• RE: AD7780 non-ratiometric usage

    Hi Kevin,

    The input range is defined by Vref. So, with a 2.5V reference, the input range is +/-2.5V/gain which equals +/-19.5 mV. If you are using an absolute reference, a low-noise reference such as the ADR381/ADR391 should be used.

    Regards,

    John…

  • RE: about the noise density of voltage reference IC.

    Hello LucaV,

    Thank you for your reply.

    I understood that the voltage noise density is flat at higher frequencies.

    I'd like to know the  noise density of ADR361 and ADR381.

    Do you have the chart as same as ADR391's?.

    Regards,
    Kou

  • AD7193 Supply Voltage & Reference

    SCHEMATIC1 _ PAGE1.pdf

    Hello,

    Please find attached figure.

    I have used REFIN2 by setting REFSEL=1.

    As shown in fig. 3.3V supply is connected to AVDD & REFIN1 is tied to AVDD. Fig. shows Inductor L is connected in series. Instead of L if I Connect Resistor…

  • Where can I find the user guide for the ADN2871/ADN2873 evaluation boards?

    Where can I find the user guide for the ADN2871/ADN2873 evaluation boards?

     

    Please refer to the attached ADN2871/ADN2873 evaluation board application note.
  • [高精度数据采集][AD7799][电子称称重]

    AD7799称重系统
      

       AD7799的方案定型,到PCB样板的打样就只有几天的时间,可以说很顺利。简单的说一下模拟部分的电路:传感器信号经简单的一阶RC低通滤波直接接到AD7799AIN1+AIN1-AD7799DOUTSCLKDINCSADuM1401跟单片机相连,单片机本身带有SPI口,但本人觉得设置SPI积存器比较麻烦,就采用模拟SPIAD7799进行通讯;系统采用2个电源模块分别对模拟电路和数字电路进行供电,粗略的算了一下模拟电路部分的功耗,采用LM2931对模拟部分供电…

  • AD7795 calibration

    We are using AD7795 in a product. Factory sys cal takes place at 60mV on
    appropriate range. We now have a requirement to also add a lower range. Is
    there a way of calculating the cal register values for the lower range from the
    existing sys cal…

  • 工业应用Sigma-Delta ADC常见问题解答

    问题:峰峰值噪声与有效噪声的区别,峰峰值分辨率与有效分辨率的区别?无失码分辨率又是指的什么?

    答案:无失码分辨率是对ADC线性性能的评价指标。峰峰值分辨率和有效值分辨率是评价ADC噪声性能的重要指标。它们之间的关系是

    峰峰值分辨率=有效分辨率-2.7 bits

    这个关系的理论基础是,噪声通常是随机的,并且它的分布是正态分布。那么

    Vnoise (peak-to-peak) = Vnoise (rms) x 6.6;99.9%的出现概率

    如果转换为分辨率,就是2.7位的差别。(log26…

  • Sigma -Delta ADC常见问题解答

    Sigma -Delta ADC常见问题解答 by ADIForum

    ADI 拥有一系列种类齐全的高分辨率低带宽的Sigma-Delta ADC 产品,这些产品不仅集成了ADC,还集成了电流源、多路开关、可编程增益放大器PGA,模拟输入缓冲等等。

    附件中是 Sigma -Delta ADC常见问题解答 ,欢迎小伙伴们下载~~

    2772.attachment.pdf

    RE: Sigma -Delta ADC常见问题解答 by ADIForum:

    针对该资料中的问题【为什么转换结果的后几位总在跳…

  • Sigma -Delta ADC常见问题解答

    ADI 拥有一系列种类齐全的高分辨率低带宽的Sigma-Delta ADC 产品,这些产品不仅集成了ADC,还集成了电流源、多路开关、可编程增益放大器PGA,模拟输入缓冲等等。

    附件中是 Sigma -Delta ADC常见问题解答 ,欢迎小伙伴们下载~~

  • RE: Offset/full scale register

    Hi,

    The offset register is set to 800000 hex by default. The full scale error at a gain of 1 is calibrated in the factory so this register will contain some default value also (5XXXXX hex).

    Further calibrations can be performed. So, as part of the…