It uses the Xilinx Company Spartan-3E series of XC3S250ETQG144 processor based on FPGA to A/D conversion chip TLC549 driven sampling and later actual voltage value of reading. By use of Verilog language, the whole module design is under the environment of ISE with less complex logic, compact modular design,high speed A/D conversion and sequential control. The portability is strong. And then, we use ISE compile, synthesize and simulation,for the follow-up A/D conversion work provises experimental basis. Experimental results show that the design reliability is high, which can satisfy the A/D conversion of high precision, real-time, anti-jamming requirements.