The ASG2-D-V-A-644.53125MHZ from Abracon LLC is a VCXO with Frequency 644.53125 MHz, Frequency Stability ±50 ppm, Supply Voltage 3.3 V, Current 40 mA, Duty Cycle 45 to 55%. Tags: Surface Mount. More details for ASG2-D-V-A-644.53125MHZ can be seen below.