Linear Technology DC1649A Demo Manual page 4

DEMO MANUAL DC1649A
QUICK START PROCEDURE
Table 1. PLLWizard Installation File
FILE
PLLWizardSetup.exe
PLLWizardSetup_net20.exe
n
Choose PLLWizardSetup if you have .NET 2.0 or later,
have Windows Vista or Windows 7, or if you have less
than .NET 2.0 but want the latest .NET installed.
n
Choose PLLWizardSetup_net20 if you have less than
.NET 2.0, and want faster installation (no additional
Microsoft downloads are needed, but the file size is
much larger).
The setup file will verify and/or install Microsoft .NET and
install PLLWizard. Refer to the Help menu for software
operation.
Figure 3. PLLWizard Screenshot
4
Arrow.com. Arrow.com. Arrow.com. Arrow.com.
Downloaded from Downloaded from Downloaded from Downloaded from
.NET 2.0 SOURCE
latest version downloaded from
Microsoft
2.0 SP2 included (much larger file size)
DC1649A Configuration
1. Connect an appropriate reference frequency source (at
J2) and signal analyzers (at J6 and/or J7) using the
SMA connectors (see Figure 1 and the Typical DC1649A
Requirements and Characteristics table).
2. Choose the MUTE jumper setting: JP1 - GND/3.3V MUTE
position. Select GND to mute the RF output, 3.3V to
un-mute.
3. Connect the GND, 3.3V, and 5V banana jacks and the
"V+VCO" turret to a power supply and apply power (see
Figure 1 and the Typical DC1649A Requirements and
Characteristics table).
4. Connect the DC590 to the DC1649A with the provided
ribbon cable.
5. Run the PLLWizard application.
6. In PLLWizard, click File → Load Settings and point to the
"DC1649A-10MHz.pllset" or "DC1649A-100MHz.pllset"
file found in the PLLWizard installation directory (typically
Program Files → LTC → PLLWizard → Set Files).
The red LED on DC1649A should turn on indicating that
the loop is locked at 914MHz.
Troubleshooting
If the red LED does not illuminate, follow the instructions
below:
1. Verify that you are able to communicate with the
DC1649A. The bottom status line in PLLWizard should
read "LTC6945" and "Comm Enabled". Refer to PLL-
Wizard's Troubleshoot and Help if not.
2. Verify that the 3.3V, 5V and "V+VCO" have the correct
voltages on them and that the reference frequency is
applied to the REF+ SMA input.
If the red LED is on but you cannot detect an RF out-
put, make sure jumper JP1 is at the 3.3V position. Run
Help → Troubleshoot in PLLWizard if the problem is not
resolved.
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