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ADC084S101采集数值有误差

Other Parts Discussed in Thread: ADC084S101, OPA4348

ADC084S101采集的数值总是有误差,感觉像是与运放阻抗匹配不匹配,这方面不是太懂

现在电路AD前端运放为opa4348做跟随,运放后端一个低通r=500ohm,c=560p;

如果每通道采样率200Kbps采样的话(每个通道间连续采样1Mbps):

单通道采集的数值都偏小,

两个通道接到可能有一个通道数值偏小

三个通道接到一起总有一个通道数值偏小,

四个通道接到一起采集到的数值正确;

如何解决?