The HD CSAC LP GPSDO provides highly stable timing with oscillator aging under 0.3 ppb per month in holdover and zero aging when GPS‑locked. Its CSAC maintains frequency stability better than ±0.5E‑09 from 0°C to 75°C without GPS disciplining. The module 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 is 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 below 2E‑12 at 10,000 seconds. Outputs include LVDS and 3.3 V CMOS 1 PPS signals.

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