• ADA4522-2上电时序

    新选了ADA4522-2作为电压采集电路的前置缓冲器,输入Vin上增加了1Mohm的下拉电阻以保证输入悬空时运放输出为低。运放供电为±13V。

    测试时发现输入悬空时运放输出为12V左右,略低于正电源电压。此时接入输入后,运放输出正常。断开输入电源后,运放输出为0V左右,正常。即异常只出现在输入悬空状态时的上电后。

    1、保持电路不变,更换之前使用的运放,没有异常,输入悬空状态下上电后运放输出为0V左右。

    2、测量±13V电源的上电时序,发现-13V上电略早于+13V几十ms,调整-13V上电到略晚于…

  • Instability of the output signal ADA4522-2

    Hi! I'm using the ADA4522-2 as a differential op-amp. According to the tests and simulation results in LTspice, the output differential voltage is approximately 24V. If you use a different operational amplifier, for example, OP2177, this problem disappears…

  • RE: ADA4522-4 seems not work well

    Hi the ADA4522-4 has an input range of 0 to 3.5V on a 5 volt supply, which explains what you are seeing for the LTspice simulation.  Even if you keep your input range between 0 and 3.5V, peaking of the filter stages may make the output voltage between…

  • ADA4522-4 in a severe EMC environment

    I have an EMC client using chains of ADA4522 op amps. The input sweeps from 20 KHz to 300 KHz. Sometimes the outputs become slew rate limited. I am concerned the ADA4522 is susceptible to large signal triangle waveform harmonic products causing aliasing…

  • ADA4522 voltage follower config with dual supplies

    using an ADA4522 (dual pack) for a buffer/inverter setup.  so, one of theamps setup as typical volt follower, the other a inverting amp.  BOth are driven from an AD8221.

    The AD8221 is outputting a 20KHz sine biased at 2V.  Vpp on sine = 2V...

    When I sweep…

  • 关于ADA4522-2的外接电阻

    大家好!

    目前本人正采用AD8676用于积分电路。考虑到ADA4522-2的失调电压等指标更优,考虑换用该芯片。粗读ADA4522-2的datasheet之后,想请教一个问题:

    ADA4522-2的输入电阻标注为30k(差模)、100G(共模)。

    那么,对于反相积分电路的积分电阻R1(目前使用AD8676时取R1=5.1K),其阻值是否需要满足某些要求呢?例如小于XXX,或者大于YYY。

    谢谢!

  • RE: What is the Common mode voltage range of ADA4522-2 ?

    Hi Emman and Harry,

    I was currently doing the testing of the constant current source when i came across a problem which i am not able to figure out why it is happening. Please help me out. 

    Problem: 

    In a buffer circuit the input voltage is measured across…

  • RE: About ADA4522-2 scope of input signal voltage

    Hi seekyong,

    The ADA4522-2 input voltage range does not extend all the way up to V+ (5V). With +/-5V supplies, the inputs can swing from -5V to +3.5V only (1.5V below V+).

    If you want to swing all the way up to V+, you'd have to select a different device…

  • ADA4522 what happens when it is used with high input resistance?

    Datasheet of ADA4522 recommends using it with low input resistances (<200 ohm) for unity gain applications. Otherwise its output goes to one rail. ( and stays there?)

    If not there is a recommendation for using workarounds.

    One is inserting high enough…

  • ADA4522无法放大小于0.1mv的信号么?

    如题,ADA4522-2无法放大小于0.1mv的信号么?这是为什么啊