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PCMD3180: 192K采样下,BD滤波器没反应

Part Number: PCMD3180

您好:
       我们系统使用前4个通道,如下图所示,在96K采样下,配置BIQUAD_CFG[1:0] = 2'b10,然后配置具体BD寄存器,滤波效果明显;
       在192K采样下,配置BIQUAD_CFG[1:0] = 2'b01,然后配置具体BD寄存器,信号没有变化,感觉滤波器没有起作用,为什么,能解答下吗,谢谢。