Linear Technology DC1954A Demo Manual page 3

Quick start proceDure
Download the LTC6954_GUI setup file at:
www.linear.com/LTC6954_GUI.
Run the LTC6954_GUI setup file and follow the instructions
given on the screen. The setup file will verify and/or install
Microsoft .NET and install the LTC6954_GUI.
DC1954A Configuration
1. Connect the GND and V+ 3.15V-3.45V, turrets to a
power supply and apply power (see Figure 1 and the
Typical DC1954A Requirements and Characteristics
table).
2. Connect the DC590 to the DC1954A with the provided
ribbon cable.
3. Run the LTC6954_GUI application.
4. From the LTC6954_GUI, click File -> Load Settings
and point to the LTC6954.6954set file.
5. From the LTC6954_GUI, select the Read All button.
This will update the GUI to display the correct part
number and associated output types.
DEMO MANUAL DC1954A
6. Connect a low phase-noise (or jitter) single-ended or
differential signal to IN+ (J8) and/or IN- (J9). Refer to
the LTC6954 data sheet for acceptable input frequen-
cies and amplitudes.
7. From the LTC6954_GUI, update Fin to the frequency
of the input signal in step 6. This will update the
LTC6954_GUI with the correct output frequencies.
8. Refer to the Typical DC1954A Requirements and
Characteristics table for desired OUTxSEL level. Set
JP1, JP2 and JP3 accordingly.
9. Connect desired output (OUT0, OUT1, OUT2) to a test
instrument or other demo board to evaluate perfor-
mance. [The LVDS/CMOS outputs are DC-coupled,
please make sure the levels do not exceed the test
equipment input levels].
10. To synchronize outputs provide a 1ms or greater
high pulse to the SYNC SMA to take advantage of the
EZSync function.
Be sure to power down or terminate any unused RF output
with 50Ω, or poor spurious performance may result.
Figure 3. LTC6954_GUI Screenshot
dc1954af
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