This part is a kind of semiconductor called RF2506.

Function of this product has VHF/UHF VCO/HIGH-ISOLATION BUFFER AMPLIFIER.

Manufacturers : RF Micro Devices

Image and pinout :

Some of the text within the PDF file :

Preliminary RF2506 VHF/UHF VCO/HIGH-ISOLATION BUFFER AMPLIFIER 12 Typical Applications • Low Voltage • Wireless LANs • IF LO for 2.45GHz ISM Band Systems • Wireless Local Loop • Digital Cordless Phones Product Description The RF2506 is an integrated oscillator and buffer amplifier chain designed to achieve low sensitivity to fluctuations in load impedance and power supply noise, while maintaining superior phase noise performance. The IC offers great flexibility, yet is easy to use. This product was designed for use in applications with low supply voltages. It has a power-down feature and is designed to operate from 10MHz to 1000MHz with the help of an external resonator. Frequency control is achieved with an external varactor diode. The IC’s ease of use, reduced load pullin [ ... ]

RF2506 PDF Datasheet Download