ADI CN0301 通用LVDT信号调理解决方案

ADI公司的AD698是完整的单片线性可变差动变压器(LVDT)信号调理子系统, 结合LVDT使用，能够以较高精度和可重复性将传感器机械位置转换为单极性或双极性直流电压.工作频率20Hz到20kHz,单极或双极输出,线性度0.05%,输出电压611V,可以用于线性位移测量.本文介绍了AD698产品亮点和主要特性,几种典型应用电路以及CN0301通用LVDT信号调理电路,材料清单和PCB元件布局图.

The AD698 is a complete, monolithic Linear Variable Differential Transformer (LVDT) signal conditioning subsystem. It is used in conjunction with LVDTs to convert transducer mechanical position to a unipolar or bipolar dc voltage with a high degree of accuracy and repeatability. All circuit functions are included on the chip. With the addition of a few external passive components to set frequency and gain, the AD698 converts the raw LVDT output to a scaled dc signal. The device will operate with half-bridge LVDTs, LVDTs connected in the series opposed configuration (4-wire), and RVDTs.

The AD698 contains a low distortion sine wave oscillator to drive the LVDT primary. Two synchronous demodulation channels of the AD698 are used to detect primary and second-ary amplitude. The part divides the output of the secondary by the amplitude of the primary and multiplies by a scale factor.
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