The APL1690-R/T from ASB Inc. is a Frequency Synthesizer with Frequency 1.69 GHz, Step Size 1000 KHz, Reference Frequency 13 MHz, Output Power 3 to 7 dBm, Harmonics -25 to -20 dBc. Tags: Surface Mount, PLL Frequency Synthesizer. More details for APL1690-R/T can be seen below.