Analog Devices HSC-ADC-EVALC User Manual
High Speed Converter Evaluation Platform
FEATURES
Xilinx Virtex-4 FPGA-based buffer memory board
Used for capturing digital data from high speed ADC
evaluation boards to simplify evaluation
64 kB FIFO depth
Parallel input at 644 MSPS SDR and 800 MSPS DDR
Supports 1.8 V, 2.5 V, and 3.3 V CMOS and LVDS interfaces
Supports multiple ADC channels up to 18 bits
Measures performance with VisualAnalog
Real-time FFT and time domain analysis
Analyzes SNR, SINAD, SFDR, and harmonics
Simple USB port interface (2.0)
Supports ADCs with serial port interfaces (SPI)
FPGA reconfigurable via JTAG, on-board EPROM, or USB
On-board regulator circuit speeds setup
5 V, 3 A switching power supply included
Compatible with Windows 98 (2nd edition), Windows 2000,
Windows ME, and Windows XP
EQUIPMENT NEEDED
Analog signal source and antialiasing filter
Low jitter clock source
High speed ADC evaluation board and ADC data sheet
PC running Windows 98 (2nd edition), Windows 2000,
Windows ME, or Windows XP
Latest version of VisualAnalog
USB 2.0 port recommended (USB 1.1 compatible)
FUNCTIONAL BLOCK DIAGRAM
HSC-ADC-EVALC
PRODUCT HIGHLIGHTS
1. Easy to Set Up. Connect the included power supply along
with the CLK and AIN signal sources to the two evaluation
boards. Then connect to the PC via the USB port and
evaluate the performance instantly.
2. USB Port Connection to PC. PC interface is via a USB 2.0
connection (1.1 compatible) to the PC. A USB cable is
provided in the kit.
3. 64 kB FIFO. The on-board FPGA contains an integrated
FIFO to store data captured from the ADC for subsequent
processing.
4. Up to 644 MSPS SDR/800 MSPS DDR Encode Rates on
Each Channel. Multichannel ADCs with encode rates up
to 644 MSPS SDR and 800 MSPS DDR can be used with
the ADC capture board.
5. Supports ADCs with Serial Port Interface or SPI. Some
ADCs include a feature set that can be changed via the
SPI. The ADC capture board supports these SPI-driven
features through the existing USB connection to the
computer without additional cabling needed.
6. VisualAnalog™. VisualAnalog supports the HSC-ADC-
EVALC hardware platform as well as enabling virtual ADC
evaluation using ADIsimADC™, Analog Devices proprietary
behavioral modeling technology. This allows rapid comparison between multiple ADCs, with or without hardware
evaluation boards. For more information, see AN-737 at
www.analog.com/VisualAnalog.
CLOCK
CIRCUIT
REGULATORS
ADC
ON-BOARD
VOLTAGE
LOGIC
SPI
POWER
CONNECTOR
SINGLE OR MULTICHANNEL
HIGH SPEED ADC
EVALUATION BOARD
FILTERED
ANALOG
INPUT
CLOCK INP UT
Rev. 0
Evaluation boards are only intended for device evaluation and not for production purposes.
Evaluation boards as supplied “as is” and without warranties of any kind, express, implied, or
statutory including, but not limited to, any implied warranty of merchantability or fitness for a
particular purpose. No license is granted by implication or otherwise under any patents or other
intellectual property by application or use of evaluation boards. Information furnished by Analog
Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog
Devices for its use, nor for any infringements of pate nts or other rights of third parties t hat may result
from its use. Analog Devices reserves the right to change devices or specifications at any time
without notice. Trademarks and registered trademarks are the property of their respective owners.
Evaluation boards are not authorized to be used in life support devices or systems.
HSC-ADC-EVALC
FPGA
CONFIGURATION
MODE
DATA BUS 2(18 )
n
J3*
CLKA(2)
DATA BUS 1(18 )
n
J2*
CLKB(2)
EXT SYNC1
EXT SYNC2
FPGA GPIO(8)
SPI(7)
J1*
USB DIRECT( 5 )
*DATA CONVE RTE R I/O CONNECTORS
FPGA
LED2 LED1
FPGA
DONE
Figure 1.
