Linear Technology DC2226A Guida rapida alla configurazione
1
dc2226Afa
DEMO MANUAL DC2226A
DESCRIPTION
LTC6951
Multichannel JESD204B ADC
with Clocking
Demonstration Circuit 2226A-A is a reference design
for a four-channel, 250Msps ADC system consist-
ing of two LT C
®
2123, dual 14-bit 250Msps ADCs and
a JESD204B Subclass 1 clocking solution based on
the LTC6951 Clock Synthesizer with Integrated VCO.
Other dash options reserved for future use. No external
clock source is required to operate the board;however,
the onboard 100MHz reference oscillator may be by-
passed, allowing synchronization to other equipment.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ParallelSync and PScope are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
Figure 1 is a block diagram of the DC2226A clock con-
figuration, consisting of two LTC6951s in a JESD204B
subclass 1, ParallelSync™configuration. More detailed
information is available on the LTC6951 product page.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2226A
/1
/1
/1
10k
BB
LTC6951#2
U10
V+VCP+WCO+
CP
TUNE
OUT4+
OUT4–125MHz, FPGA CLOCK
15.625MHz, ADC2 SYSREF
2GHz, MUTED
250MHz, ADC2 CLOCK
PWRDN
OUT3+
OUT3–
OUT0+
OUT0–
OUT1+
OUT1–
OUT2+
OUT2–
1nF
56.2Ω
56.2Ω
BVCO
1µF
REF–
CMA
CMB
CMC
TB
1µF
100Ω
REF+
SYNC
1µF
1µF
470nF
1.5nF
68nF
10Ω 5V3.3V
BB
LTC6951#1
U13
V+VCP+WCO+
CP
TUNE
OUT4+
OUT4–15.625MHz, FPGA SYSREF
15.625MHz, ADC1 SYSREF
2GHz, MUTED
250MHz, ADC1 CLOCK
PWRDN
DC2226 F01
OUT3+
OUT3–
OUT0+
OUT0–
OUT1+
OUT1–
OUT2+
OUT2–
1nF
56.2Ω
56.2Ω
BVCO
1µF
REF–
CMA
CMB
CMC
TB
1µF
100Ω
REF+
SYNC
1µF
1µF
470nF
1.5nF
68nF
10Ω 5V3.3V
CK
D
SYNC
PULSE
LTC6951
REF INPUT
LTC6951
SYNC PULSE SYNC TO REF TIMING
SYNC HELD HIGH A
MINIMUM OF 1ms
LTC6954-4
REFERENCE DISTRIBUTION
IN+
IN–
OUT0SEL
OUT1SEL
OUT2SEL
1µF
100MHz
REFERENCE
50Ω
1µF
Q
CK
D Q
OUT0+
OUT0–
OUT1+
OUT1–
OUT2+
OUT2–
1µF
10k
10k
VCC
Figure 1. Subclass 1 ParallelSync Design Example
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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
Python scripts can export data filesthat may be opened
in PScope for analysis.
2) Install LinearLabTools from http://www.linear.com/
solutions/linearlabtools,following theprocedure forei-
ther Matlab orPython. Both Matlaband Python codefor
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
Figure2. 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, 1.5VP-P sine wave is a good starting point
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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dc2226Afa
DEMO MANUAL DC2226A
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
HARDWARE SETUP
DC2226A Power Connections
E14: +6V Power Input. Connect to a low-noise supply set
to a current limit of 2A.
E12: +3V Power Input. Connect to a low-noise supply set
to a current limit of 2A.
E1, E9: GND - Ground connections for power supplies.
E5, E8: 1.8V test points. Measure 1.8V supply voltages
at these points. (Measurement only, do not apply power.)
E4, E6, E11: 3V3_1, 3V3_2, 3V3_3 test points. Measure
3.3V supply voltages at these points. (Measurement only,
do not apply power.)
E7, E13: 5V_1, 5V_2 test points. Measure 5V supply
voltages at these points. (Measurement only, do not ap-
ply power.)
DC2226A Signal Connections
J2, J3: Analog inputs for U1, 50Ω impedance. Maximum
signal level is 1.5VP-P.
J4, J5: Analog inputs for U3, 50Ω impedance. Maximum
signal level is 1.5VP-P.
J1:External Reference ClockInput. Not connected,requires
component changes, refer to schematic.
J6: FMC HPC interface to FPGA carrier board.
APPENDIX A
Xilinx KC705 Based Evaluation System
The DC2226A system consists of the DC2226A itself,
a Xilinx KC705 FPGA evaluation board, a DC2159 USB
communication board, and a host PC running the various
test programs. Complete systems that ship from Linear
Technology will have the KC705 board configured to
automatically load the default FPGA image for DC2226A
from the onboard configuration EEPROM. The procedure
for bringing up the system is as follows:
1) If the boards were obtained separately, assemble them
as shown in Figure 1 (FMC connectors are fragile,
make sure they are properly aligned before seating.)
2) Connect power supply to the KC705 board and turn
on the power switch. If the assembled system was
obtained from Linear Technology, the FPGA bitstream
will load automatically from the onboard configuration
memory.
3) Boards not obtained from Linear Technology will need
to be configured as described in the Alternate FPGA
Configuration section.
4) Apply power and analog input signals to the DC2226A
board.
5) Verify that PScope software is installed. Connect
DC2159 to the host PC with a USB-mini cable. Driver
installation will start automatically and PScope will
recognize the system when installation finishes. Quit
PScope and run Matlab/Python test scripts.
Note: Power must be applied to the KC705 board when
the USB cable is connected or the driver installation will
not complete properly.
Alternate FPGA Configuration
KC705 boards not obtained from Linear Technology will
need to be configured via JTAG. FPGA images are located
in the PScope installation directory in the FPGA_images
folder. Connect a USB micro cable to the JTAG USB con-
nector on the KC705 board and use a Xilinx tool such as
Impact or Vivado Lab Edition to load the bitfile. Once the
FPGA is configured, remove the USB cable and exit the
software. (The onboard JTAG adapter and the DC2159
USB communication board use the same USB controller
and they may interfere with one another.)
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dc2226Afa
DEMO MANUAL DC2226
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2016
LT 1216 REV A • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application
engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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