We designed the Audio Board with BF522C Processor, when testing the Audio Input, without any input also we are getting the some signal level.
The signal level is between -8 to +11 (Signed 16-bit mode).
The Interface between the Audio Codec and Blackfin SPORT is I2S Mode.
When input is connected to GND, also same result (Shorting the R66 and R63).
Is these is common for for BF522C Audio Codec?. If not what is the input signal Noise Level when Input shorted to GND?.
The Input interface section is OK?.
Is required any modifications to reduce the Noise level?.
I attached the Schematics related to Audio Input Section of the Board.