The Si4122-D-GM from Skyworks Solutions is a Frequency Synthesizer with Frequency 900 to 1800 MHz / 750 to 1500 MHz, Output Power -14 to 1 dBm, Harmonics -26 to -20 dBc, Supply Voltage 2.7 to 3.6 V, Current 18 to 27 mA. Tags: Surface Mount. More details for Si4122-D-GM can be seen below.