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ADS1262: 芯片手册中标注的噪声性能疑问

Part Number: ADS1262

在手册的8.8节,P26页的“ Table 1. ADC1 Noise in µVRMS (µVPP)”中,列出了噪声值uVrms和uVpp,

1、举个例子,在20SPS,FIR,Gain=1这个条件下,手册给出的,uVrms = 0.393,uVpp = 2.467;按照有效值和峰值之间的换算公式:峰值*0.707=有效值,按此公式,峰峰值 / 2 * 0.707 ≠ 0.393(2.467 / 2 * 0.707 = 0.872);

2、举个例子,在14400SPS,sin5,条件下,对比Gain=1和Gain=32时的uVPP值,按照以往使用ADC的经验来看,速率越快,本身的噪声就会越大,按照手册表中给出的数据,Gain=32时的噪声竟然比Gain=1时还要低很多,是我的理解不对吗?