文件名：ADC0809.vhd功能：基于VHDL语言，实现对ADC0809简单控制说明：ADC0809没有内部时钟，需外接10KHz~1290Hz的时钟号，这里由FPGA的系统时钟（50MHz）经256分频得到clk1（195KHz）作为ADC0809转换工作时钟。-File name: ADC0809.vhd features: Based on the VHDL language, easy to control implementation of the ADC0809 Descr iption: ADC0809 internal clock does not need external 10KHz ~ 1290Hz clock number, here by the FPGA system clock (50MHz) frequency by 256 points to be clk1 (195KHz ) as the conversion ADC0809 clock job.