097-10603-01 Rev. A – November 2004 X72 Desiger’s Reference and User’s Guide 29
Design Integration Considerations
Mechanical Considerations
Integrating the X72 into a System
Symmetricom has developed several integration options to aid the system designer
in integrating the X72 into their application. These options provide a variety of
connection schemes. Each option is described below.
Unpopulated Edge Board
The Unpopulated Edge Board is a small printed circuit board (PCB) that plugs
directly into the X72’s Molex connector.
The Unpopulated Edge Board includes unpopulated pads for the following
components:
16-pin header (See pin out comparison in Appendix A, X72 J1 Connector and
Plug)
Coaxial connector for the Sine Output
Resistor and Capacitor pads to allow for improved Sine Output dc filtering (See
Electrical Interface, on page 36)
From the various interface points on the Edge Board a system designer can access
all inputs and outputs of the X72 and can mount the connectors that are necessary
for their application. This provides a variety of connection schemes. The examples
included in this document are just a few of the integration methods possible with
these edge boards.
The Edge Board comes in three different versions: Unpopulated (PN 106568-001),
Standard (PN 106569-003), and Anchored (PN 106569-002). The three versions
are electrically identical. The Anchored version is 3.5 inches (8.89 cm) long. The
Standard and Unpopulated versions are 1.74 inches (4.42 cm) long. Each card has
two anchor points (refer to Figure 2-2, Figure 2-3, and Figure 2-5). In addition, the
standard edge board includes the header that is mounted directly to the PCB by
direct solder connection or by plugging into a socket provided by the user.
Refer to Figure A-3 in Appendix A, X72 J1 Connector and Plug for a schematic of
the connector pinouts.
Figure 2-2 Unpopulated Edge Board
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