Microsemi SA.45s, User Manual

SA.45s Chip-Scale Atomic Clock

SA.45s CSAC User Guide Revision D

31

1PPS Output (SMA)—The 1PPS output is buffered by a CMOS 0 V–3.3 V logic gate on the evaluation 
board.

3.5.3

Installing the CSAC on the Test Fixture

ESD Caution: To avoid electrostatic discharge (ESD) damage, proper ESD handling procedures must be 
observed in unpacking, assembling, and testing the CSAC.

Remove the CSAC and evaluation board from their ESD protective bags only in an ESD-safe environment.

Note: The SA.45s pinout is keyed (see 

) so the CSAC can only be inserted in the 

Table 2 (see page 5)

proper orientation. Gently insert the CSAC into the socket on the evaluation board.

3.5.4

Cabling

Connect the provided RS-232 cable between the evaluation board and the COM port on the PC. On 
laptops without an available COM port, a USB-to-RS232 adapter, such as National Instruments USB-232, 
can be used.

Make sure the power switch is OFF on the evaluation board, as shown in 

. 

Figure 13 (see page 30)

Connect the 5 V power adapter between the 5 V power input and a wall outlet. (Check labeling on 
included power supply to ensure compliance with local utility ratings.)

CSAC signal outputs are available from the evaluation board on connectors J3 (RF) and J5 (1PPS). 
Connect either (or both) of these to your test equipment (frequency counter, spectrum analyzer, and so 
on).

3.5.5

CSACdemo Software Installation

The Microsemi CSACdemo software (part number 084-00365-000) provides a convenient graphical user 
interface for monitoring and controlling the SA.45s CSAC. CSACdemo also is used for collecting and 
archiving monitor data from the CSAC. It can be installed and run on any PC running Microsoft Windows 
XP, Windows 7, or Windows 10 and having at least one available RS232 (COM) port.

Note: Multiple CSACs can be monitored from a single PC, provided additional COM ports are available.

The software installation is available for download from the Microsemi website.

Upon accepting all of the default installation options (recommended), the CSACdemo software is 
installed in 

, a startup icon is added to the 

c:\Program Files\Microsemi\CSAC

Start > All > Programs > 

, and a CSACdemo icon is placed on the desktop.

Microsemi > CSAC menu

3.5.6

CSACdemo Operation

The following sections outline how to operate the CSACdemo software.

3.5.6.1

Initial Power-On

Connect power and RS232 to the evaluation board as described in 

. Turn on the 

Cabling (see page 31)

power switch on the evaluation board. Double-click the CSACdemo icon on the connected PC.

3.5.6.2

Establishing Communications

When communications are successfully established, the CSACdemo main window appears as shown in 
the following screen shot.