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DAC82002: 关于手册给出的0.1Hz~10Hz噪声指标

Zhenrong Liu
Prodigy 40 points
Part Number: DAC82002


R2R无缓冲DAC的输出噪声密度，理论上就是输出电阻的热噪声密度，按照输出电阻6.25k计算，噪声密度为10.14nV/√Hz，这与手册给出的指标相符，按照这个噪声密度计算0.1Hz~10Hz的噪声电压，结果会得到31.46nVrms，按照6.6倍标准差计算峰峰值为207nVpp，达到手册指标的2倍，为何理论计算结果会超出手册指标如此之多？