Principle and Application of AD698 LVDT Signal Conditioning Circuit

feifei

Principle and Application of AD698 LVDT Signal Conditioning Circuit [Copy link]

Abstract: This paper introduces the AD698 linear displacement differential transformer (LVDT) dedicated signal conditioning circuit . The application of AD698 can simplify the circuit design . The working principle of AD698 is given and its typical applications are introduced.

Keywords: Linear displacement differential transformer Signal conditioning Sensor

vampirei

Where are the things????

cooltank

Due to the impedance mismatch of the inductive sensor, the sensor is connected to the AD698 through an impedance matching circuit. Now there are several problems: 1. When the sensor is lifted away from the center position, the excitation signal (the effective value of the excitation signal is 3.4V) changes by 10mv. Will this affect the output of the AD698, such as the stability performance, and how to improve it? 2. Now we know that the effective value of the center tap of the sensor is greater than 100mv when it is at the maximum range position, and the output (DC) range of the AD698 should be 0-2.5V. Now it is required to stabilize within 0.5mv (no more than 0.5mv in about 5 minutes). Can the AD698 achieve this? I can't achieve it with my circuit now. Please give me some advice. 3. It is found that the center tap is at 0Ve

cooltank

I found that the stability performance here is worse than that in other places. What is the reason? Fourth, is there a more practical way to test the stability performance of AD698 without connecting the sensor? Now I can't rule out the problem of AD698, impedance matching, or sensor (I think the possibility of sensor problem is small. I have replaced two sensors and this situation still occurs)

在学习的路上

https://bbs.eeworld.com.cn/forum ... 636&highlight=AD698, put the things here