• AD7684共模误差的事

    我用AD7684搭建了一款AD转换电路,我把输入(IN+和IN-)短路,共同连接到参考电源上(4V),读出来的数据为0x533而不是"0",再把输入短路后,重新共同连接到Ref/2的偏置电压上,读出来的值约为0x34,也就是说共模误差抑制好差,这是什么原因?我想AD7684原厂样品不会有问题吧,可是我也看不出电路上有什么问题,所以来请大家指教!谢谢!

  • AD7684: Stuck bits

    result b0 and b3 are always "0"

    I have 2 cards with that bug.

    Have you an idea or solution !?

     

    The majority of "peculiar problems" that we see with SAR ADCs (e.g. "stuck"
    bits among the LSBs, non…
  • AD7684 issue (strange behavior)

    Hi,

    We are trying to modify the input stage of an already manufactured board by replacing AD7793 by AD7684 in order to measure up to 1KHz signals. I have attached a simplified schema of our input stage and two waveforms we have obtained from the AD7684…

  • CMRR of AD7683 and AD7684

    The AD7683 is pseudo differential input and AD7864 is true differential input.
    It is known that the pseudo differential input structure features less CMRR
    than true differential input structure. However, in the datasheet, the CMRR
    spec…
  • AD7684数据读取问题

    AD7684按手册操作,DCLOCK经过5个下降沿之后,DOUT开始传输数据,但是MCU检测到DOUT一直为低电平,请问有没有遇见相同问题的,下面是驱动程序

    uint16_t read_ad7684(void)

    {

        uint8_t i;

        uint16_t dat=0;

        AD7684_CLK_H;

        AD7684_CS_H;

        delay_us(100);

        AD7684_CS_L;

        delay_us(100);

        for(i=0;i<6;i++)

        {

            

  • AD7684 Pre-Processing-Best Methods Approach

    Hi,

    I have a couple of questions on this part, and the best way to pre-process the incoming signal.

    I have a low frequency AC sensor that is single ended and requires AC coupling. With the present circuit, I'm using an ADA4096 (due to it's excellent…

  • nasty midscale error with AD7684, 16-Bit, PulSAR® ADC

    Hi everybody,

    I'm evaluating AD7684 ADC with true differential input at

    5V supply and an external precision voltage reference of 4.096V.

    It is piggy back mounted to an existing board of a running

    series, firmware is adapted to its needs. Resolution…

  • AD7684读取后转换成电压的问题。

    按照这幅图,差分输入端的最大相差VREF/2的电压。

    是不是应该最后把读取的AD值换算成电压值的公式应该是===》 AD/2^16*VREF/2才对?

    我读出来的AD值和我用示波器读出来的电压值相差一半。我用的公式是AD/2^16*VREF;

    究竟是哪个正确呢?AD/2^16*VREF ?AD/2^16*VREF/2?

    如果是AD/2^16*VREF 正确的话,那又是哪出问题了呢?

    求解答下。谢谢!

  • ADC with really "True differential input"

    Hi collegues.

    I need ADC with really differential input and single supply.

    -IN connected to reference point (REF/2)

    +IN connected to input signal (+\- 2.5v)

    I tried AD7684 but DataSheet tells that +IN and -IN MUST be in opposite phase to reference…

  • RE: Doubt regarding 1) -ve voltage input to AD7864 2) 12-bit Word generated by the AD7864

    Hi Janmay,

    Apologies for my delayed response.

    I am assuming that you are using the AD7684-1. From your schematic with VinxB connected to AGND,the AD7684-1 is configure to have a +/-10V Range input voltage range.

    1. On your first question that you are…