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ADS1198一致性问题

Other Parts Discussed in Thread: ADS1198

用ADS1198做12导联ECG采集,将TESTN,TESTP引出进一步放大提取起搏脉冲,现在的问题是,TESTN,TESTP放大后的噪声有些芯片噪声大有些芯片噪声小(同一片PCB,外围电路全部一样,测试条件也一样,不同的仅仅是ADS1198),这是不是ADS1198芯片一致性不好,还是市面上有仿冒品出现。(噪声主要是8KHz斩波器干扰)。