Hope , you can help with an answer.

here is misterious CODEC is showned. How can I make it right. Datasheet is here!

 

If you do not know what it means do not buy this IC.
CODEC can be any device that accepts PDM signal at his input.
http://www.analog.com/media/en/technical-documentation/data-sheets/SSM2537.pdf
http://www.st.com/web/en/resource/technical/document/application_note/DM00040808.pdf