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ADS1255晶振不起振

Other Parts Discussed in Thread: ADS1255

你好

        在使用ADS1255的时候遇到一个很奇怪的问题,用ADS1255采样模拟电压,数字电源采用LP2985-3.3,模拟电源采用LP2985-5.0,参考电源采用REF3025-2.5,各个电源参数正常;晶振采用7.6M,匹配电容是18PF,数字地和模拟地采用0R电阻连接,模拟地和数字地的铺铜做了分割,数字电路同时有一个单片机在工作;电路工作起来后发现ADS1255不工作,用示波器查看发现晶振不起振,是一条大约0.8V左右的直线,偶尔会出现不确定的方波或脉冲,导致ADS1255无法调试,麻烦提供调试意见。

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