The HD CSAC is a chip‑scale atomic clock GPSDO providing highly stable time and frequency performance. It maintains long‑term oscillator aging below 0.3 ppb per month in holdover and zero aging when GPS‑locked. Its frequency stability over temperature is better than ±0.5E‑09 from 0°C to 70°C without GPS disciplining. The unit delivers ±15 ns RMS 1 PPS accuracy in position‑hold mode and achieves frequency accuracy better than ±2E‑10 after three minutes of GPS lock. Holdover drift remains under ±2.5 µs per hour across the full temperature range and typically under ±1 µs per hour near 25°C. ADEV performance reaches below 1E‑10 at 1 second and continues to improve with longer averaging times, making it suitable for demanding timing applications.

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