iiReference ManualAltera Corporation
Cyclone II DSP Development Board PreliminaryAugust 2006
Contents
About This Manual
Revision History ........................................................................................................................................ v
How to Contact Altera .............................................................................................................................. v
Typographic Conventions ...................................................................................................................... vi
Features Overview ................................................................................................................................. 1–1
Featured Device ..................................................................................................................................... 2–9
User Interfaces ........................................................................................................................................ 2–9
User-Defined LEDs (D2 Through D9) ......................................................................................... 2–10
User Defined DIP Switch (S1) ....................................................................................................... 2–11
User-Defined Pushbuttons (SW2 Through SW5) ...................................................................... 2–12
Power Supply ....................................................................................................................................... 2–65
DC Power Input Jack (J1) .............................................................................................................. 2–65
Voltage Limiter Switches (U13-U15, U18 & U19) ...................................................................... 2–66
Altera literature serviceslit_req@altera.comlit_req@altera.com
Non-technical customer
service
FTP siteftp.altera.comftp.altera.com
The table below displays the revision history for the chapters in this
manual.
For technical support or other information about Altera® products, go to
the Altera world-wide web site at www.altera.com. You can also contact
Altera through your local sales representative or any of the sources listed
below.
800-800-EPLD (3753)
7:00 a.m. to 5:00 p.m. Pacific Time
800-767-3753+ 1 408-544-7000
+1 408-544-8767
7:00 a.m. to 5:00 p.m. (GMT -8:00)
Pacific Time
7:00 a.m. to 5:00 p.m. (GMT -8:00)
Pacific Time
Altera Corporation Reference Manualv
August 2006Cyclone II DSP Development Board
Typographic Conventions
Typographic
This document uses the typographic conventions shown below.
Conventions
Visual CueMeaning
Bold Type with Initial
Capital Letters
bold type External timing parameters, directory names, project names, disk drive names,
Italic Type with Initial
Capital Letters
Italic type Internal timing parameters and variables are shown in italic type.
Initial Capital LettersKeyboard keys and menu names are shown with initial capital letters.
“Subheading Title”References to sections within a document and titles of on-line help topics are shown
Courier type
Command names, dialog box titles, checkbox options, and dialog box options are
shown in bold, initial capital letters.
Example: Save As dialog box.
filenames, filename extensions, and software utility names are shown in bold type.
Examples: f
Document titles are shown in italic type with initial capital letters.
Example: AN 75: High-Speed Board Design.
Examples: t
Variable names are enclosed in angle brackets (< >) and shown in italic type. Example:
<file name>, <project name>.pof file.
Examples: Delete key, the Options menu.
in quotation marks.
Example: “Typographic Conventions.”
Signal and port names are shown in lowercase Courier type.
Examples:
Active-low signals are denoted by suffix
Anything that must be typed exactly as it appears is shown in Courier type (for
example:
Also, sections of an actual file, such as a Report File, references to parts of files (for
example, the AHDL keyword
example,
1., 2., 3., and
a., b., c., and so on
● •Bullets are used in a list of items when the sequence of the items is not important.
■
v The checkmark indicates a procedure that consists of one step only.
1 The hand points to information that requires special attention.
c
w
r The angled arrow indicates you should press the Enter key.
f The feet direct you to more information on a particular topic.
viReference ManualAltera Corporation
Cyclone II DSP Development BoardAugust 2006
Numbered steps are used in a list of items when the sequence of the items is
important, such as the steps listed in a procedure.
The caution indicates required information that needs special consideration and
understanding and should be read prior to starting or continuing with the procedure or
process.
The warning indicates information that should be read prior to starting or continuing
the procedure or processes
c:\qdesigns\tutorial\chiptrip.gdf.
SUBDESIGN), as well as logic function names (for
TRI) are shown in Courier.
