Rubidium Oscillators IQD Rubidium Oscillators operate at a standard frequency of 10MHz with a supply voltage as low as 3.3V, depending on the model. The ICPT-1 rubidium clock is designed using the coherent population trap (CPT) method. It features a small size (36mm x 45mm x 14.5mm) and a low 0.5A current consumption. The ICPT-1 uses a laser to induce quantum transitions, which increases the life expectancy of the atomic clock. Users can connect an external 1PPS input or take the internal clock for a 1PPS output for synchronization in various applications. The IQRB-1 sub-miniature atomic clock comes in a 50.8mm x 50.8mm x 25mm through-hole package. It has 100 times less drift than OCXO, ±0.05ppb, and short-term stability of 0.008ppb/s at 100s as well as long-term stability. The IQRB-1 provides phase noise of -67dBc/Hz at 1Hz and -140dBc/Hz at 1kHz. It offers sine wave output compatibility and a Mean Time Between Failure (MTBF) of approximately 100,000 hours.