The ASG2-P-V-B-644.53125MHZ from Abracon LLC is a VCXO with Frequency 644.53125 MHz, Frequency Stability ±35 ppm, Supply Voltage 2.5 V, Current 65 mA, Duty Cycle 45 to 55%. Tags: Surface Mount. More details for ASG2-P-V-B-644.53125MHZ can be seen below.