Chapter 1. Introduction
Introduction
Features
Overview
This document describes the hardware features of the Cyclone™ II DSP
development board, including detailed pin-out information, to enable
designers to create custom FPGA designs that interface with all
components on the board.
fFor information on setting up and powering up the Cyclone II DSP
development board and installing the included software, refer to the
DSP Development Kit, Cyclone II Edition Getting Started User Guide.
The Cyclone II DSP development board is included in the
DSP Development Kit, Cyclone II Edition (ordering code DK-DSP-2C70N).
The Cyclone II DSP development board provides a low-cost hardware
platform for developing high performance DSP designs based on Altera
Cyclone II FPGA devices. The DSP Development Kit, Cyclone II Edition
features the EP2C70F672 FPGA.
Components
■Analog I/O
●Two 14-bit analog-to-digital (A/D) converter channels with
125 MSPS and 70 dB signal-to-noise ratio capabilities
●Two 14-bit digital-to-analog (D/A) converter channels with
165 MSPS and 70 dB signal-to-noise ratio capabilities
●One 24-bit RGB VGA adapter with a DB-15 connector
●One Audio CODEC with input, output, and amplified output
■Memory Subsystem
●256 Mbyte DDR2 SDRAM DIMM
●1 Mbyte synchronous SRAM (SSRAM)
■Two EPCS64 64 Mbit serial configuration devices
■Debugging Interface—Mictor connector for hardware and software
debugging
■Expansion Interfaces
●3.3-V/5-V tolerant Altera expansion/prototype headers
connector to connect to the Spectrum Digital DSP Starter Kit
(DSK) for the TMS320C6416, Revision E
■Dual seven-segment LED displays
■Eight user-defined LEDs
®
Altera Corporation Reference Manual1–1
August 2006Preliminary
Features Overview
■One user programmable dual in-line package (DIP) switch
(8 positions)
■Four user-defined push-buttons
Figure 1–1 shows a functional diagram of the Cyclone II DSP
development board.
Figure 1–1. Cyclone II DSP Development Board Functional Diagram
Channel A
Channel B
Connector
Altera Daughter Card
SMA
SMA
SMA
SMA
DB-15
Seven-Segment Display
TI-EVM Connector
256K X 36 SSRAM
100-MHz
On-Board Oscillator
Custom Oscillator
Mictor Connector
A/D
Converter
D/A
Converter
A/D
Converter
D/A
Converter
VGA
DDR2
14
14
14
Cyclone II
FPGA
14
24
75
32
41
SDRAM DIMM
JTAG Connector
ASI Connector
Audio CODEC
User-Defined
LEDs
User-Defined
Pushbuttons
User-Defined
Dipswitches
Flash Memory
Safe Mode
Flash Memory
User Mode
1–2Reference ManualAltera Corporation
Cyclone II DSP Development BoardAugust 2006
Chapter 2. Cyclone II DSP
Development
Board Components
Introduction
Components &
Interfaces
fSoftware and hardware installation and setup are described in the DSP
This chapter describes the Cyclone II DSP development board
components.
This section introduces the major components on the Cyclone II DSP
development board by first listing them in Table 2–1 on page 2–4. A
detailed description of each component comprises the remainder of this
chapter.
1A schematic, a physical layout database, and manufacturing
files for the Cyclone II DSP development board are included in
the DSP Development Kit, Cyclone II Edition at the following
directory:
Two EPCS64 64 Mbit flash memory, serial
configuration devices used to store the safe
(factory) design (U17) and a user design (U36).
The EPCS64 device configures the EP2C70
FPGA by downloading the factory design or the
user design to the EP2C70 FPGA each time the
Cyclone II DSP development board powers up
or on board reset. J29 determines which design
is used.
9 Mbit, 256 Kbit x 36-bit/512 Kbit x 18 pipelined
synchronous SRAM (SSRAM).
The TMS320C6416 processor memory maps to
the Cyclone II DSP development board’s
SSRAM and the EP2C70 FPGA through the
EMIF connector (U34 and U40).
