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ADC芯片LTC2180和LTC2271供电电源跟着采样频率变化的问题

1601756581@qq.com
on Nov 14, 2019

ADI工程师:

您好，

    最近我们设计了一款用ARITIX-7为处理器，LTC2180（后面改为LTC2271也是同样的问题）为ADC的采集电路。发现给ADC的电压会采样频率的相同的约300mv的纹波，采样频率为12.5M时纹波频率为12.5M，采样频率为6.125M时纹波频率也为6.125M。

    开始推测是ADC采样是快速变化的电流导致电压不稳，并把原先给ADC供电的LDO（ADM7150-1.8）拆除，采用外部稳压电源供电，结果稳压电源上也出现300mv左右的纹波。该纹波严重影响了测量精度。

    请大神帮忙分析分析，谢谢