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The TLV320AIC3110EVM-U can't work to record

Other Parts Discussed in Thread: TLV320AIC3110EVM-U

The TLV320AIC3110EVM-U can't work to record. I connect the evm board to PC for win7 with usb and the microphone is plug into the J2 MicIn. The control software has been launched and recognize the device as well the record driver for win7 of the usb-miniEVM is enabled.But it seems that no audio sinal from the microphone is captured except the white noise by the recorder  software as well the mic volume monitor has no changs when I make a sound. It seems that the AGC monitor has signal but no reaction to usb-miniEVM driver. Is there any problem with usb-minEVM driver for win7?