Expansion Connectors
J15, J22, J23Expansion Prototype
Connector
U34, U40Expansion TI-EVM
connectors
Three connectors collectively called the
Expansion Prototype Connector. They are used
to connect to Altera daughter cards or for
debugging and prototyping purposes.
Connects to the EMIF connector on the
TMS320C6416 DSK development board.
U34 and U40 are located on the back of the
Cyclone II DSP development board.
General Connectors
J9JTAG connectorThe Joint Test Action Group (JTAG) connector
J13ASI connectorThe active serial interface (ASI) connector is
J12Mictor connectorThe Mictor connector used for hardware and
J17CLK SMA connector SMA connector for an external clock input to
is used to directly configure the EP2C70 FPGA.
used to program the EPCS64.
software debugging. It can be used with
external scopes or external logic analyzers.
U16 to generate FPGA clocks.
2–26
2–38
2–39
2–42
2–43
2–43
2–47
2–50
2–50
2–52
2–53
2–61
Altera Corporation Reference Manual2–5
August 2006Cyclone II DSP Development Board
Components & Interfaces
Table 2–1. Cyclone II DSP Development Board Components & Interfaces (Part 3 of 5)
Board ReferenceNameDescriptionPage
J11DIMM_SYNC_CLK
SMA connector
The SMA connector (
test point SMA for eye diagrams of DDR2
signals using AC-coupled SMA connections to
an oscilloscope.
DIMM_SYNC_CLK) is a
Jumpers
J18On-board or custom
clock oscillator select
jumper
J19Clock select jumperJumper that determines which input to U16 (the
J24SSRAM SLEEP
mode or RUN mode
jumper
J75 V enable/disable
jumper for U10
J25D/A converter power
J28A/D converter power
J33D/A converter voltage
J29EPCS select jumperJumper that selects the configuration mode
J30 (Channel A)
J38 (Channel B)
J35 (Channel A)
J34 (Channel B)
J37 (Channel A)
J36 (Channel B)
supply jumper
supply jumper
select jumper
Data Format Select
(DFS) jumper
D/A converter clock
select jumper
A/D converter clock
select jumper
Jumper that determines if the on-board clock
100 MHz oscillator (U20) or a custom clock
oscillator (J20) becomes the input clock
oscillator to the clock buffer (U16).
selected clock oscillator or the SMA clock) will
be used to determine the clock outputs of U16.
Jumper that selects SLEEP mode or RUN mode
on the SSRAM.
J7 disables the on-board 5-volt voltage
regulator (U10) output to eliminate all regulatorbased noise.
Jumper that selects whether the D/A converter
is powered from the DC input jack or the bench
power supply connector (J39 and J40).
Jumper that selects whether the A/D converter
is powered from the DC input jack or the bench
power supply connector (J42 and J41).
Jumper that determines whether the D/A
converter is powered at 3.3 volts or 5.0 volts.
(SAFE EPCS or USER EPCS)
Data Format Select (DFS) jumper selects the
data output format from the Texas Instruments
ADS5520 A/D converter (U26 and U31). There
are four data output formats.
D/A Converter Channel A clock select jumper. It
determines the D/A converter clock from three
input clock signals, the OSC clock, the FPGA
D/A converter clock, or the SMA clock (J26).
A/D converter Channel A clock select jumper. It
determines the A/D converter clock from three
input clock signals, the OSC clock, the FPGA
A/D converter clock, or the SMA clock (J27).
2–36
2–61
2–62
2–37
2–69
2–70
2–70
2–63
2–37
2–21
2–62
2–62
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Cyclone II DSP Development BoardAugust 2006
Cyclone II DSP Development Board Components
Table 2–1. Cyclone II DSP Development Board Components & Interfaces (Part 4 of 5)
Board ReferenceNameDescriptionPage
Status LEDs & Reset/Power Switches2–57
D1Power LEDIndicates when power is present.2–57
D10Status LEDIndicates successful configuration of the
Cyclone II DSP development board
(
CONFIG_DONEn is asserted).
