DAC31x4 EVM User's Guide User's Guide

DAC31x4 EVM User's Guide User's Guide
User's Guide
SLAU466A – November 2012 – Revised June 2013
DAC31x4 EVM User's Guide
This document is intended to serve as a basic user’s guide for the DAC31x4 EVM Revision A. The EVM
provides a basic platform to evaluate the DAC31x4, which is a 500 MSPS high-speed digital-to-analog
converter. The DAC3174 is a dual-channel DAC with 14-bit LVDS input. DAC3174 is pin compatible with
the dual-channel, 12-/10-bit, 500 MSPS digital-to-analog converter, DAC3164 and DAC3154. The
DAC3174 EVM GUI can be used for DAC31x4 EVM.
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Contents
Introduction .................................................................................................................. 2
1.1
Overview ............................................................................................................ 2
1.2
EVM Block Diagram ............................................................................................... 2
Software Control ............................................................................................................ 3
2.1
Installation Instructions ............................................................................................ 3
2.2
Software Operation ................................................................................................ 3
Basic Test Procedure with TSW1400 .................................................................................... 7
3.1
Test Block Diagram ................................................................................................ 7
3.2
Test Set-up Connection ........................................................................................... 7
3.3
TSW1400 Quick Start Operation ................................................................................. 8
3.4
DAC31x4 Software Quick-Start Guide .......................................................................... 9
3.5
DAC3174 Output Performance for WCDMA and LTE ....................................................... 10
List of Figures
1
EVM Block Diagram ........................................................................................................ 2
2
Input Control Options ....................................................................................................... 3
3
Digital Filtering Options
4
Output Control Options ..................................................................................................... 4
5
CDCE62005 Tab Configured for DAC3174
6
Test Setup Block Diagram ................................................................................................. 7
7
TSW1400 Two-Tone Programming GUI ................................................................................. 8
8
Captured Two-Tone from Spectrum Analyzer........................................................................... 9
9
DAC3174 and TRF3705 LTE, 10-MHz Output (Baseband = 0 MHz, LO = 885 MHz) ........................... 10
10
DAC3174 and TRF3705 WCDMA, 5-MHz Output (Baseband = 30 MHz, LO = 885 MHz) ...................... 11
....................................................................................................
.............................................................................
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1
Introduction
1
Introduction
1.1
Overview
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The EVM includes the CDCE62005 clocking source which provides the clocks required for the DAC and
the pattern generator. The on-board TRF3705-15 modulator provides on-board IF-to-RF up-conversion for
basic transmitter evaluation. This EVM is ideally suited for mating with the TSW1400 pattern generation
card for evaluating WCDMA, LTE, or other high-performance modulation schemes.
1.2
EVM Block Diagram
Figure 1 shows the configuration of the EVM with the TSW1400 used for pattern generation.
Figure 1. EVM Block Diagram
2
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Software Control
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2
Software Control
2.1
Installation Instructions
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•
•
•
•
2.2
Open the folder named DAC3174_Installer_vxpx (xpx represents the latest version)
Run Setup.exe
Follow the on-screen instructions
Once installed, launch by clicking on the DAC3174_GUI_vxpx program in Start → Texas Instruments
DACs
When plugging in the USB cable for the first time, you are prompted to install the USB drivers.
– When a pop-up screen opens, select Continue Downloading
– Follow the on-screen instructions to install the USB drivers
– If needed, you can access the drivers directly in the install directory, C:\Program Files (x86)\Texas
Instruments\DAC3174 for Windows® 7 and C:\Program Files\Texas Instruments\DAC3174 for
Windows XP.
Software Operation
The software allows programming control of the DAC and CDCE devices. The front panel provides a tab
for full programming of each. The GUI tabs provide a more convenient and simplified interface to the
most-used registers of each device.
2.2.1
Input Control Options
Figure 2. Input Control Options
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•
•
•
FIFO: allows the configuration of the FIFO and FIFO synchronization (sync) sources.
LVDS delay: provides internal delay of either the LVDS data or LVDS data clock to help meet the input
setup and hold time.
SIF Control: provides control of the Serial Interface (3-wires or 4-wires) and Serial Interface Sync (SIF
Sync).
Input Format: provides control of the input data format (that is, 2s complement or offset binary).
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Software Control
2.2.2
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Digital Block Options
Figure 3. Digital Filtering Options
•
•
2.2.3
Clock Receiver Sleep: allows the DAC clock receiver to be in sleep mode. The DAC has minimum
power consumption in this mode.
