• AD621: PSRR

    Q

    We have an AD621 measuring the voltage drop across a 2.5R sense resistor.
    We are measuring 78uV of noise at the output of the AD621 with x10 gain. I have
    taken the inputs 2,3 out of circuit and directly shorted them. The noise is
    still there.
    The data…

  • AD621 data sheet Rev.B,  SOIC Package (dimension height) error

    There is a discrepancy data sheet error as reference below, which are not
    aligned. can you advise which package is correct.

    discrepancy

    (a) In wwww.analog.com. Under the AD621 product page for AD621ARZ, under the
    section "Price…
  • Using AD621 with single supply + Load Cell + adc

    Hello,

    I am fairly inexperienced with load cells + instrumentation amplifiers. I'm looking to create the following circuit so that my load cell signal is amplified into a proper range for my ADC using a single supply. This is very similar to the situations…

  • RE: AD621 drift with temperature

    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
  • AD621的输入电压电流噪声询问

    你好,我们最近的设计采用了AD621将传感器的差分信号转为单端信号。由于被测信号微弱,我们需要评估运放噪声对测量信噪比的影响。在查阅AD621,REV.B的数据手册时候,有两个问题很困惑。

    1. 说明书 page 6 中TPC 6. Voltage Noise Spectral Density在增益10 和增益100的时候,其电压噪声转折频率是多少?另外按照page11的Figure 4. Make vs. Buy中离散模型计算,不明白运放的增益为什么等于100。按照图中标示的电阻计算,增益只有1…

  • 关于交流小信号放大电路,OP270和AD621搭建,但是输出一直不对

    电路如图,输入的是不到1mv的10khz交流,经过两级放大了49*52倍,输出得不到理想结果,

    输入是在一个2mΩ的精密电阻上取样,电阻动一下,输出就会有变化。

    这个电路在同样幅值100Hz的电路里可以正常工作,输出也正确。

    滤波LC改到0.1uf、200Ω试过也不对,去掉C201/C202也不对。

    请指教。

  • AD621 spice model

    Hi AD,

    AD621 spice model seems to be not available in models library.

    Could you tell me which amplifier spice model could be used instead of AD621 amplifier please ?

    Thx

  • RE: 仪表放大器AD620、621数据手册应用示例中U-I转换器问题

    AD621短路电流最大18mA,不能满足最大50mA的设计电流。

    即使输出电流在18mA范围之内,也要考虑AD621的功率,毕竟电流输出和调节是由AD621完成的,AD621承载了全部的电源调节功率。

    这个电路适合小电流、低电压恒流源设计。

    结论:不满足0-10V转0-50mA的电流源设计

  • INAMP questions

    Q1.Could you suggest us an ADI variant for the following application: We need
    an Very High Temperature stability Pin Programmable Instrumentation amplifier
    with gains x1 (input signals  /-12.5V min), x10 and x100. It is very important,
    when overrange…