• AD5686R Sample rate

    Hi, I would like to use the AD5686R (in combination with an FPGA) to generate 4 channels, each channel with an sample rate of 500KS/s.

    The SPI timing seems to suggest this is possible. At 50 MHz it takes 25 cycles (24 bits + 1 for the SYNC pulse) to send…

  • RE: Reference input AD5686R

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  • RE: AD5686R/AD5685R/AD5684R transfer function error?

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  • AD5686R operation with GAIN=2

    Hi,

    Request your help to understand why the gain error is improving with Gain=2 compared to Gain=1?

    Also with Vref=2.5V & Gain=2, what should be the minimum VDD requirement to get output of 3V?

    I have seen Vref+1.5 as the minimum power supply required…

  • RE: How to program AD5686R Evaluation Board SPI using arduino mega 2560?

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  • 关于AD5686R的VDD电压与最大输出电压的关系

    我的配置是gain=2,寄存器内写入的值是FFFF,参考电压用的是内部2.5V。datasheet上说当gain=2时,VDD的范围是Vref+1.5到5.5,也就是说,我现在参考电压是2.5V,gain=2,只要VDD在4V到5.5V之间,最大输出就应该在5V,但是当我给VDD的电压是4.66V时,其写入值为FFFF时,电压却也是4.66V,虽然会有偏差,但是这偏的有点多了吧,麻烦能给我解释一下吗,这个偏差也是容许的吗?谢谢!

  • AD5686R的输出有误差

    按照给的例程改的程序。

    有一块板子上有两个DA芯片,都多少有点问题。

    其中一个芯片,如,给A通道输出0.3V,B输出0.6V,C输出1V。

    在实际测试中,偶尔会出现B输出1V,C也输出1V的情况。一般出现之后,复位一到两次,就正常了。

    第二个芯片的主要问题是这样的,如给A通道0.1V,B通道0.3V,C通道0.808V。

    AB通道都正常,但是C通道输出偶尔会为0.819V。

    C通道不是所有的电压都会出错。比如C输出0.6225,再改变为0.6224,最后变为0.6227,不断循环输出这三个电压…

  • 关于AD5686R电源问题

            我使用了AD5686R芯片作为4路AD输出,,结果发现这块电路会导致我系统的3.3V电压升至3.6V,经分析,应该是这个片子的问题。

            我的电路如下,将Vlogic设计为3.3V,将电源供电VDD与增益GAIN设计为5V,这与参考设计不同,官方给出的参考电路图为Vlogic也是5V,请问我这样设计有什么问题么,谢谢!

  • CONNECTION ERROR: AD5686R Evaluation Board was not detected

    SDP board(EVAL-SDP-CS1Z) is detected by both software and the led on SDP board blinks. But error AD5686R Evaluation Board(EVAL-AD5686RSDZ) was not detected appears after that.

    Tired 2 software;

     

    1. AD5684R Evaluation Software( CD came with EVAL-AD5686RSDZ…

  • Is it ok to put capacitors on the AD5686R reference output?

    The AD5686R has a very nice internal reference that I want to use as a reference throughout my board. This includes a SAR ADC which recommends a 1µF ceramic on its Ref input, to absorb the fast transients created during conversion. However, I don't know…