您好,
我在使用ADC芯片ADS6445时,当输入端INA_P和INA_N管脚分别与VCM管脚间连接49.9欧姆电阻。不接输入信号。VCM设置为输出1.5V模式。通过分析DA数字接口输出的数据,发现底噪一般在-110dB,但是在130KHz,140KHz,以及240KHz附近均存在-85dB的 较大噪声。请问如何解决?
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