如何正确选择数模转换器ADI

简介：

问：请推荐几种用于通讯的转换器芯片。谢谢。
答： In whihc kind of wireless system?
For 3G, we have AD6644/5, AD6623/4, AD6634/6, AD6650/2, AD9777, AD9786 and so on.

For details, contact 800 810 1742, please.

问：请问，要达到高精度，对 reference voltage 要求一定很高吗？
答： The voltage reference"s accuracy influence the accuracy of the part. So for high performance DAC, it needs high performance reference.

问：DA的一个参数:MSPS UPDATE RATE是什么意思,是不是最高的工作频率?
答： MSPS is million samples per second
Update rate is MSPS for many converters,e xcept the Sigma-Delta ones. They are not maximum working frquency, they are the frequency that converter can work normally. The maximum should be faster than them.

问：现有的D/A转换器转换速率最快能达到多快？
答： For ADI, the fastest is 500MSPS. They are AD9782/4/6.

问：dac 的精度于速度有什么关系
答： There is no direct relationship between accuracy and speed of a DAC.

Current output DACs are much faster settling in ns in contrast to voltage output dacs, settling in ms.  
Both types are available with 16 bits of accuracy.

问：现在高速DAC数据输入主要采用什么样的传输模式及通讯协议,对数据传输方面有什么特殊的要求或在设计方面应该特别留意的地方.
答： Now the interface between microcontroller and DAC is mainly TTL/CMOS level, but later there will be LVDS interface. What you should take care is the layout, grounding and decoupling.

问：请专家谈谈影响D/A转换精度因素和相应采取的措施
答： The factors are internal and external.
Internally architecture, fab process, and design all contribute to accuracy. Accuracy may also be improved by trimming [laser or other means] or calibration. Low offset output amplifiers are necessary.
Externa

问：DAC芯片选择时其转换速度与精度如何权衡才能得到最便宜的芯片？谢谢
答： The simplest way for you is to give ADI a call, we can select one for you. Our contact way is 800 810 1742.

问：选择转换器时,在EMC方面应注意哪些问题.
答： A lot of EMC compatibilty is based on system design and not just component selection.

PCB Grounding, Layout and decoupling of power supplies have a big effect on Succeptability and Emissions. System shielding also has a big impact on this. There a

问：有什么型号的DAC，是四通道的，12位并行的，转换速度不低于500K?
答： you can refer to our AD5340/1