我现在学习应用ICL7135这个芯片，但是很多问题出现。于是开始看intersil的一篇笔记：<Do's and Don'ts of Appling A/D Converters> 其中最后一段看不太懂。还要麻烦各位帮忙看看。 原文：Most of the A/D converters now offered by Intersil do not require an offset adjustment. They have internal autozero circuits which typically give less than 10μV offset. Therefore, the only optional adjustment required to obtain optimum accuracy in a given application is the full scale or gain reading. With the A/D converter in a continuous mode of conversion, the following procedure is recommended: The full scale adjustment is made by setting the input voltage to precisely 1/2 LSB less than full scale or 1/2 LSB down from nominal full scale. (Note that the nominal full scale is actually never reached but is always one LSB short.) Adjust the full scale control until the converter output just barely switches from full output to one count less than full output.
我的翻译：大部分intersil生产的AD都不需要偏置电压调整。这些芯片内置的自动清零电路通常可以将偏置限制在10uV。因此，要想在工程应用中获得理想的精度，唯一要做的调整就是满量程或者增益读取。
当AD要进行连续的转换时，推荐进行以下的操作。通过精确的设置输入电压为比满量程少1/2个LSB或者比名义上的满量程少1/2个LSB。（注意名义上的满量程不可能达到，通常是少一个LSB.)调整满量程控制直到输出刚刚从满输出到比满输出少一个字。
其中的gain reading不知道什么意思。还有，这段话到底是讲什么？偏置调整跟满量程什么关系？是不是满量程输入或输出可以调零？看的一头雾水。本来感觉自己英语还挺不错，现在越来越感觉不行了。
还麻烦各位高手指点一二。 |
楼主
标题置顶
标题高亮
