Realtek ALC269 audio codec datasheet in PDF form, 1.25 MB; the extra (1) in the name only marks a duplicate copy.

Datasheet for the RN-42 Bluetooth module, document version 2.32r, originally from Roving Networks and later Microchip.

Realtek ALC272 datasheet in PDF form, 1.28 MB. The ALC272 is a High Definition Audio codec found on many laptops, providing headphone, speaker and microphone interfaces.

Datasheet for the Microchip ENC28J60, a stand-alone 10Base-T Ethernet controller with an SPI interface, as a 480 KB PDF.