• RE: 求前辈,寻求一款电流放大器,输入几毫安级,输出百毫安级,100~150倍,3.6V左右供电

    没有电流放大器,你需要自己搭建一个电流放大的电路,选择静态功耗低的运放即可。

    把其中AD8422换成AD8420 ,其静态功耗电流为100uA,或者选用AD8235或者AD8236,其静态功耗电流为40uA,但是其失调电压会稍差一些!

  • RE: AD8237 Spice Model doesn't work with OrCAD

    Hi,

    For the meantime, you could try using AD8420 which is almost similar to AD8237. Both are micropower instrumentation amplifiers used for ECG applications.

  • RE: AD8421使用疑问

    你的供电是12V,推荐AD8420。如果是5V供电的话,推荐AD8237.

  • How can I convert +-5V to a 4 to 20mA loop current signal?

    Hi,

    I have an electromechanical seismometer with a +-5V voice coil signal output representing velocity, and I want to signal condition the line by converting the signal to a 4 - 20mA output. I recently experimented with the EVAL-CN0314-EB1Z circuit eval…

  • 关于AD627在4-20mA检测电路中的问题

    您好,我在查阅AD627的技术手册时,关于该技术手册中的图524-20mA的检测应用电路)我有一些问题,图中的电流环是否需要与AD627共地?

    因为我在同样是仪器放大器AD8420的应用电路资料中,发现该应用电路笔记中的图四(同样是4-20mA的检测应用电路),二者是共地的。

    那么,关于仪表放大器在4-20mA电路中的应用,到底应不应该接地呢?

    我个人理解是应该共地的,否则仪表放大器相当于在测量浮空源,将没有为偏置电流提供返回路径。

  • RE: Whats the best Inamp for high speed current sensing?

    Hello Ian,

    Yes, I agree that your choice would be sufficient enough in your application. But you may also want to consider AD8420 or AD8421. AD8420 is a wide supply range, micropower, rail to rail inAmp but the bandwidth is a little lower. AD8420's CMRR…

  • RE: Regarding the conversion of mv to volt and then convert to 4 to 20 ma

    Hi Ram,

    We actually have a reference circuit which accepts 0 to 5V input and convert it to 4-20mA output.

    Here is the link: http://www.analog.com/media/en/reference-design-documentation/reference-designs/CN0314.pdf

    For your other circuit that has 0…

  • RE: 单电源3.3V供电 仪器仪表参考端处理

    您好。请您参考AD8420和AD8237是否满足您的设计要求。

  • RE: Hi, A question about the difference between the 524 and 624

    FormerMember
    FormerMember

    Olivares2,

      There are some minor differences, but the major ones are the AD624 is wider temp and lower offset.

    Depending on what your supply voltages are, the gain you need, and the highest signal frequency,

    you could look at the AD8422, AD8237, AD8421…

  • RE: High Voltage Input Instrumentation Amplier

    Hi Terry,

    In response to your inquiry about the AD8420, it has not released yet, but if your design schedule allows it I believe it would also be a very good choice for your design. It has high input-protection, allows for single-supply operation, and…