Offset Adjustment: allows adjustment of DC offset to minimize the LO feed-through of the modulator
output. Writing the register for Offset B causes an autosync generation in the QMOFFSET block.
Output Control Options
Figure 4. Output Control Options
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•
4
Output: allows the configuration of reference, output polarity, and output delay
DAC Gain: configures the full-scale DAC current and DAC3174 mode
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Software Control
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•
2.2.4
– DAC Gain = 15 for 20-mA full-scale current
– DAC3174 = DDAC
Output Shutoff On: allows outputs to shut-off when alarm event occurs
CDCE62005
Figure 5. CDCE62005 Tab Configured for DAC3174
Clock frequency control is determined by register values in the CDC tab. Please refer to the CDCE62005
datasheet for detailed explanations of the register configuration to change the clock frequency.
The following CDCE62005 outputs are critical to proper operation of the DAC3174:
• OUTPUT1_DAC_CLK: DAC3174 Sampling clock
• OUTPUT3_TSW1400_CLK: TSW1400 FPGA clock
Configure the CDCE62005 registers with the following steps:
1. Open the DAC3174 GUI
2. Click the Load Regs button
3. Open the dac3174_reg.txt file.
This automatically configures the CDCE62005 registers.
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Software Control
2.2.5
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Register Control
Send All: Sends the register configuration to all devices
Read All: Reads register configuration from the DAC3174 device
Load Regs: Load a register file for all devices. Sample configuration files for common frequency plans
are located in the install directory.
– Select Load Regs button
– Double click the data folder
– Double click the desired register file
– Clicking Send All ensures all the values are loaded properly
• Save Regs: Saves the register configuration for all devices
•
•
•
2.2.6
Miscellaneous Settings
• Reset USB: Toggle this button if the USB port is not responding. This generates a new USB handle
address.
NOTE: It is recommended to reset the board and select the Reset USB button after every power
cycle.
•
6
Exit: Stops the program
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Basic Test Procedure with TSW1400
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3
Basic Test Procedure with TSW1400
This section outlines the basic test procedure for testing the EVM.
3.1
Test Block Diagram
The test set-up for general testing of the DAC31x4 with the TSW1400 pattern generation card is shown in
Figure 6
Figure 6. Test Setup Block Diagram
3.2
Test Set-up Connection
•
•
TSW1400 Pattern Generator
1. Connect the 5-V power supply to J12, the 5V_IN jack of the TSW1400 EVM.
2. Connect the PC’s USB port to J5, the mini-USB port of the TSW1400.
DAC31x4 EVM
1. Connect the J13 connector of DAC31x4 EVM to the J4 connector of TSW1400 EVM.
2. Connect 6 V to J3, the power in jack of the DAC31x4 EVM.
3. Connect the PC’s USB port to J2, the USB port of the DAC31x4 EVM. Use a standard A to mini-B
connector cable.
4. Provide a 1.5-Vrms, 500-MHz max clock at J9, the CLKIN SMA port of the DAC31x4 EVM.
5. Provide 12-dBm maximum, 300-MHz to 4-GHz LO source at the J13 port of the DAC31x4 EVM.
This provides the LO source to the TRF3705-15 modulators.
6. Connect the RF output port of J15 to the spectrum analyzer.
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Basic Test Procedure with TSW1400
3.3
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TSW1400 Quick Start Operation
Please reference the TSW1400 user’s guide for more detailed explanations of the TSW1400 setup and
operation. This document assumes the TSW1400 software is installed and functioning properly.
Two-tone test configuration from High Speed Data Converter Pro (HSDCP) as illustrated in Figure 7:
• In the Tone BW section, entering 3M for the two-tone case means tone-spacing. For single-tone, Tone
BW can be 1.
• Enter the desired number of tones (#).
• Enter the value for the baseband shifting in the Tone Center.
• On Tone selection select I/Q for a complex pattern, and Real for a real pattern.
• Enter Data Rate (SPS) for the DAC sampling frequency.
• In the DAC Option selection, choose between 2’s Complement and Offset binary.
