The CSAC GPSDO is the first commercial Chip Scale Atomic Clock (CSAC) available on the market. VIAVI Solutions has teamed with Microsemi to integrate its SA.45s CSAC into the CSAC GPSDO module. The CSAC GPSDO is a game-changing, disruptive technology culminating from decades of research sponsored by the U.S. Government. It is a breakthrough technology that allows a Cesium Vapor Cell Atomic Reference Oscillator to be packaged in a unit several orders of magnitudes smaller than legacy products, with more than an order of magnitude in power reduction, while out-performing many industry-standard Atomic Oscillators.

The CSAC GPSDO also includes a high-performance time-interval counter that measures the internally generated 1 PPS signal from an internal 50-channel GPS receiver or an externally supplied 1PPS reference signal with a resolution of 20 picoseconds. The CSAC oscillator is phase-locked to either of these two 1 PPS signals with better than 0.3 ns average phase accuracy typically, and typically provides better than 5E-12 stability per day in holdover.