The DS4420 from Maxim Integrated is a RF Amplifier with Gain -35 to 25 dB, Supply Voltage 4.5 to 5.5 V, Current Consumption 1.7 to 3 mA, Operating Temperature -20 to 70 Degree C. Tags: Surface Mount, Programmable Gain Amplifier. More details for DS4420 can be seen below.