在信号处理过程中，自然界的模拟信号首先要经过A/D转换器（ADC）变换成数字信号，送到DSP中。文章设计了一种高精度的转换序列发生器，能分别单独处理8位数据，并行后能处理16位数据。这意味着ADC每收到一个启动转换请求，模块可以自动执行多次转换。对于每一次转换，可以通过模拟多路开关选择16个可用输入通道中的任何一个。转换结束后，所选通道的转换结果被保存在相应的结果寄存器中。也可以对同一个通道采样多次，允许用户使用“过采样”，其较传统的单次采样转换结果提供了更高的精度。该设计为高精度DSP的设计提供了良好的技术基础。%The natural analog signal may turn to digital signal by AD convertor first, and then transport to the DSP, in the process of signal manages. This paper design a high precision conversion sequence generation. It can deal with 8 bits data respectively and 16 bits data in parallel. It means that:ADC received every conversion request;the module will conduct several conversions automatically. Each of conversion, we can choice every input channel through the 16 analog MUX. After the conversion, the results are saved in result-registers. We also can sample several times in a channel. Let consumer use pass-sample, which supplied more precision than traditional single conversion. This work supplies a good technologic base for high precision DSP design.
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