SW1Power switchPower switch that is used to apply power to the
on-board power regulators.
SW6User-defined reset
push-button
SW7System reset
push-button
Clocks2–59
J20Socket for connecting
custom clock
oscillator
U16Clock bufferU16 is the clock buffer for the five clocks on the
U20On-board clock
oscillator
U27D/A converter clock
buffer
U29A/D converter
differential LVPECL
buffer
U28A/D converter
differential LVPECL
buffer
USER RESET is user-defined
momentary-contact push-button used to reset
and initialize a user design on the Cyclone II
DSP development board.
SYS RESET is a momentary-contact pushbutton used to reset the hardware and configure
the Cyclone II DSP development board with the
design stored in the EPCS64 selected by J29.
Socket on top of U20 where a half-can clock
oscillator can be installed. It is referred to as the
custom clock oscillator. It can be an input to
U16.
Cyclone II DSP development board.
The on-board clock oscillator is the ECS, Inc.
ECS-3953M-1000-BN-TR 100 MHz surface
mount oscillator. It can be an input to U16.
U27 uses the DAC_A clock selected by J35 and
inputs it to U25, and uses the DAC_B clock
selected by J34 and inputs it to U30.
U29 uses the ADC_A clock selected by J37 and
inputs it to U26.
U28 uses the ADC_B clock selected by J36 and
inputs it to U31.
2–57
2–57
2–58
2–62
2–64
2–64
2–17
2–22
2–22
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August 2006Cyclone II DSP Development Board
Components & Interfaces
Table 2–1. Cyclone II DSP Development Board Components & Interfaces (Part 5 of 5)
Board ReferenceNameDescriptionPage
Powe r S up ply2–65
J1DC power jack9-20 V DC power source.
U13, U14, U15, U18, U19 Voltage limiter
switches
U2, U7, U8, U9, U10,
U23, U24
J2, J3, J4, J5, J6, J39,
J40, J41, J42
On-board power
regulators
Power plane
connectors
For information on powering up and testing the
Cyclone II DSP development board, see
“Cyclone II DSP Development Board Power-Up”
on page 2–65. For isolating and testing the
power planes, see “Bench Power Supplies
Using Banana Jacks” on page 2–67.
10-bit, 2-port bus switch.2–66
Seven voltage regulators on the Cyclone II DSP
development board.
Connectors for bench power supplies.2–69
2–65
2–66
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Cyclone II DSP Development BoardAugust 2006
Cyclone II DSP Development Board Components
Featured Device
fFor details about configuring the EP2C70 FPGA, see the Getting Started
The DSP Development Kit, Cyclone II Edition features the EP2C70F672
®
FPGA (U12) in a 672-pin FineLine BGA
package. Table 2–2 lists the
“Power Switch (SW1)” on page 2–57features of this device.
Table 2–2. Cyclone II EP2C70F672 Features
FeatureValue
Embedded 18x18 multipliers150
Logic Elements (LEs)68,416
M4K RAM blocks (4 Kbits + 512 parity bits)250
Maximum differential channels262
PLLs4 PLLs
Total RAM bits1,152,000
User I/O pins422
You can configure the FPGA in one of two ways:
■Use Quartus II to program a SRAM Object file (SOF) file directly into
the FPGA via the JTAG connector.
chapter in the DSP Development Kit, Cyclone II Edition Getting Started User Guide.
■Use Quartus II to load a design into the EPCS64 device via the ASI
connector and then cycle power to load the design from the EPCS64
device into the FPGA.
There are two EPCS64 devices, J29 determines which EPCS64 device
loads the FPGA. Refer to “EPCS64 Flash Memory Devices (U17,
U36)” on page 2–38 for more information.
