基于FPGA的高速A/D转换芯片ADC08D1000应用

Application of High Speed A/D Converter ADC08D1000 Baesd on FPGA

提出用超高速A/D转换芯片ADC08D1000作为系统前端采样电路的方法,以解决工程中严重系统性能的采样速率和采样精度问题。详细介绍ADC08D1000的原理与功能,用VHDL语言编写普通模式和扩展模式下的控制程序。针对工程中的实际情况进行优化设计,用延迟初始化、自校准等方法解决了发热、周围环境变化对芯片的影响等问题。该程序结构清晰,参数修改方便,具有一定的通用性。最后给出此芯片工程实践中的采样结果。ADC08D1000性能出色,能满足最高频率1 GHz以下大多数信号的采样要求,在工程实践中已经得到使用,并取得了良好的效果。

A method of applying high speed A/D converter ADC8D1000 for sampling circuits which usually lie in the front end of systems,so as to improve the rates and precision of sampling which heavily influence the system＇s whole performance. The architecture and functions of ADC08D1000 are described in details. Controlling programs in both normal and extend mode of the chip with VHDL language are presented. The programs are optimized with consideration of the change of temperature and enveriment by way of delay initialization and self calibration, and they are designed in particular so that the parameters can be modified conveniently. It can be used as a general component in other designs. At last, a result of sampling with the converter is offered. ADC8D1000 has an impressive performance,and can satisfy most of the cases needing sampling rates below 1 GHz. In engineering pratice,this design has been used and has performed well.