• AD627 NonLinearity

    I am having issue with a 4-20 ma measurement loop

    The circuit is designed as follows, with the output connected to a 16-bit ATD (Burr Brown ADS8344). Not my selection, it is standard on the micronontroller board.

    I am attempting to inject a signal…

  • AD627 PWM CURRENT SENSE

    Hello

    I am already using the AD627 that I find fantastic for example strain gauge measurement.

    Now, my problem is to measure a current through a shunt of max 70 mV.

    It is a PWM signal, thus, the information is a pulse where frequency is stable but the…

  • AD627: Minimum Vref for single supplies.

    Hi,

    What is the minimum Vref for single supply configuration?

    The following is figure 39 from the AD627's datasheet.

    The minimum Vref curve is greater than 0V for Vin(-) <3.2V, but I can't find its exact value. Also, what happens if I force a…

  • AD627 question about the REFERENCE INPUT

    AD627 question about the REFERENCE INPUT , what is this means?

    Rin 125K

  • AD627 Common Mode Range calculator page

    Hello,

    I'm working on a weight measurement connected device.

    I use an AD627 powered at 5v in single supply (final project will be powered with 3AAA).

    The strain gauge is a full bridge (1k ohm for each resistor witch give a differential voltage…

  • AD627 supply when at lower rail exceeds 85uA maximum

    I'm using the AD627 to subract a DC bias in a very low power application.  The data sheet says 85 uA supply current maximum.  Which seems true for positive differences all the way up to the positive rail.  I'm seeing like 180uA when the difference is…

  • 仪表放大器AD627输出异常

    使用AD627对外部微弱信号进行放大,信号由信号发生器发出,设计电路如图1所示。外部输入信号的频率为400Hz±20Hz,当放大倍数为500时,输出还算正常,但也有漂移。

    但当把放大倍数调到800,1000以后,AD627的输出波形异常,开始向正电源方向偏移。图2为放大器放大倍数为500时的波形。

    图1 硬件电路图

    图2  放大倍数为500时的波形,已有偏移

  • 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。

  • 求救AD627共模电压的问题,一直搞不懂

    大家好,我把电路上传了,最近遇到一各问题,我用AD627来检测0-20没mA电流信号,电流信号是来自传感器,通过20欧的取样电阻产生差分电压进入AD627的IN-和IN+两端,AD627是用的+5V单电源,参考端REF接地0V电压,在取样电阻两端的电压大概是0V-0.5V电压,我用示波器测试取样电阻两端的电压(应该是差分电压)波形正常,但道输出就不同了,输出VOUT电压波形就出现锯齿波,与输入完全不一样,不知道是什么原因,查了很多资料,可能是取样电阻两端的共模电压太小,我查了下,在取样电阻两端的电压对地是…

  • A/C signal processing circuit

    Hello,

    I'm currenty designing A/C signal processing curcuit using AD op-amps. Could someone take a look at my circuit?

    Design requirements:

    Input signal:

    bipolar source, not connected to GND, 2Vp-p

    band: DS-10kHz,

    source impedance: 50 oh…