This part is a kind of semiconductor called AS6001.

Function of this product has (AS6001 / AS6002) FM Stereo Transmitter.

Manufacturers : Accel Semiconductor

Image and pinout :

Some of the text within the PDF file :

Accel Semiconductor AS6001 / AS6002 FM Stereo Transmitter FEATURES Highly integrated FM stereo transmitter  Patent-pending architecture  Low power operation, extremely suitable for portable devices  Ultra low standby current in 10uA with PDN enable  LDO embedded for easy power supply design  3-wire digital control interface for flexible channel programming and control (AS6001)  4-wire parallel control interface for easy channel programming and control (AS6002)  87 – 108 MHz with 0.1MHz step PLL-based continuous tuning for China, Europe and North America (AS6001)  87.7 – 88.9MHz and 106.7 – 107.9MHz with 0.2MHz step PLL-based continuous tuning (AS6002)  Less off chip components  Small footprint SSOP-20 and QFN-20 package  GENERAL DESCRIPTION [ ... ]

AS6001 PDF Datasheet Download