This part is a kind of semiconductor called AR9223.

Function of this product has Single-Chip 2x2 MIMO MAC/BB/Radio.

Manufacturers : Atheros

Image and pinout :

Some of the text within the PDF file :

Data Sheet October 2009 AR9223 Single-Chip 2x2 MIMO MAC/BB/Radio with PCI Interface for 802.11n 2.4 GHz WLANs General Description The Atheros AR9223 is a highly integrated single-chip solution for 2.4 GHz 802.11n-ready wireless local area networks (WLANs) that enables high-performance 2x2 MIMO configurations for wireless station applications demanding robust link quality and maximum throughput and range. The AR9223 integrates a multi-protocol MAC, baseband processor, analog-to-digital and digital-to-analog (ADC/ DAC) converters, 2x2 MIMO radio transceiver, and PCI interface in an all-CMOS device for low power and small form factor applications. The AR9223 implements half-duplex OFDM, CCK, and DSSS baseband processing, supporting up to 130 Mbps for 20 MHz and 300 Mbps for 40 MHz channel op [ ... ]

AR9223 PDF Datasheet Download