The ADA-4543 from Broadcom is a RF Amplifier with Frequency 2.5 GHz, Gain 13.5 to 16.5 dB, Gain Flatness 0.4 to 1.5 dB, Noise Figure 3.7 dB, Output Power 1.9 to 2.5 dBm. Tags: Surface Mount, Gain Block, Power Amplifier. More details for ADA-4543 can be seen below.