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ADS131A02: 阅读数据手册时的问题

Part Number: ADS131A02
Other Parts Discussed in Thread: ADS1292

HI,TI的工程师

我打算用ADS121A02来采集0-0.3V的电压信号,测量精度为0.01mV,在阅读数据手册时有以下问题:

1、VREF输入范围需要小于(AVDD-0.5),为什么在测量时可以取AVDD=2.5V,VREF=2.442V?

2、input-referred noise和μVrms noise numbers是什么关系?

3、如果我选择①ADS131A02 + VREF=2.442V + Gain=8,能否以0.01mV的精度测量0-0.3V的信号,AD前是否必须要加放大器?

如若必须加放大器,那②OP2177(放大5倍) + 一阶RC低通滤波 + ADS131A02 + VREF=2.442V + Gain=1,能否实现?

这和③ADS1292 + VREF=2.42V + PGA=8相比,哪个测量效果更好呢?

谢谢!