User Interfaces
This section describes the user interfaces, which consist of LEDs,
switches, push-buttons, seven-segment display, line in, line out, audio
and headphone jacks, VGA, D/A converter, and A/D converter.
Altera Corporation Reference Manual2–9
August 2006Cyclone II DSP Development Board
User Interfaces
User-Defined LEDs (D2 Through D9)
The Cyclone II DSP development board provides eight user-defined
LEDs. D2 through D9 are connected to general purpose I/O pins on the
EP2C70 FPGA as listed in Table 2–3. When the EP2C70 FPGA drives logic
0, the corresponding LED turns on.
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Cyclone II DSP Development BoardAugust 2006
D9
Cyclone II DSP Development Board Components
User Defined DIP Switch (S1)
S1 is a user-defined octal DIP switch available for general-purpose use. It
must be defined by the user before it can be used. In the open position,
the selected signal is driven to logic 1. In the closed position, the selected
signal is driven to logic 0. Table 2–4 lists the pin-outs of the user DIP
switch. Figure 2–4 shows the switch labels on the switch, the labels on the
printed circuit board (PCB), and shows the open and closed switch
positions.
Altera Corporation Reference Manual2–11
August 2006Cyclone II DSP Development Board
User Interfaces
User-Defined Pushbuttons (SW2 Through SW5)
SW2-SW5 are user-defined momentary-contact push-button switches
used to provide stimulus to a user design on the Cyclone II DSP
development board. Each push-button is connected to the EP2C70
general-purpose I/O pin as listed in Table 2–5. When the switch is
pressed and held down, the device pin is set to logic 0, when the switch
is released, the device pin is set to logic 1. Figure 2–5 shows the
push-buttons.
2–12Reference ManualAltera Corporation
Cyclone II DSP Development BoardAugust 2006
SW3
PB2
SW4
PB1
SW5
PB0
Cyclone II DSP Development Board Components
Seven-Segment Display (U32,U33)
U32 and U33 are dual user defined, seven-segment displays on the
Cyclone II DSP development board. Each segment is individually
controlled by a general purpose I/O pin. When the EP2C70 FPGA pin
drives logic 0, the corresponding segment turns on. Table 2–6 lists the
seven-segment display pin-outs. Figure Figure 2–6 shows the name of
each segment.
Altera Corporation Reference Manual2–13
August 2006Cyclone II DSP Development Board
DP
CE
D
DP
User Interfaces
Audio CODEC Converter (U11)
The Cyclone II DSP development board contains three stereo jack
connectors, which provide one stereo output, one stereo input, and one
amplified stereo headphone output. The stereo jacks are driven by a
stereo audio CODEC running at 8-96 kHz. Table 2–7 lists the audio
CODEC references.
Table 2–7. Audio CODEC Reference
ItemDescription
Board referenceU11
Part numberTLV320AIC23
Device descriptionStereo Audio CODEC, 8-96 kHz
ManufacturerTexas Instruments
Manufacturer web sitewww.ti.com
Table 2–8 lists the TI TLV320AIC23 audio CODEC pin-outs.
Table 2–8. TI TLV320AIC23 Audio CODEC Pin-Outs
Schematic Signal Name
AUDIO_BCLK3F3
AUDIO_CLK25AB3
AUDIO_CSN21AC25
AUDIO_DIN4J21
AUDIO_DOUT6B13
AUDIO_LRCIN5W4
AUDIO_LRCOUT7AB2
AUDIO_MODE22AA2
AUDIO_SCLK24R4
AUDIO_SDIN23AD2
Audio CODEC (U11) Pin
Number
Cyclone II (U12) Pin
Number
Audio Jacks (J10, J14, J16)
The Cyclone II DSP development board contains the following audio
connectors:
■J10—an audio connector for line-in
■J14—an audio connector for line-out
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Cyclone II DSP Development BoardAugust 2006
Cyclone II DSP Development Board Components
■J16—an amplified audio connector output for headphones
These jacks connect to the TI TLV320AIC23 stereo audio CODEC (U11),
which controls volume and balance levels and connections. See “Audio
CODEC Converter (U11)” on page 2–14.
