Design of High-Speed ADC Data Acquisition System Based on FPGA
Aiming at the requirement of large field of view and high resolution of laser scanning confocal microscope,a high-speed data acqui-sition system based on FPGA is designed in order to obtain more data in the scanning time of galvanometer.This system uses Xilinx A7 series FPGA as the main control chip,LMK0482X series clock generator provided by TI company and a single channel 14-bit high-speed ADC14X250 chip supporting JESD204B protocol to form the signal acquisition system.The system uses Verilog hardware description language to realize each module function under Vivado platform,and completes the register configuration of LMK0482X and ADC14X250 chips through SPI protocol,and constructs high-speed serial data link based on AXI protocol by using Xilinx's JESD204B IP core,realizing efficient data acquisition and transmission between ADC and FPGA.The experimental results show that the interface can receive the analytical data correctly at the transmission rate of 5 Gbps,the sampling rate of the system can reach 250 Mbps,and the data sampling accuracy is 14 bit,which meets the data acquisition requirements of laser scanning confocal imaging instruments.
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