097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide 19
Description
Typical Applications
Typical Applications
The elevated operating temperature range of the X72 sets a new high-point for this
type of atomic reference. Compared with traditional quartz oscillators, the stability of
the X72 allows it to maintain excellent frequency control even when the operating
temperature goes above 85° C. Even if the host system overheats in fault mode the
X72 oscillator continues to produce a stable and accurate time or frequency
reference.
The X72 is easily integrated into time and frequency systems because of its low
profile. The height and footprint are designed to accommodate 0.8 inch (4 I) wide
card slot applications. The unit operates with a low power requirement (between
+10 and 32 Vdc).
This design is being successfully applied as an OEM component in wireless
telecom networks such as digital cellular/PCS base stations, SONET/ SDH digital
network timing, etc. Linked with a GPS receiver or other external timing reference,
the X72 provides the necessary timing requirements for CDMA cellular and PCS
systems. The low temperature coefficient and excellent frequency stability extend
holdover performance when the GPS signal is not available. Temperature
compensated units are available for those special applications requiring even better
temperature performance.
The X72's 20-year stability without the need for retuning permits extended operating
periods without maintenance (long life Rb lamp, extended crystal control range).
The design produces a stable frequency with good short and long term stability, and
excellent spur performance.
The microprocessor-based X72 is a more cost-effective system design that allows
serial command selection and enabling of TTL-level digital output frequencies. This
allows the oscillator output to be divided to a number of different frequencies, as
opposed to older oscillators with a single fixed output frequency. The sine output
frequency is selected at time of order.
A 1 PPS output is an integral part of the design. An optional 1 PPS input allows the
unit to track a GPS or other external reference, and display the difference between
the input and the 1 PPS generated by the X72 through the RS232 link.
Note: Symmetricom's commitment to quality and reliability is backed
by a 20-year warranty on the physics package (lamp bulb and
resonator cell).
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