HD CSAC LP GPSDO Low Power 10 MHz CSAC GPS Disciplined Oscillator

Low power 10 MHz CSAC GPS disciplined oscillator module that runs from a single +5 V supply and draws <0.45 W in holdover.

Long-Term Oscillator Aging: Less than 0.3 ppb per month in holdover without GPS; Zero aging with GPS
Frequency Stability Over Temperature: Better than ±0.5E-09
1 PPS Accuracy: ±15 ns to UTC RMS (1-Sigma)
Frequency Accuracy: Better than ±2E-010

Datasheet

Overview

The HD CSAC Low Power (LP) 10 MHz GPSDO is derived from the HD CSAC GPSDO. It keeps the feature set of the HD CSAC GPSDO and adds further operating capabilities and features.

The HD CSAC LP uses a different system design that cuts power consumption by more than 60%. It operates from a single +5 V supply and consumes as little as 0.42 W (typical) in external 1 PPS locking or holdover mode with the GPS disabled. With GPS enabled, power consumption is less than 0.55 W.

Beyond the features carried over from the HD CSAC GPSDO, the low power version adds a 3.3 V CMOS 1 PPS output, a socketed CSAC so the chip-scale atomic clock oscillator can be upgraded easily, a second TTL-level serial port that operates independently of the RS-232 serial port, and a low-power holdover mode that switches off the supply to the GPS receiver when GPS reception is not needed.

Key Features

<0.45 W power consumption in holdover
Compatible with the HD CSAC GPSDO
Single +5 V supply
3.3 V CMOS 1 PPS output
Socketed CSAC for easy upgrading of the CSAC oscillator
Independent TTL and RS-232 serial ports
Low-power holdover mode that shuts off power to the GPS receiver
Ultra low power 10 MHz reference with holdover

Specifications

Frequency and Timing

Long-Term Oscillator Aging	Less than 0.3 ppb per month in holdover without GPS; Zero aging with GPS
Frequency Stability Over Temperature	Better than ±0.5E-09 CSAC only, no GPS Disciplining, 0°C to +75°C
1 PPS Accuracy	±15 ns to UTC RMS (1-Sigma) GPS Locked in Position Hold mode
Frequency Accuracy	Better than ±2E-010 After 3 minutes operation with GPS lock
Holdover Drift	<±2.5 µs drift per hour After 5-minute warmup with GPS lock; over worst case temperature range
Typical Holdover Drift	<±1 µs drift per hour After 5-minute warmup with GPS lock; at 25°C ±5°C
Warm Up Time/Stabilization Time Without GPS	<130 s at +25°C to <5E-010 accuracy typical
g-sensitivity	<0.2 ppb per-g per-axis
Magnetic Sensitivity	Less than 0.4 ppb per Gauss

ADEV (with GPS lock)

1 s	<1E-10
10 s	<2.5E-11
100 s	<2E-11
1K s	<1E-11
10K s	<2E-12

Phase Noise

10 Hz	-75 dBc/Hz
100 Hz	-115 dBc/Hz
1 kHz	-128 dBc/Hz
10 kHz	-134 dBc/Hz
100 kHz	-140 dBc/Hz

Outputs and Interfaces

1 PPS Output (CSAC Flywheel Generated)	LVDS output, 3.3 V CMOS output
10 MHz Outputs	10 MHz LVDS, 10 MHz CMOS 3.3 V
RS-232 and TTL serial ports	Independent RS-232 and TTL ports, 9.6 K, 19.2 K, 38.4 K, 57.6 K, 115.2 K
RS-232 and TTL NMEA Output Sentences	NMEA 0183 rev. 2.3, Sentences: GGA, RMC, ZDA, PASHR, and others
External GPS option	1 PPS input for optional external SAASM GPS receiver
TTL Alarm Output	Hardware Event Indicator
Connectors	CSAC oscillator socketed for easy upgrade

GPS Receiver

GPS Frequency, Antenna	L1 C/A 1574 MHz, Passive or Active Antenna 3.3 V, MMCX Connector
GPS Receiver	50 Channels, Mobile, SBAS: WAAS, EGNOS, MSAS supported
Sensitivity, Acquisition	-147 dBm
Sensitivity, Tracking	-160 dBm
Time To First Fix, Cold Start	<30 sec
Time To First Fix, Warm Start	1 sec
Time To First Fix, Hot Start	1 sec
Motion Adaptive Filter Settings (dynamic mode enabled)	Optimized depending on vehicle velocity (Auto-sensing, Auto-switching)

Power

Supply Voltage (Vdd)	+5 V ±5%
Power Consumption	<0.45 W holdover or external 1 PPS mode, <0.55 W with GPS enabled Web page states as little as 0.42 W (typical) in external 1 PPS locking or holdover mode with GPS disabled

Environmental and Reliability

Operating Temperature	-10°C to +70°C
Storage Temperature	-45°C to +85°C
MTBF	>100,000 Hours

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

Applications

UTC holdover clock for dismounted radios
Ultra low power 10 MHz reference with holdover
Blue-Force communications equipment such as jammers/spoofers
UTC timing for telecom applications
DAB/DVB digital audio/video broadcast stations
VSB terrestrial TV station transmitter synchronization and syntonization
Power generation facilities requiring long battery-powered holdover
Avionics retrofit with 10 MHz/1PPS clock
Cell towers and base stations for 5G synchronization
Train and mobile equipment synchronization
High altitude balloons
UAS/UAV timing and frequency synchronization
Underwater oil exploration and underwater beacons

Options & Accessories

Option	Description
22174905	CSAC HD Ultra Low Power SA.65 5V OEM Board w/socket CC - RoHS
22174906	CSAC HD Ultra Low Power SA.65 UFL OEM Board w/socket CC - RoHS
1005157-CC	CSAC HD Ultra Low Power SA.65 UFL OEM Board w/socket CC - non-RoHS
1005115	CSAC HD Ultra Low Power OEM Board w/socket - non-RoHS