OCXO Specification Part No. + Packaging: LFOCXO065760Bulk Description A GPS disciplined OCXO incorporating a GPS receiver unit to give 1PPS and 10MHz output. With 1.5s holdover stability achieved by using an adaptive algorithm. Standard NMEA0183 data is available to the user via a serial port. Model IQCM-110 Model Issue number 1 Working States (Reference Drawing): Run1: Fast track. Adjust the OCXO 10MHz output frequency quickly to track the GPS. Run2: Slow track. Adjust the OCXO 10MHz output frequency slowly when phase error is in the defined range. Holdover: No GPS input present an algorithm enables adaptive modelling of the frequency stability of an OCXO with reference to the GPS timing signal. Free Run: Clock module powered up with no GPS input. NMEA Data Words: The following standard GNSS data is available to the user via the interface on pin 6 and pin 7: GPRMC, GPVTG, GPGGA, Outline (mm) GPGSA, GPGSV, GPGLL, GPZDA. These are broadcast every second in sync with the 1PPS output. Note 1: The IQCM-110 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 two days operation with good GPS signal, however this data will be lost at power down. Note 3: When State Input (Pin 8) is set low the IQCM-110 will operate in Holdover mode regardless of the 1PPS signal condition. Frequency Parameters Frequency 10.0MHz Operating Temperature Range -20.00 to 75.00C 10MHz RF Output Details, Pin 2: HCMOS Compatible Workflow Diagram (Sinewave 50 option available) 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): 1E-12 Short Term Stability (tested after power for 1hr ref to 25C, 1s, using PN9000 test equipment): 2E-11 max Ageing (Vs and temperature constant, reference to T=25C, Vs = 5.0V and after 30 days operation): 0.2ppb per day, 10ppb per year 1PPS Output from internal GPS receiver, Pin 10, Phase Accuracy when locked to GPS: Initial Lock Status (<30mins locked to GPS): 200ns max Full Lock (>30mins locked to GPS): 80ns max Steady Lock State (>24hrs GPS lock): 25ns RMS max 24hrs Holdover Capability: Reference 7 days powered on, 2 days GPS lock. Temperature varied <1C/min within operating temperature range. Total Temperature Change Holdover Capability T<2C 1.5s Note: Other options available on request. Sales Office Contact Details: UK: +44 (0)1460 270200 France: 0800 901 383 Email: info iqdfrequencyproducts.com Germany: 0800 1808 443 USA: +1.760.318.2824 Web: www.iqdfrequencyproducts.com Printed on 14 Mar 17 11:18 using Part Data Sheet V1.00014 Page 1 of 3OCXO Specification Part No. + Packaging: LFOCXO065760Bulk Electrical Parameters 5.0V 5% Supply Voltage 1PPS output from internal GPS receiver, Pin 10: Waveform: HCMOS Test Condition: 15pF ViH: 2.7V min ViL: 0.4V max Pulse Width: 100ms min State Input, Pin 8 (<5mA load): Lock: 2.7V min Unlock: 0.4V max Pin 8 has an internal pull-up cct. Power Supply Details, Pin 12: Supply Voltage: 5.0V 5% Current Consumption: 2A during warm up, 1A steady state 25C AC Ripple: 50mV pk-pk max, 10Hz to 1MHz GPS Internal Receiver Specification: Type: GPS Position Lock Number of Channels: 50 Frequency Band: L1 (1575.42MHz) Tracking Code: C/A Code Tracking Capability: 12 Satellites Sensitivity: Tracking and Navigation 162dBm Reacquisition -157dBm Cold Start (autonomous) -148dBm Antenna Input SMA-KE (active antenna recommended) Output Details HCMOS Output Compatability 1PPS Reference Output, Pin 3 (15pF test condition): Waveform: HCMOS VoH: 2.7V min VoL: 0.4V max Pulse Width: 100ms min Lock Status Indicator, Pin 5: Module Locked: 2.7V min Module Holdover: 0.4V max Module Locked means Working State is = Run2 Current: 5mA max Serial Interface (Pin 6 and Pin 7): NMEA-0183 VoL and ViL: 0.4V max VoH and ViH: 2.7V min Baud rate: 9600 Bits: 8 Parity: N Stop Bit: 1 Noise Parameters Phase Noise on 10MHz RF Output Signal (dBm/Hz): Offset Typical Max 10Hz -118 -113 100Hz -138 -133 1kHz -148 -143 10kHz -150 -145 100kHz -150 -145 1MHz -150 -150 Sales Office Contact Details: UK: +44 (0)1460 270200 France: 0800 901 383 Email: info iqdfrequencyproducts.com Germany: 0800 1808 443 USA: +1.760.318.2824 Web: www.iqdfrequencyproducts.com Printed on 14 Mar 17 11:18 using Part Data Sheet V1.00014 Page 2 of 3