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dc2226Afa

DEMO MANUAL DC2226

QUICK START PROCEDURE

1) Install PScope™ from http://www.linear.com/solu-

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

Pythonscriptscanexportdatafilesthatmaybeopened

in PScope for analysis.

2) Install LinearLabTools from http://www.linear.com/

solutions/linearlabtools,followingtheprocedureforei-

therMatlaborPython.BothMatlabandPythoncodefor

DC2226A are included in the \matlab\DemoBoardEx-

amples\LTC2123and\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.)

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

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.