中文摘要：

根据广域电磁仪系统分频段发送和接收包含多个频率的伪随机电磁信号，以及接收机采集电磁信号时要求高频段高速采样，低频段高精度低速采样的特点，选择了符合接收机采集特性的高性能、高速度24位模数转换器AD7762，简要介绍了AD7762的特性，设计了基于AD7762的广域电磁采集器，并从硬件、软件方面给出了实现方案．实验结果表明，AD7762在广域电磁接收机应用中取得了良好的性能指标．

英文摘要：

The wide-field electromagnetism system transmits and receives the pseudo-random electromagnetic signals at several frequencies on frequency-division sections. It needs high-speed sampling at high-band, and low-speed higher-precision sampling at low-band when the receivers collect electromagnetic signals. Based on that, a 24-bit analog-to-digital converter AD7762 with high performance and high speed is used. The characteristic of AD7762 is briefly introduced, the wide field electromagnetic collector is designed based on the AD7762 and the implementation scheme is given from the software and hardware. The result shows that AD7762 achieves a good performance index in application of the wide-field electromagnetic receiver.