提高DSP芯片数据采集精度的电路设计方法

Circuit Design for Higher Precision in DSP Data Acquisition

提出了一种提高数字信号处理器芯片TMS320LF2407数据采集精度的电路设计方法。该方法将同一模拟信号经两个不同的变换器引入芯片内的两个事件管理器,然后根据模拟输入信号的幅值判断由某一事件管理器触发相应的排序器,选择模拟转换通道,对模拟量进行A/D转换后输出。分析证明,该方法具有较好的精度,可满足工程要求,且硬件实现简单。

This paper presents a circuit design method for higher precision in TMS320LF2407 DSP data acquisition. With this method, one and the same analog signal is entered into the EVA and EVB through two converters of different variation rates. The CPU judges which sequence should be started according to the breadth of the input analog signal, chooses the converting channels, and then outputs the result after A/D conversion. Analysis results show that the method is accurate enough to meet the engineering requirement and capable of convenient hardware implementation.