This part is a kind of semiconductor called ALM-81224.

Function of this product has High Linearity 1450 - 2750 MHz Variable Gain Amplifier.

Manufacturers : AVAGO

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Some of the text within the PDF file :

ALM-81224 High Linearity 1450 – 2750 MHz Variable Gain Amplifier Data Sheet Description Avago Technologies’ ALM-81224 is a high linearity variable-gain amplifier module for use in the 1450-2750MHz band. Gain control is achieved using a single DC voltage input pin. High linearity is achieved through the use of Avago Technologies’ proprietary GaAs Enhancementmode pHEMT process1. It is housed in a miniature 6.0 x 6.0 x 1.0 mm 24-pin Molded Chip On Board (MCOB) package. Gain changes monotonically with gain control pin voltage. Input is fully matched. Output match can be tuned for optimal performance at a particular frequency band within the VGA operation frequency range using common RF board layout. The compact footprint coupled with high linearity and efficiency makes ALM-81224 an idea [ ... ]

ALM-81224 PDF Datasheet Download