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Audio codec AIC3106 and performance

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rakeshm55:
Hi all,
 I wanted to use TLV320AIC3106 in one of our design. So procured an evaluation board of the same.
http://www.ti.com/tool/TLV320AIC3106EVM-K

I will be attaching a coil mic to it. On testing the mic i could acquire Vpp in the range of 2mV to 10mV.

I was trying to capture audio samples using AIC3106evm. I fed to mic input using audio analyzer(600Ohms,1Khz tone,sine ).
I acquired samples (sound recorder in Windows 7) using PC in .wav format.

following were my configurations for codec to capture input
MIC3R input on audio codec (LADC)
Level (attenuation set to 0db)
PGA set to 0db

and fed following range (3mV to 500mV) 1kHz tones.

On analyzing the captured input ....I can receive 50mV (wave shape maintained) ..... below 50mV inputs waveshape looks unrecognizable ....
Applying 500mV gives a clear swing, for lower voltages (below 50mV) no much negative swing seen....

I tried applying  PGA of 20dB to lower voltages 3mV to 50mV here to lower voltages though receive higher amplitude has no tone content for voltages below 50mV.

I am unable to identify what is the issue. Is this noise inherent at chip input?? is it board induced noise overcoming weak input signals.??
I later modified the input with low pass filter of 4kHz bandwidth but of no use.

Does it mean I need to amplify the signal before sending to codec??


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