数模混合信号前端的系统分割考虑ADI

简介：

问：请问模数转换中，转换精度与地信号有没有决定性的关系，如有，怎样处理？
答： It"s has very important influence on resolution. therefore you need to make sure grounding is very proper (you can refer to the answer to same questin previously); also you can use some devices like instrument which can help you reject grounding noise

问：如何验证或仿真分割的正确性和有效性?
答： There are four ways. The effection and whether it is correct should be based on the time to market, performance and cost. Four ways are suitable, but you should choose the better one.

问：ADI公司有无模拟通道隔离的AD？有没有免费样品？
答： ADI has the ADC that has more than one ADCs in it. For the free samples, please go to www.analog.com to get it.

问：模数转换模拟输入如何解决负载电容的问题？
答： If necessary, please add an extra amplifier before the ADC.

问：系统分割如何把速度考虑在内?
答： One of the benefits of smart partitioning with MxFE"s is that they are designed to keep interface speeds low.  For example, interpolation filters are designed into MxFEs and can be used to reduce the digital data interface rate while keeping

问：专家你好！
我正在使用AD73360进行六路信号的采集工作，发现我的程序进行16点数据采集还没有问题，进行128点的时候就不行了。采样速率我已经设置为最大值，还是不行。所以我想问一下，进行128点六路同时采集有没有什么需要特别注意的地方？麻烦你给我讲一讲。谢谢了。   
答： AD73360 can run 64 kS/s Maximum Sample Rate. If you really need high speed, then you need use SAR ADC such as AD766x.

问：如何解决前放的漂移和失调？
答： Where the parts will be used? What"s the bandwidth? You can use chopper amplifiers, AD8551, AD8571 for example. Another way is to calibrate it in your system software.

问：ADI公司有无关于模拟和数字分割的仿真系统可以用来设计?
答： No, no company will provide that to you. Maybe you can use VHDL to implement it. But we are not sure whether this is accurate enough.

问：模拟电路少不了基准电压源,如何减少对它的干扰?
答： Please make sure no big noise signal like digital signal pass its routing. Other thing need take care includes grounding, power supply de-coupling, and sometimes even shielding.

问：在芯片上模拟的电流源要经过数字部分，这在版图上要注意些什么？
答： Basically it"s not permitted for analog power supply to pass digital circuit. If it can"t be avoided, then please try to seperate its routine from digital section by some area cutting.