The CPLL66-4240-4240 from Crystek Corporation is a Frequency Synthesizer with Frequency 4.24 GHz, Step Size 2500 KHz, Output Power 3 to 6 dBm, Harmonics -15 to -10 dBc, Supply Voltage 3.3 to 5 V. Tags: Surface Mount, VCO + PLL Frequency Synthesizer. More details for CPLL66-4240-4240 can be seen below.