USB
CAPTUREUPLOAD
DATA(16)
FIFO
CONTROL(9)
PORTB
PORTD
USB
CONTROLLER
PORTC
PORTE
PORTA
USB
CONFIG
PROM
FPGA
CONFIG
PROM
RECONFIG
CONNECTOR
ONBOARD
VOLTAGE
REGULATORS
POWER
CONNECTOR
JTAG
CONNECTOR
USB
J6
J4
J10
STANDARD
USB 2.0
06676-001
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
HSC-ADC-EVALC
TABLE OF CONTENTS
Features.............................................................................................. 1
Equipment Needed........................................................................... 1
Product Highlights ........................................................................... 1
Functional Block Diagram .............................................................. 1
Revision History ............................................................................... 2
Product Description......................................................................... 3
Evaluation Board Description......................................................... 3
Evaluation Board Hardware............................................................ 4
HSC-ADC-EVALC ADC Capture Board Easy Start ............... 4
Power Supplies .............................................................................. 4
Connection and Setup ................................................................. 4
Jumpers.......................................................................................... 5
HSC-ADC-EVALC ADC Capture Board Features.................. 6
HSC-ADC-EVALC Supported ADC Evaluation Boards........ 7
Theory of Operation .........................................................................8
Configuration ................................................................................8
Input Circuitry...............................................................................8
Data Capture..................................................................................8
Code Description ..........................................................................8
FPGA Configuration and Customization..................................8
Evaluation Board Schematics and Artwork...................................9
HSC-ADC-EVALC Schematics...................................................9
PCB Layout ................................................................................. 23
I/O Connector—J1, J2, and J3 Pin Mapping .......................... 24
Ordering Information.................................................................... 28
Bill of Materials (RoHS Compliant) ........................................ 28
Ordering Guide .......................................................................... 30
ESD Caution................................................................................ 30
REVISION HISTORY
4/07—Revision 0: Initial Version
Rev. 0 | Page 2 of 32
HSC-ADC-EVALC
PRODUCT DESCRIPTION
The Analog Devices, Inc. high speed converter evaluation
platform (HSC-ADC-EVALC) includes the latest version of
VisualAnalog and an FPGA-based buffer memory board to capture
blocks of digital data from the Analog Devices high speed
analog-to-digital converter (ADC) evaluation boards. The ADC
capture board is connected to the PC through a USB port and is
used with VisualAnalog to quickly evaluate the performance of
high speed ADCs. Users can view an FFT for a specific analog
input and encode rate to analyze SNR, SINAD, SFDR, and
harmonic information.
The ADC capture board is easy to set up. Additional equipment
needed includes an Analog Devices high speed ADC evaluation
board, a signal source, and a clock source. Once the kit is
connected and powered, the evaluation is enabled instantly on
the PC.
The ADC capture board enables numerous expansion and
evaluation possibilities by virtue of its powerful reconfigurable
FPGA core.
The system can acquire digital data at speeds up to 644 MSPS
single data rate (SDR) and 800 MSPS double data rate (DDR).
The FPGA contains an integrated FIFO memory that allows
capture of data record lengths up to a total of 64 kB. A USB 2.0
microcontroller communicating with VisualAnalog allows
for easy interfacing to newer computers using the USB 2.0
(USB 1.1 compatible) interface.
EVALUATION BOARD DESCRIPTION
The ADC capture board provides all of the support circuitry
required to accept two 18-bit channels from an ADC’s parallel
CMOS or LVDS outputs. Various functions such as FPGA
configuration load options and I/O logic levels can be selected by
proper connection of various jumpers or switches (see
When using the HSC-ADC-EVALC in conjunction with an
ADC evaluation board, it is critical that the signal sources used
for the ADC board’s analog input and clock have very low phase
noise (<1 ps rms jitter) to achieve the ultimate performance of
the converter.
