This part is a kind of semiconductor called ADF7242.

Function of this product has Low Power IEEE 802.15.4/Proprietary GFSK/FSK Zero-IF 2.4 GHz Transceiver IC.

Manufacturers : Analog Devices

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Some of the text within the PDF file :

Low Power IEEE 802.15.4/Proprietary GFSK/FSK Zero-IF 2.4 GHz Transceiver IC ADF7242 FEATURES Frequency range (global ISM band) 2400 MHz to 2483.5 MHz Programmable data rates and modulation IEEE 802.15.4-2006-compatible (250 kbps) GFSK/FSK/GMSK/MSK modulation 50 kbps to 2000 kbps data rates Low power consumption 19 mA (typical) in receive mode 21.5 mA (typical) in transmit mode (PO = 3 dBm) 1.7 μA, 32 kHz crystal oscillator wake-up mode High sensitivity (IEEE 802.15.4-2006) −95 dBm at 250 kbps High sensitivity (0.1% BER) −96 dBm at 62.5 kbps (GFSK) −93 dBm at 500 kbps (GFSK) −90 dBm at 1 Mbps (GFSK) −87.5 dBm at 2 Mbps (GFSK) Programmable output power −20 dBm to +4.8 dBm in 2 dB steps Integrated voltage regulators 1.8 V to 3.6 V input voltage range Excellent receiver selectivit [ ... ]

ADF7242 PDF Datasheet Download