The MD–173 is a Vectron "Coefficient Corrected Oscillator" (CCXO) that contains a high–stability ovenized crystal oscillator and an I²C interface that communicates with temperature and current sensors, and an onboard EEPROM. The interface enables the customer to improve upon the already exceptional stability of the oscillator. Provided in a fully hermetic 28 x 38 mm package, the device is capable of aging rates of =0.06 ppb/day and uncorrected temperature stabilities of 0.4ppb from 0 to 70°C. Use of the information provided in the I²C interface provides a cost effective means of further improving temperature stability. See our application note below on Coefficient Corrected Oscillators to learn more.