说明：  首先介绍一种新型的多通道高分辨率AD7656型模，数转换器的功能和性能，详细描述它在并行接口模式下的工作方式和原理。然后介绍AD7656在信号采集系统中的应用，给出设计方案和 电路。
(First of all, introduce a new type of multi-channel high-resolution AD7656型模, a number of converter function and performance, a detailed description of it in parallel interface mode of the working methods and principles. AD7656 and then introduce in the signal acquisition system is given and circuit design.)