Proper filtering of the analog input signal to remove harmonics
and lower the integrated or broadband noise at the input is also
necessary to achieve the specified noise performance.
Figure 5 to Figure 20 for complete schematics and layout plots.
See
Tabl e 1).
Rev. 0 | Page 3 of 32
HSC-ADC-EVALC
EVALUATION BOARD HARDWARE
HSC-ADC-EVALC ADC CAPTURE BOARD
EASY START
Requirements
• HSC-ADC-EVALC ADC capture board, VisualAnalog, 5 V
wall transformer, and USB cable
• High speed ADC evaluation board and ADC data sheet
• Power supply for ADC evaluation board
• Analog signal source and appropriate filtering
• Low jitter clock source applicable for specific ADC
evaluation, typically <1 ps rms jitter
• PC running Windows® 98 (2nd edition), Windows 2000,
Windows ME, or Windows XP
• PC with a USB 2.0 port recommended (USB 1.1 compatible)
Easy Start Steps
Important Note
Administrative rights for the Windows operating systems are
needed during the entire easy start procedure.
Completion of every step before reverting to a normal user
mode is recommended.
1. Install VisualAnalog from the CD provided in the ADC
capture board kit or download the latest version from the
Web. For the latest updates to the software, check the
Analog Devices website at
2. Connect the ADC capture board to the ADC evaluation
board. If an adapter is required, insert the adapter between
the ADC evaluation board and the ADC capture board.
3. Connect the provided USB cable to the ADC capture board
and to an available USB port on the computer.
4. Refer to
logic level to match the level coming from the ADC evaluation board. 1.8 V is default; 2.5 V and 3.3 V are jumper
selectable. Most evaluation boards can be used with the
default settings.
5. The ADC capture board is supplied with a wall mount
switching power supply. Connect the supply end to an ac
wall outlet rated for 100 Vac to 240 Vac at 47 Hz to 63 Hz.
The other end is a 2.1 mm inner diameter jack that connects
to the PCB at J4.
Table 1 for setting the ADC capture board’s I/O
www.analog.com/FIFO.
6. Once the USB cable is connected to both the computer and
the HSC-ADC-EVALC board, and power is applied, the
USB driver starts to install. The Found New Hardware
Wizard opens and prompts you through the automated
install process.
7. (Optional) Verify in the Windows device manager that
Analog Devices ADC-HSC-EVALC is listed under the
USB hardware.
8. Refer to the instructions included in the respective ADC
data sheet found at
information about connecting the ADC evaluation board’s
power supply and other requirements. After verification of
power supply connections, apply power to the ADC
evaluation board and check the voltage levels on the ADC
board to make sure they are correct.
9. Make sure the evaluation boards are powered on before
connecting the analog input and clock. Connect the
appropriate analog input (which should be filtered with a
band-pass filter) and low jitter clock signal.
10. Refer to the VisualAnalog User Manual at
www.analog.com/FIFO for detailed software operating
instructions.
www.analog.com/FIFO for more
POWER SUPPLIES
The ADC capture board is supplied with a wall mount switching power supply that provides a 5 V, 3 A maximum output.
Connect the supply to the rated 100 Vac to 240 Vac wall outlet at
47 Hz to 63 Hz. The other end is a 2.1 mm inner diameter jack
that connects to the PCB at J4. On the PC board, the supply is
fused and conditioned before connecting to the regulators that
supply the proper bias to the entire ADC capture board.
CONNECTION AND SETUP
The ADC capture board has two 40-pin connectors (J2 and J3)
that accept two 18-bit channels of parallel CMOS or LVDS
inputs from the ADC (see
(J1) is used to pass SPI and other USB/FPGA control signals
across to adjacent ADC evaluation boards that support these
features.
