Research and development of ADS1271 based distributed engineering seismic acquisition unit

摘要

In order to give more support to the research and development of large geophysical prospecting equipment like seismic prospecting instrument, this paper describes a design based on ADS1271 chip. The design applies to the large-scale cable digital telemetry seismograph and the development of distributed seismic acquisition unit of high precision but low power consumption, which uses high precision A/D conversion and FPGA embedded technology as well as micro-power consumption power source technology. The acquisition unit composes of data acquisition circuit board and FPGA master control circuit board. The acquisition board circuit consists of front end conditioning circuit, amplifying circuit, single-ended signal to differential signal conversion circuit, A/D switching circuit and power switching circuit; in the meanwhile a Cyclone IV E based FPGA master control board has been designed. For software, drive programs are designed for the acquisition board (including driver AD8253 and ADS1271) to achieve the function of data acquisition and the transfer of the acquisition unit.