Quick Start Procedure - Linear Technology DC2226A Demo Manual

DEMO MANUAL DC2226

QUICK START PROCEDURE

1) Install PScope™ from
tions/PScope. This step will also install the USB
drivers required to communicate with the DC2226A
demo system. Quit PScope after the installation is
finished. Note that PScope does not directly support
the DC2226A demo system, however the Matlab and
Python scripts can export data files that may be opened
in PScope for analysis.
2) Install LinearLabTools from
solutions/linearlabtools, following the procedure for ei-
ther Matlab or Python. Both Matlab and Python code for
DC2226A are included in the \matlab\DemoBoardEx-
amples\LTC2123 and \python\demo_board_examples\
ltc2123 directories, respectively. The main scripts run
through a series of tests, concluding with capturing
data from all four channels and displaying time and
frequency domain plots.
3) Do NOT plug the USB cable into the DC2159 FMC
Communication Interface board before powering up
the KC705 board.
4) Refer to Figure 2. Power up the KC705 board using
the adapter supplied with the KC705. If the board
was obtained from Linear Technology as part of a
kit, the correct bitfile was installed into the onboard
configuration PROM.
5) If necessary, load the .bit file (included in the design
files PDF subdirectory) into the KC705 board using
the appropriate Xilinx tool (Impact, Vivado, or Vivado
lab). Alternatively, create a .mcs file from the bitfile
and load into the onboard configuration PROM. (See
KC705 documentation for details.)
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6) Connect the DC2159 FMC board to the host PC with
a USB-A /Mini-B cable.
7) Apply 6V and 3V to the turret posts as shown in
Figure 2. Both supplies should be low-noise benchtop
supplies, with current limit set to 2A.
8) Apply analog input signals to J2, J3, J4, J5. The
DC2226A is populated with an input network that has
50Ω characteristic impedance over a wide frequency
range, refer to LTC2123 data sheet for details. A
70MHz, 1.5V sine wave is a good starting point
P-P
for testing DC2226A. If an RF generator is used, it
should be followed by a bandpass filter to limit noise
and harmonics. Alternatively, DC1164 High Speed
ADC Signal Source may be used.
9) Run the appropriate test script (Ltc2123Dc2226Du-
alClockingSolution.m for Matlab, ltc2123_dc2226_
dual_clocking_solution.py for Python). Plots similar
to Figures 3 and 4 should appear. At this point, data is
stored in program variables for further manipulation
and testing.
10) The default test scripts set the ADC sample rate to
250MSPS, with a SYSREF frequency of 15.625MHz
(JESD204B K=16). Design examples on the LTC6951
product page detail the process for changing clock
frequencies.
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