Figure 2). The third 40-pin connector
Rev. 0 | Page 4 of 32
HSC-ADC-EVALC
T
WALL OUTLE
100V TO 240V AC
47Hz TO 63Hz
ROHDE & SCHWARZ,
SMHU,
2V p-p SIGNAL
SYNTHESIZER
ROHDE & SCHWARZ,
SMHU,
2V p-p SIGNAL
SYNTHESIZER
SWITCHING
POWER
SUPPLY
BAND-PASS
FILTER
EVALUATION
BOARD
XFMR
INPUT
CLK
DATA BUS 2
PARALLEL
LVDS/ CMOS
OUTPUTS
DATA BUS 1
PARALLEL
LVDS/ CMOS
OUTPUTS
SPI
5V DC
3A MAX
ONBOARD POW ER
SUPPLY
PS
–+
REG
GND
V
HSC-ADC-EVALC
DATA CAPTURE
BOARD
USB
CONNECTION
SPI
PC
RUNNING
VisualAnalog
06676-004
Figure 2. Example Setup Using ADC Evaluation Board and HSC-ADC-EVALC ADC Capture Board
JUMPERS
Default Settings
Tabl e 1 lists the default settings for the HSC-ADC-EVALC evaluation kit.
Table 1. Jumper Configurations
Jumper Number Description
J9, Pin 1 to Pin 2 (1.8 V) Default. Sets FPGA I/O voltage to 1.8 V logic (hardwired, do not remove).
J9, Pin 3 to Pin 4 (2.5 V) Install single jumper here to set FPGA I/O voltage to 2.5 V logic.
J9, Pin 5 to Pin 6 (3.3 V) Install single jumper here to set FPGA I/O voltage to 3.3 V logic.
Table 2. FPGA Configuration Mode
U4 DIP Switch Setting M0 M1 M2 M3 M4
FPGA Configured via EEPROM On On On Reserved Reserved
FPGA Configured via USB (Default) On Off Off Reserved Reserved
Rev. 0 | Page 5 of 32
HSC-ADC-EVALC
HSC-ADC-EVALC ADC CAPTURE BOARD FEATURES
GENERAL PURPOSE I/O,
USB/SPI CONTROL DATA BUS 1 DATA BUS 2
FPGA LOAD
XILINX
VIRTEX-4
FPGA
SELECT
DEBUG
PINS
EXTERNAL
SYNC I/O
CYPRESS USB
CONTROLLER
USB CONNECTOR FPGA JTAG
CONNECTOR
Figure 3. HSC-ADC-EVALC Components (Top View)
5VDC POWER
INPUT
ON BOARD
POWER SUPPLY
100MHz
OSCILLATOR
FPGA I/O
VOLTAGE MODE
FPGA CONFIG
PROM
06676-002
Rev. 0 | Page 6 of 32
HSC-ADC-EVALC
06676-003
Figure 4. HSC-ADC-EVALC Components (Bottom View)
HSC-ADC-EVALC SUPPORTED ADC EVALUATION BOARDS
Refer to the Analog Devices ADC capture board product page at www.analog.com/FIFO for a list of HSC-ADC-EVALC-compatible ADC
evaluation boards. Some legacy ADC boards may require interposer cards to facilitate proper pin mapping to the ADC capture board. If
needed, the interposer part number is noted in the compatibility table at
www.analog.com/FIFO for the respective data converter.
Rev. 0 | Page 7 of 32
HSC-ADC-EVALC
THEORY OF OPERATION
The HSC-ADC-EVALC evaluation platform is based around
the Virtex-4 FPGA (XC4VFX20-10FFG672C) from Xilinx®,
which can be programmed through VisualAnalog to operate
with a variety of data converters. Another key component, the
Cypress USB device (U3), communicates with a host PC and
provides the SPI interface used for configuration.
