We're using the integrated audio codec in TSC2100 for our development.
Mic and speaker are functiong. The voice from mic is fed to speaker.
The
voice is audible, however a persistent buzzing/noise can be heard from
the
background.

If headset is not connected to mic input, there is no buzz. However,
once
you connect the mic, a loud buzzing sound is heard.

Could this be a hardware problem (not properly grounded, etc)? How can
we
properly configure the driver to lessen the noise?

Thanks.