VGA Output Connector (J21)
J21 is a standard DB-15 VGA video output connector. This connector
interfaces to the Fairchild FMS3818 Triple Video D/A Converter (U21) on
the EP2C70 FPGA. J21 allows video images to be displayed on VGA
monitors.
VGA Triple Video D/A Output Converter (U21)
The Cyclone II DSP development board contains a high density DB-15
connector (U21), which outputs VGA and a triple video D/A output
converter with the following features:
■3 x 8 bit, 180 megapixels per second
■±2.5% gain matching
■±0.5 LSB linearity error
■Internal bandgap voltage reference
■Low glitch energy
■One 3.3-V power supply
Table 2–9 lists the VGA triple video D/A output converter device
reference.
Table 2–9. VGA Triple Video D/A Output Converter Device Reference
ItemDescription
Board referenceU21
Part number FMS3818
Device descriptionTriple Video D/A Converter, 3 x 8 bit, 180 Ms/s
Voltage3.3 V
ManufacturerFairchild Semiconductor
Manufacturer web sitewww.fairchildsemi.com
Altera Corporation Reference Manual2–15
August 2006Cyclone II DSP Development Board
User Interfaces
Table 2–10 lists the VGA triple video D/A output converter pin-outs
Table 2–10. VGA Triple Video D/A Output Converter Pin-Outs (Part 1 of 2) Note (1)
Schematic Signal NameVGA (U21) Pin NumberCyclone II (U12) Pin Number
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Cyclone II DSP Development BoardAugust 2006
Cyclone II DSP Development Board Components
Table 2–10. VGA Triple Video D/A Output Converter Pin-Outs (Part 2 of 2) Note (1)
Schematic Signal NameVGA (U21) Pin NumberCyclone II (U12) Pin Number
VGA_RED33
VGA_SYNCN11AE2
Note to Table 2–10:
(1) Blank cells indicate no connection.
D/A Converter SMA Connector (J31 & J43)
J31 (channel A) and J43 (channel B) are standard through-hole SMA
connectors used to interface the TI DAC904E D/A converter with SMA
cables.
D/A Converter Clock Buffer (U27 & 30)
For channel A, U27 provides the selected D/A clock to U25. For channel
B, U27 provides the selected D/A clock to U30.For more information see
“D/A Converter (U25 & U30)” on page 2–17.
D/A Converter (U25 & U30)
The D/A converter (U25 for channel A and U30 for channel B) on the
Cyclone II DSP development board provides 14-bit resolution and
produces samples at rates up to 165 MSPS. It is a high-speed TI DAC904E
D/A converter and is set up to drive a differential-to-single output
through a transformer. The output is transformer coupled and can be
found on the SMA connector (J31 for channel A, J43 for channel B). The
output of the TI DAC904E D/A converter is set to the maximum output
current of 20 mA. The signal-to-noise ratio for the system is 70 dB for
output signals from 1 MHz to the Nyquist frequency of the converter.
1The SLP-50 anti-aliasing filter from Mini-Circuits provides a
55 MHz cutoff frequency. To use the anti-aliasing filter, connect
the filter to one end of the SMA cable. You can perform an
external loopback from the SMA D/A converters to the SMA
A/D converters using the filter and cable assembly. If the cutoff
frequency must be lower than 55 MHz, other filters may be
used. See the Connecting the Cables to the Board & PC section in the
DSP Development Kit, Cyclone II Edition Getting Started User
Guide.
Altera Corporation Reference Manual2–17
August 2006Cyclone II DSP Development Board
User Interfaces
Table 2–11 lists the D/A converter reference for channels A and B.
