IQCM-112 OCXO Specification
■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 1 ppt.
■Working States (Workflow Diagram):
▲Run 1: Fast track. Adjust the OCXO 10M Hz output frequency quickly to track the GNSS.
▲Run2: Slow track. Adjust the OCXO 10MHz output frequency slowly Mien phase error is in the defined range.
▲Holdover: No GNSS in put 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 in terface 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 OCXOs 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.
●Frequency Parameter:
■Frequency:10.0MHz
■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): ±1 ppt
▲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 GNSS): ±200ns max
▲Full Lock (>30mins locked to GNSSS): ±80ns max ▲Steady Lock State (>24hrsGNSS lock): 25ns RMS max
■24hrs Holdover Capability:
▲Reference 7 days powered on, 3 days GNSS lock
▲Temperature varied <1°C/min within operating temperature range.
▲Total Temperature Change Holdover Capability
△T＜±2°C ±1 5μS
■Note: Other options available on request, please contact our Application Support department.
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Please see the document for details |
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3 Jul 20 |
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