来看看 PCM1798和PCM1794的区别（下文来自国外谋专栏）：As far as I can determine, the real difference between these two converters comes down to output current and digital filter performance. Its so easy to get caught up in specsmanship and forget that circuits frequently dont deliver in practice. I have a PCM 1798 to work a design up with, but I keep wondering if the additional stop band performance and available output current of the 1794 would provide a cleaner simpler design. I think the 1798 might require a two-pole reconstruction filter to keep the quantization noise of the DS modulator reasonable, where the 1794 may not need any post filtering to reach the same performance. Has anyone implemented these converters with a passive or discrete I/V into a gain stage sans output filter and taken some measurements? Does the filter in the 1794 really provide the extra performance worth paying the difference in cost, or is it just another datasheet fairy tale?
发表于 2020-10-1 11:30
楼主
