GPS Disciplined Oscillators (GPSDO's)
Maintain accuracy and synchronization, even through GPS outages
GPSDO’s provide time and frequency reference signals that have the same long-term accuracy as the GPS signal itself, and also provide a “holdover” capability to maintain synchronization when GPS outages occur. Symmetricom offers a full line of these board-level products, which are an ideal choice when full instrument functionality isn’t required. For the many systems that require an embedded GPSDO, these proven modules reduce design cycle time and risk compared to developing a custom solution.
Like the GPS-1000, the GPS-2000 is a 10 MHz OCXO-based GPSDO with a small footprint and firmware enhancements aimed at avionics applications. However, the GPS-2000 goes further, adding additional telemetry features and a daisy- chain redundancy capability for mission- critical applications. The GPS-2000 also has a built-in high-isolation distribution amplifier, enabling it to provide five 10 MHz outputs.
The GPS-2500 and GPS-2550 are 10 MHz Double-Oven OCXO-based GPSDO’s. The GPS-2500 covers a temperature range of 0°C to +75°C, while the GPS-2550 covers an extended range of -25°C to +75°C. These units have all the firmware capabilities and high- isolation outputs of the GPS-2000, while offering improved holdover performance, thanks to their double-oven reference oscillator.
The GPS-2600 and GPS-2650 are 100 MHz Double-Oven OCXO-based GPSDO’s. The GPS-2600 covers a temperature range of -25°C to +75°C, while the GPS-2650 covers an extended range of -25°C to +85°C. Aimed at radar applications requiring a high-stability, low-phase noise reference, these units have all the firmware capabilities of the GPS-2000. The built-in distribution amplifier provides two 10 MHz outputs, seven 100 MHz outputs, and three 1 PPS outputs, all with high isolation. The double-oven reference oscillator allows for excellent holdover performance.
When the ultimate in performance is required, choose the GPS-2700 or GPS-2750, which use Symmetricom’s Quantum™ SA.45s Chip Scale Atomic Clock (CSAC) as their reference oscillator. These units provide unparalled holdover, ultra-low power consumption, fast warm-up time, industry-leading 1 PPS accuracy, and a low profile, all in a small footprint. Both units provide a 10 MHz output, and the GPS-2700 covers a temperature range of 0°C to +75°C, while the GPS-2750 covers an extended range of -40°C to +85°C.
Aimed at radar applications, the SSM-2000 and SSM-2650 both provide six 100 MHz outputs with high stability and very low phase noise. Both units are self- contained with integrated power supplies, filters, and a distribution amplifier. Both can be operated as free- running sources or disciplined by a 10 MHz or 1 PPS input. The SSM-2000 is based on a single-oven OCXO and operates from -25°C to +75°C. The SSM-2650 uses a double-oven OCXO and operates from -55°C to +80°C.