CONFIGURATION
Some converter devices require programming for mode or
feature selection, which the SPI controller accomplishes using
SPI-accessible register maps. U3 drives the 4-wire SPI (SCLK,
SDI, SDO, CSB
(J1). For more information on serial port interface (SPI) functions, consult the user manual titled Interfacing to High Speed
ADCs via SPI at
The SPI interface designed on the Cypress IC can communicate
with up to five different SPI-enabled devices including the
FPGA. The CLK and SDI/SDO data lines are common to all SPI
devices. The desired SPI-enabled device is selected for control
by using one of the five active low chip select (CS) pins. This
functionality is controlled by selecting a SPI channel in the SPI
Controller software.
At power-up, VisualAnalog attempts to autodetect the converter
that is attached to the ADC capture board using the SPI
interface. If a recognized device is found, VisualAnalog selects
the appropriate FPGA configuration; otherwise, the user is
prompted to make the device selection. In either case,
VisualAnalog then programs the FPGA using the SPI interface
of U3. The configurations typically program a FIFO data capture
function within the FPGA.
1
) signals to the converter board via connector
www.analog.com/FIFO.
INPUT CIRCUITRY
The parallel data input pins of the FPGA, which interface to the
converter, are configurable. They can operate with 1.8 V, 2.5 V,
or 3.3 V logic levels and can accept LVDS or CMOS inputs.
Each channel of the ADC capture board requires a clock signal
to capture data. These clock signals are normally provided by
the attached ADC evaluation board and are passed along with
the data through one or more pins on Connector J2 and/or
Connector J3. Refer to the HSC-ADC-EVALC I/O connector
pin mappings shown in
Figure 21 and Figure 22.
DATA CAPTURE
The process of filling the FIFO and reading the data back
requires several steps.
1. VisualAnalog initiates the FIFO fill process by resetting
the FIFOs.
2. The 48 MHz USB read clock (RCLK) is then suspended to
ensure that it does not add noise to the ADC input.
3. VisualAnalog waits approximately 30 ms to allow for data
capture before beginning the readback process. This wait
time is an adjustable parameter in VisualAnalog.
4. VisualAnalog reads the data from the FIFO through the
USB interface to the PC.
CODE DESCRIPTION
FPGA configuration files are provided by ADI for all ADCs
supported by the HSC-ADC-EVALC evaluation platform.
These files are designed and tested to facilitate quick
performance evaluations of Analog Devices data converters. No
additional FPGA programming is required from the user for
typical operation.
FPGA CONFIGURATION AND CUSTOMIZATION
Users can manually customize or update the FPGA code
through a JTAG connector (J10) provided on the ADC capture
board, as shown in
provides no support or guarantee of performance if the
provided code is customized by the user.
The HSC-ADC-EVALC hardware platform may contain additional circuit functions to support future developments and
capabilities. These functions are not supported beyond the
scope of this data sheet and the Analog Devices supplied datacapture FPGA routines at this time.
Additional FPGA programming support may be available
through the user’s local Xilinx representative or distributor.
1
Note that CSB1 is the default CSB line used.
Figure 17. However, Analog Devices
Rev. 0 | Page 8 of 32
HSC-ADC-EVALC
EVALUATION BOARD SCHEMATICS AND ARTWORK
HSC-ADC-EVALC SCHEMATICS
TYCO AND DSP EZ–KIT CONNECTOR TO FPGA
XC4VFX20-10F FG672C XC4VFX20-10F FG672C
R50
51.1Ω
XC4VFX20-10F FG672C
R38
100Ω
Figure 5.
R39
100Ω
XC4VFX20-10F FG672C
6676-005
Rev. 0 | Page 9 of 32
HSC-ADC-EVALC
SRAM ADDRESS AND CONTROL
R25
3.74KΩ
R27
249Ω
R28
3.74KΩ
R31
3.74KΩ
R33
249Ω
R1
100Ω
R40
3.74KΩ
R44
3.74KΩ
R42
3.74KΩ
R41
3.74KΩ
R43
3.74KΩ
U21
NC7SZ05M5X
Figure 6.
FPGA CONTROLS
XC4VFX20-10F FG672C
6676-006
Rev. 0 | Page 10 of 32
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