The APL1288-R from ASB Inc. is a Frequency Synthesizer with Frequency 1.288 GHz, Step Size 1000 KHz, Reference Frequency 56 MHz, Output Power 2 to 6 dBm, Harmonics -25 to -20 dBc. Tags: Surface Mount, PLL Frequency Synthesizer. More details for APL1288-R can be seen below.