LFOCXO081528Bulk

OCXO Specification IQCM-112 ISSUE 1; March 2020 Description A disciplined OCXO incorporating a GNSS receiver unit to give 1PPS and 10MHz output. Compatible with GPS, GLONASS, BEIDOU and GALILEO. Holdover stability up to 1.5µs over 24hrs is achieved using an adaptive algorithm. Standard NMEA0183 data is available to the user via a serial port. Frequency stability better than 1ppt. Working States (Workflow Diagram): Run1: Fast track. Adjust the OCXO 10MHz output frequency quickly to track the GNSS. Run2: Slow track. Adjust the OCXO 10MHz output frequency slowly when phase error is in the defined range. Holdover: No GNSS input present; an algorithm enables adaptive modelling of the frequency stability of an OCXO with reference to the GNSS timing signal. Free Run: Clock module powered up with no GNSS input. NMEA Data Words: GNSS data is available to the user via the interface on Pin 6 and Pin 7. These are broadcast every second in sync with the 1PPS output. Note 1: The IQCM-112 should be left powered and running for 7 days minimum before operation to allow for the OCXO's internal drift to stabilise. Note 2: The adaptive module algorithm can be built after 3 days operation with good GNSS signal, however this data will be lost at power down. Note 3: When State Input (Pin 8) is set low the IQCM-112 will operate in Holdover mode regardless of the 1PPS signal condition. Outline (mm) Frequency Parameters 10.0MHz Frequency 10MHz RF Output Details, Pin 2: HCMOS Compatible VoH: 2.7V min VoL: 0.4V max Rise and Fall Time: 8ns max Duty Cycle: 45/55% max Accuracy (24-hour averaging when locked to 1PPS): ±1ppt Short Term Stability (tested after power for 1hr ref to 25°C, 1s, using PN9000 test equipment): 0.02ppb. Ageing (Vs and temperature constant, reference to T=25°C, Vs = 5.0V and after 30 days operation): ±0.2ppb per day, ±10ppb per year 1PPS Output from internal GNSS receiver, Pin 10, Phase Accuracy when locked to GNSS: Initial Lock Status (30mins locked to GNSSS): ±80ns max Steady Lock State (>24hrs GNSS lock): 25ns RMS max 24hrs Holdover Capability: Reference 7 days powered on, 3 days GNSS lock. Temperature varied