VIAVI ULN-1100 Ultra Low Noise 100 MHz GPS Disciplined Oscillator (GPSDO) Module

Compact 1.5 x 4.0 inch GPS disciplined oscillator module with 100 MHz and 10 MHz outputs and a -162 dBc/Hz phase noise floor.

1 PPS Accuracy: ±30 ns to UTC RMS (1-Sigma)
Frequency Accuracy: Better than ±3E-010
Long-Term Performance: Better than 5 parts per Trillion (5E-12) averaged over 24 hours
Holdover Stability: <±7 µs over 24 hour Period

Datasheet

Overview

The VIAVI ULN-1100 is a compact GPS Disciplined Oscillator (GPSDO) module measuring 1.5 x 4.0 inches. It provides several 100 MHz and 10 MHz outputs, built-in distribution amplifiers and a 50-channel GPS receiver with -160 dBm tracking sensitivity. All outputs are frequency- and phase-synchronized to UTC via GPS, giving long-term performance that VIAVI describes as Better-Than-Cesium™.

Because it supplies both a 100 MHz and a 10 MHz reference on one board, the ULN-1100 is suited to ultra-low-phase-noise up-conversion systems such as those used in radar and satellite communication equipment, including up-conversion to Ka, Ku and K bands.

The module is backwards compatible in fit and function with the FireFly-IIA GPSDO, adding performance and functionality in the same footprint. For airborne and avionics use, it can report a 3D velocity vector, attitude/tilt, speed, heading, height (MSL and GPS), position, time, date, frequency, time-stamping and health information.

The ULN-1100 provides Stratum-1 long-term performance of better than 5E-12 averaged over 24 hours. Options cover temperature range, thermal stability, g-sensitivity and shock/vibration insensitivity, including a ruggedized, extended-temperature, low-g oscillator version. For mission-critical systems, a direct redundancy feature lets multiple units be daisy-chained. Control is via SCPI-99 commands and NMEA-0183 over RS-232, supported by the GPSCon and JLTerm software utilities.

Key Features

Only 1.5 x 4.0 inches in size
Sine, CMOS and LVDS outputs
High-performance 50-channel GPS receiver with -160 dBm tracking capability
-162 dBc/Hz phase noise floor
Optimized for up-conversion to Ka/Ku/K bands
NMEA-0183 SCPI-99 plug and play
Built-in 100 MHz, 2-port distribution amplifier with Sine Wave outputs
10 MHz Sine Wave and LVDS outputs
Outputs frequency and phase-synchronized to UTC via GPS
Stratum-1 long-term performance of better than 5E-12 averaged over 24 hours
Direct redundancy feature allowing multiple units to be daisy-chained
Backwards compatible in fit and function with the FireFly-IIA GPSDO
Ruggedized, extended temp-range, low-g oscillator option
Avionics data output: 3D velocity vector, attitude/tilt, speed, heading, height, position, time and health information

Specifications

Module Specifications

1 PPS Accuracy	±30 ns to UTC RMS (1-Sigma) GPS locked
Frequency Accuracy	Better than ±3E-010 After 1 hour of operation with GPS locked
Long-Term Performance	Better than 5 parts per Trillion (5E-12) averaged over 24 hours Stratum-1
Holdover Stability	<±7 µs over 24 hour Period @+25°C (No Motion)
ADEV	1 s to 1000 s: 5 to 9E-12 With GPS lock, typical
Warm Up Time/Stabilization Time	<10 min at +25°C to 1E-09 Accuracy Typ.
TTL Alarm Output	GPS Unlock and Hardware Failure indicator

Outputs and Control

1 PPS Outputs	Three outputs: 5 V CMOS, LVDS, and RS-232 level output OCXO flywheel generated
10/100 MHz Outputs	4x LVDS 100MHz, 2x +7 dBm, 1x CMOS, 1x Sine 10 MHz, 1x LVDS 10 MHz 9 outputs total, 7 @100 MHz, 2 at 10 MHz. Web page states +13 dBm Sine Wave outputs for the 100 MHz distribution amplifier; datasheet lists +7 dBm
RS-232 Control	Full control via SCPI-99 Control Commands, NMEA-0183

GPS Receiver

GPS Frequency	L1, C/A 1574 MHz
GPS Antenna	Passive or Active, 5 V
GPS Receiver	50 Channels, Mobile, GPS, WAAS, EGNOS, MSAS supported, Galileo ready
Sensitivity, Acquisition	-144 dBm
Sensitivity, Tracking	-160 dBm
TTFF, Cold Start	<45 sec
TTFF, Warm Start	1 sec
TTFF, Hot Start	1 sec

Oscillator Specifications

Frequency Output	Both 10 MHz, and 100 MHz outputs
10/100 MHz Retrace	±2E-08 After 1 Hour
Frequency Stability	±2.5E-010 over temperature
Frequency Stability (g-sensitivity) Low G	±3E-010 per g per axis Low-g option
Output Amplitude, 100 MHz	LVDS, CMOS 5 V, +7 dBm Sine Web page states +13 dBm Sine Wave outputs; datasheet value given
Output Amplitude, 10 MHz	LVDS, +12 dBm Sine
Warm Up Time	<12 min
Designed Lifetime	>10 years

Phase Noise

Phase Noise Floor	-162 dBc/Hz
1 Hz offset, 100 MHz Out	-60 dBc/Hz
1 Hz offset, 10 MHz Out	-100 dBc/Hz
10 Hz offset, 100 MHz Out	-95 dBc/Hz
10 Hz offset, 10 MHz Out	-125 dBc/Hz
100 Hz offset, 100 MHz Out	-118 dBc/Hz
100 Hz offset, 10 MHz Out	-140 dBc/Hz
1 kHz offset, 100 MHz Out	-140 dBc/Hz
1 kHz offset, 10 MHz Out	-142 dBc/Hz
10 kHz offset, 100 MHz Out	-155 dBc/Hz
10 kHz offset, 10 MHz Out	-145 dBc/Hz
100 kHz offset, 100 MHz Out	-160 dBc/Hz
100 kHz offset, 10 MHz Out	-145 dBc/Hz

Power

Supply Voltage (Vdd)	11.0 V to 16.0 V DC Nominal
Power Consumption	< 4 W at +25°C with DOCXO

Environmental

Operating Temperature	-25°C to +75°C (+85°C extended temp range option)
Storage Temperature	-45°C to +85°C
Environmental Conformance	MIL-STD-202, Method 204, Condition I-A

Physical

Size	1.5 x 4.0 inches

Specifications are taken from the manufacturer's documentation. See the datasheet for complete and current values.

Applications

Ultra-low-phase-noise up-conversion systems
Radar equipment
Satellite communication equipment
Airborne and avionics systems
Mission-critical redundant timing systems
Defense
5G communications
SATCOM
Transportation
Data center
Energy
Financial
Critical infrastructure

Options & Accessories

Option	Description
22174848	ULN 1100 100MHz SOCXO Standard Temp - RoHS — SOCXO, standard temperature range
22174846	ULN 1100 100MHz DOCXO Standard Temp - RoHS — DOCXO, standard temperature range
22174847	ULN 1100 100MHz DOCXO Extended Temp - RoHS — DOCXO, extended temperature range
22174849	ULN 1100 100MHz DOCXO Extended Temp Low G - RoHS — DOCXO, extended temperature range, low-g
22174853	ULN 1100 100MHz DOCXO Low G Ultra Extended Temp - RoHS — DOCXO, low-g, ultra extended temperature range