Table 2–11. D/A Converter Reference (Channels A & B)
ItemDescription
Board referenceU25 (channel A), U30 (channel B)
Part numberDAC904E
Device description14-bit 165 MSPS D/A converter
ManufacturerTexas Instruments
Manufacturer web sitewww.ti.com
D/A Converter Clocks
Figure 2–7 shows the components involved in selecting the clock signal to
be sent to the TI DAC0904E (U25 for channel A, U30 for channel B). J35
(channel A) or J34 (channel B) selects the D/A clock from the OSC clock,
the FPGA clock, or the SMA clock (J26). The selected D/A clock passes
from J35 through a simple clock buffer (U27), which provides the clock
signal to the TI DAC904E.
Figure 2–7. TI DAC904E D/A Converter Clocking Options
95.3
143
95.3
143
FPGA_TO_DAC_CLK
J35 (Channel A)
or J34 (Channel B)
DAC Clock
Select
SMA_TO_DAC_CLK
50
U27
DAC Clock
Buffer
33
33
U25 (Channel A)
TI DAC904E
U30 (Channel B)
TI DAC904E
Custom Clock (J20)
On-Board Clock (U20)
External Clock SMA (J17)
CLKIN_TOP
J18
DAC External Clock SMA (J26)
U16
Clock
Buffer
33
33
33
CLKIN_BOT
CLK_OSC_DACA
U12
EP2C35
Refer to “Clock Circuitry” on page 2–59 for information on clock source selection.
2–18Reference ManualAltera Corporation
Cyclone II DSP Development BoardAugust 2006
Cyclone II DSP Development Board Components
Table 2–12 lists the J35 jumper settings used to select the D/A clock.
A/D Converter Data Format Select Jumper (J30 & J38)
The Data Format Select (DFS) jumper is used to select one of four data
output formats from the TI ADS5520 A/D converter. Table 2–16 on
page 2–22 lists the data output formats and how to select a format with
J30 (channel A) or J38 (channel B).
A/D Converter SMA Connector (J32 & J44)
J32 (channel A) and J44 (channel B) are standard through-hole SMA
connectors used to interface the TI ADS5520 A/D input converter with
SMA cables.
Altera Corporation Reference Manual2–21
August 2006Cyclone II DSP Development Board
User Interfaces
A/D Converter Clock Buffer (U29 & U28)
U29 provides the selected A/D clock to U26 for channel A. U28 provides
the selected A/D clock to U31 for channel B. For more information, see
“A/D Converter (U26 & U31)” on page 2–22.
A/D Converter (U26 & U31)
The Cyclone II DSP development board contains one TI ADS5520 12-bit
125 MSPS A/D converter. The device is designed for high speed and
high-performance applications.
The input to this A/D converter is transformer-coupled in order to create
a balanced input. To maximize performance, two transformers (T2, T3)
are used in series. The signal-to-noise ratio for the system is 70 dB for
input signals from 1 MHz to the Nyquist frequency of the converter. The
maximum differential input voltage to the converter is 2.2 V
Table 2–15 lists the A/D converter references.
Table 2–15. A/D Converter Reference
ItemDescription
Board referenceU26 (channel A) and U31 (channel B)
Part numberADS5520
Device description12-bit 125 MSPS A/D converter
ManufacturerTexas Instruments
Manufacturer web sitewww.ti.com
.
PP
The data output format from the A/D converter is selectable through J30
(channel A) or J38 (channel B). Table 2–16 lists the available data output
format options and how to set them. Figure 2–9 shows the pin settings for
J30 and J38.
Table 2–16. TI ADS5520 A/D Converter (J26) Data Output Format Select
Jumper (J30 & J38)
Setting
Pins 1 and 2Two’s ComplementData valid on falling edge
Pins 3 and 4Straight BinaryData valid on falling edge
Pins 5 and 6Two’s ComplementData valid on rising edge
Pins 7 and 8Straight BinaryData valid on rising edge
2–22Reference ManualAltera Corporation
Cyclone II DSP Development BoardAugust 2006
Data FormatClock Output Polarity
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