Embedded GPS Time and Frequency Module

This GPS synchronized time and frequency module, the GPS-TFM, is a new solution for many applications such as video

This GPS synchronized time and frequency module, the GPS-TFM, is a new solution for many applications such as video synchronization, cellular frequency references, E911 Time of Arrival position determination systems, telecom synchronization systems, network quality of service measurement systems, and other applications requiring precise time and frequency. The module is a versatile core product that can be custom tailored to meet specific OEM requirements. Modules can be supplied delivering a broad range of reference frequencies and timing outputs. This module is specifically designed for OEM applications that require a precise source of time and frequency with a simple interface, small size and low cost. Field upgrades can be quickly programmed by sending data through the RS-232 port to the module's flash memory. Integration into host systems is simplified by a single +12VDC power input.

The evaluation module acquires precise time and frequency from atomic clocks aboard Global Positioning Systems (GPS) satellites with 40 nanosecond time accuracy and 1 X10-12 frequency accuracy referenced to the world's international time standard, Universal Coordinated Time (UTC). During satellite tracking there is no long-term frequency drift. The time module delivers time over an RS-232 serial bus and utilizes the bus to accept a time comparison programming value. This value, with a resolution of one millisecond, triggers an output pulse when the UTC time equals this time value. The programmable time comparison pulse and a one Pulse Per Second (PPS) output signal are the high accuracy time outputs. In addition, the module features a 10Mhz frequency reference which is cycle-locked to the one PPS output signal.

TrueTime Inc., 2835 Duke Court, Santa Rosa, CA 95407. Tel: 707-528-1230; Fax: 707-527-6640.