The circuit,which has high accuracy,multi-channel and strong real-time operational performance,and takes ARM kernel S3C2440 as its processor,and 24-bit ADS1256 chip with the analog switch as its A/D conversion and signal input channel,was designed for a seismic data acquisition system. The bridge low-pass filtering input of data effectively inhibits the common mode signal through long wire and greatly improves the ability of the whole circuit resistance against electromagnetic in-terference,by which the characteristics of high precision,high quality,low consumption and portability were realized for the seismic data acquisition system.%介绍了以ARM内核S3C2440为处理器，24位自带模拟开关的ADS1256芯片为A/D转换和信号输入通道选择，利用其特性、工作原理来设计具有高精度、多通道、实时操作性强的地震数据采集系统电路。数据通过桥式低通滤波输入，有效地抑制了长导线共模信号，并且大大提高了整个电路抗电磁干扰能力，从而可以实现地震数据采集系统的高精度、高质量、低功耗和便携式等特点。
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