Figure 7. TSW1400 Two-Tone Programming GUI
8
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Basic Test Procedure with TSW1400
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3.4
DAC31x4 Software Quick-Start Guide
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•
•
•
•
•
•
Provide the clock input 491.52 MHz at 1.5 Vrms at J9 SMA connector of the DAC31x4 EVM
Provide the LO source of 885 MHz (12-dBm max) at either J13 SMA connector of the DAC31x4 EVM
Turn on the power to the board and press the reset button on the EVM
Press the Reset USB Port button in the GUI and verify the USB communication
Switch to the INPUT tab of the GUI
Click LOAD REGS, browse to the installation folder and load example file dac3174_reg.txt. This file
contains settings for DAC3174 running at 491.52 MSPS. Load this file and wait a couple of seconds for
the settings to go into effect.
Verify the spectrum using the Spectrum Analyzer at the two RF outputs of the DAC EVM (J15).
Ref
10 dBm
*Att
20 dB
*RBW 100 kHz
*VBW 1 MHz
*SWT 1 s
10
A
0
1 RM *
CLRWR
-10
-20
-30
-40
3DB
-50
-60
-70
-80
-90
Center 885 MHz
10 MHz/
Span 100 MHz
Date: 17.OCT.2012 09:27:03
Figure 8. Captured Two-Tone from Spectrum Analyzer
Figure 8 shows a captured two-tone from spectrum analyzer as illustrated configuration of TSW1400 GUI,
High Speed Data Converter Pro, in Figure 7. This two-tone is centered at 885 MHz as providing 885 MHz
of external LO from the signal generator.
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Basic Test Procedure with TSW1400
3.5
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DAC3174 Output Performance for WCDMA and LTE
10 MHz of LTE signal is measured for Adjacent Channel Power Ratio (ACPR) performance, as shown in
Figure 9. The specification of this pattern is based on 3GPP LTE FDD E-TM1.1 and Quadrature Phase
Shift Keying (QPSK) of the modulation scheme. Measured ACPR shows –72.80 dB and –72.18 dB at
adjacent channel and –74.73 dB and –74.83 dB at alternate channel.
Figure 9. DAC3174 and TRF3705 LTE, 10-MHz Output (Baseband = 0 MHz, LO = 885 MHz)
10
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Basic Test Procedure with TSW1400
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5 MHz of WCDMA signal is measured for ACPR performance as shown in Figure 10. The specification of
this pattern is based on 3GPP FDD and spread-spectrum modulation technique. Measured ACPR shows
–71.44 dB and –71.27 dB at adjacent channel and –73.87 dB and –74.37 dB at alternate channel.
Figure 10. DAC3174 and TRF3705 WCDMA, 5-MHz Output (Baseband = 30 MHz, LO = 885 MHz)
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DAC31x4 EVM User's Guide
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EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS
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For Feasibility Evaluation Only, in Laboratory/Development Environments. Unless otherwise indicated, this EVM is not a finished
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TI is not responsible or liable for any such statements.
Buyer acknowledges and agrees that it is solely responsible for compliance with all legal, regulatory and safety-related requirements
concerning its products, and any use of TI components in its applications, notwithstanding any applications-related information or support
that may be provided by TI. Buyer represents and agrees that it has all the necessary expertise to create and implement safeguards which
anticipate dangerous consequences of failures, monitor failures and their consequences, lessen the likelihood of failures that might cause
harm and take appropriate remedial actions. Buyer will fully indemnify TI and its representatives against any damages arising out of the use
of any TI components in safety-critical applications.
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requirements. Nonetheless, such components are subject to these terms.
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Products
Applications
Audio
www.ti.com/audio
Automotive and Transportation
www.ti.com/automotive
Amplifiers
amplifier.ti.com
Communications and Telecom
www.ti.com/communications
Data Converters
dataconverter.ti.com
Computers and Peripherals
www.ti.com/computers
DLP® Products
www.dlp.com
Consumer Electronics
www.ti.com/consumer-apps
DSP
dsp.ti.com
Energy and Lighting
www.ti.com/energy
Clocks and Timers
www.ti.com/clocks
Industrial
www.ti.com/industrial
Interface
interface.ti.com
Medical
www.ti.com/medical
Logic
logic.ti.com
Security
www.ti.com/security
Power Mgmt
power.ti.com
Space, Avionics and Defense
www.ti.com/space-avionics-defense
Microcontrollers
microcontroller.ti.com
Video and Imaging
www.ti.com/video
RFID
www.ti-rfid.com
OMAP Applications Processors
www.ti.com/omap
TI E2E Community
e2e.ti.com
Wireless Connectivity
www.ti.com/wirelessconnectivity
Mailing Address: Texas Instruments, Post Office Box 655303, Dallas, Texas 75265
Copyright © 2013, Texas Instruments Incorporated
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