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ADS6142: ADS6142温度过高后（大约高于50度）后输出有噪声

jeno.zhang
Expert 1785 points
Part Number: ADS6142

问题描述：

          热成像仪测试芯片温度升高50度后，输入为0，输出有噪声， 干扰严重，输出波形如附件图片。温度降低后，输出噪声消失，输出波形特别干净。麻烦帮忙分析下。

 PCB说明：

          电路板的模拟地和数字地没有单点接地，两个地共用，原理图及部分PCB图片见附件， 对于PCB layout  有没有好的建议，也可以提供下。谢谢！

 ADS6142_原理图.pdf