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AIC3254 静默检测

Other Parts Discussed in Thread: TLV320AIC3254

我现在在用AIC3254做静默检测:

参考TLV320AIC3254 Application Reference Guide Reference Guide 第二章2 TLV320AIC3254 Application 的 2.3.2.3 AGC节(19页第5小点)并Table 2-6

我已做以下工作:

1:把MICPGA(麦克输入放大)设为0dB(Page 1 / Register 59);

2:AGC Noise Threshold is -30dB(Page 0 / Register 87);

3:把输入接地;

4:读出寄存器值(Page 0 / Register 45:)仍不是静默状态(读寄存器不会错,已用同样方式正确读出其它寄存器值)

即现在的结果是把输入放大设为最小,把AGC Noise Threshold 设为-30dB,把输入接地,但读出寄存器仍不是静默状态,接地后输入有20mv左右噪声,这个应该电源噪声,属于正常情况的,请指教此状况该如何处理?