Driving AD9240

    Our application is driving the AD9240 14 bit 10MHz A/D.This is an instrumentation application so settling time, low noise and low drift are the more critical parameter. The goal is to have switchable gains up to 1000x using multiple stages. The input…

  • AD9240 data collectoin problem

    Hello,

    I use AC coupling  mode as follows, (AVDD = +5 V, DVDD= +5 V, DRVDD = +3.3 V, fSAMPLE =5 MSPS, RBIAS = 2 k, VREF = 2.5 V

    I use an oscilloscope to measure the "A", "B" and "C". The input signal(As shown in point "A"…

  • AD9240故障

           在交付的一套产品中,出现A/D采集故障,针对故障情况,采用故障板卡和正常板卡进行对比测试,请帮忙分析一下,这种情况是什么故障,可能原因有哪些?测试数据如下: 

    1. 故障板卡

                                                                               表1

    序号

    41点电压(V

    42点电压(V

    采样值(十六进制)

    备注

    状态

    1

    2.3077

    2.499

    1D95

     

    正常

    2

    2.3260

    2.499

    1DCA

     

  • AD9240 valid reference Voltage

    I am wondering about the valid range of the external reference Voltage that can be applied to the AD9240’s VREF .  The only limitation I could find was in the absolute maximum value section of the datasheet but I doubt that every VREF value applied…

  • AD9240 valid reference Voltage

    I am wondering about the valid range of the external reference Voltage that can be applied to the AD9240’s VREF .  The only limitation I could find was in the absolute maximum value section of the datasheet but I doubt that every VREF value applied…

  • AD9240: Maximum allowed power supply ripple

    What's the maximum ripple voltage for Analog Supply (+5V, AVDD).
    AD9240 is used in differential mode.

     

    The spec allows a tolerance of +/-5% on the supply but this only refers to DC.
    The AD9240 is a high speed 10Msps ADC and as such…
  • AD9240使用问题

            设计的原理图如下图。输入VINA(DETECTOR_VIDEO)范围(1.4V,4.4V),因此设计时输入VINB=2.9V,VREF=1.5V,这样VINA-VINB范围(-1.5V,+1.5V),即(-VREF,+VREF)。

            问题:前端输入DETECTOR_VIDEO断开时(即理论上VINA无输入),测量却发现DETECTOR_VIDEO对地电压为2.7V左右,改变VINB输入值时,DETECTOR_VIDEO对地电压也随之变化,略低于VINB输入电压值(如VINB=2.4V时,DETECTOR_VIDEO…

  • Question about AD9240 output data format

    According to the data sheet, when VINA - VINB >= REF, the ad9240 outputs 11 1111 1111 1111 1111.

    So the ad9240 just can convert voltage between 0 and REF if it works in single-ended input ?

    For example, my REF is 2.5V, and VINB is tied to GND. What…

  • AD9240: SINAD specification include effect of aperture jitter

       I\'m going to use AD9240 in my project. It would be interesting to know, do
    a SINAD parameter (in data sheet it is 75dB @ 5MHz) include an aperture jitter
    influence, and how well an aperture delay matches from part to part.

     

    The…