• Slew rate VS input level (ad8641?)

    Hi,

    I'm pretty new to analog electronic. I've been learning from appnotes and datasheets, and i've sometime seen reference of slew rate VS input level.

    I've understood the effect of slew rate in audio, and i'm sure it's a really important…

  • RE: 签个到，送您好礼啦！（获奖名单已公布）

    湘潭，雨湖，我做开关电源，我关注AD8641

  • RE: REF02: TEMP pin

    Hi Mr. K,

    I just want to clarify that bias current is the amount of current that the input circuitry of op amp requires for its proper operation. If the bias current of AD8641 is 260pA(max), then it is also the maximum current that the AD8641 can be…

  • RE: AD8066用哪个芯片可以替换

    非常感谢你的帮助！我已经选择了AD8641，具体效果要看实际应用了。

  • RE: AD8627是五脚单运放，使用温度只有80度，有没有温度是125度的

    封装也要和AD8627相同吗？可以看一下AD8641.

    如果没有封装限制的话，还可以看一下ADA4000-1，ADA4627-1，AD8510。

  • RE: Low input bias current. Which one to choose?

    Some of the other choices are:

    ADA4610-2 if you need a dual

    AD820, AD822

    AD8641, AD8642

    AD8610, AD8620

    AD8510, and ADA4610-2

    All of these are stable at gain of 1 for your voltage follower

  • Noise Calculation in MS-2022

    Hi 

    how to get the below value from AD8641? from datasheet, In should be 0.5fA, right?

    another question is about 

    in calculation, BW is equal to 10Kz. but in application MT-049, BW = 1.57*FCL,  FCL = GBW / NoiseGain, this is my understanding,

    so please…

  • RE: Boosting AD8642 output current

    Thank you for the answer. I'll try and implement that circuit and analyze the results. And yes, the output connected to ground was a mistake I made when I modified the schematics to post it here.

    My design uses the other op amp present in the AD8642…

  • RE: Transimpedance Amplifier (Photodiode interface)

    FormerMember
    FormerMember

    Rookie,

      When I do a sim on the power supply, you have no attenuation with R20 and C20 until you get past

    15 kHz.  Try increasing R20 to 100 ohms and C20 to 10 uF.  Would also help to put a small ceramic

    (0.001-0.01uF) across C20.

    The AD8541 is CMOS…

  • RE: 印象•ADI放大器——有奖互动，说出你的ADI放大器印象

    年初做微弱信号放大项目时考虑过OP选型问题。当时涉及到：

    首先对于微弱信号处理，得选择低偏置电流，输入阻抗大的OP。ADI最好的用于光电转换上的芯片是AD549L（Ib=60fA），根据项目的需求，对于uA级的信号，理论上OP的偏置电流至少要nA级别，最好是pA级别。这种OP ADI有很多种，FET输入级基本都在这个级别：如AD8627，AD8641等等。最终选择了AD8627。

    此外，注意使用过程中的降噪处理，比如反馈电阻上加反馈电容（很有必要），可降低电路的高频噪声增益。第二种方法是用复合放大器进行降噪处理…