DAC3151EVM

User's Guide SLUUAN8 – July 2013 DAC31x1EVM User Guide This document is intended to serve as a basic user’s guide for the DAC31x1 EVM. The EVM provides a basic platform to evaluate the DAC31x1, which is a 500 MSPS, high speed digital-to-analog converter. The DAC3171 is a single-channel DAC with 14-bit LVDS input. The DAC3171 is pin compatible with the single-channel, 12- and 10-bit, 500 MSPS digital-to-analog converter, DAC3161 and DAC3151. The DAC3174EVM GUI is used for the DAC31x1EVM. The EVM includes the CDCE62005 clocking source which provides the clocks required for the DAC and the pattern generator. 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 3 Contents EVM Block Diagram ........................................................................................................ Software Control ............................................................................................................ 2.1 Installation Instructions ............................................................................................ 2.2 Software Operation ................................................................................................ Basic Test Procedure ....................................................................................................... 3.1 Test Block Diagram ................................................................................................ 3.2 Test Set-up Connection ........................................................................................... 3.3 TSW1400 Quick Start Operation ................................................................................. 3.4 DAC3174 Software Quick Start Guide .......................................................................... 3.5 DAC3171 Output Performance for WCDMA ................................................................... 2 2 2 2 6 6 6 6 8 9 List of Figures 1 EVM Block Diagram ........................................................................................................ 2 2 Input Control Options ....................................................................................................... 3 3 Digital Block Options ....................................................................................................... 3 4 Output Control Options ..................................................................................................... 4 5 CDCE62005 Tab Configured for DAC31x1.............................................................................. 5 6 Test Setup Block Diagram ................................................................................................. 6 7 TSW1400 Two-Tone Programming GUI ................................................................................. 7 8 Captured Two-Tone from Spectrum Analyzer........................................................................... 8 9 DAC3171 WCDMA 5-MHz Output (IF = 70 MHz) ...................................................................... 9 10 DAC3171 WCDMA 4 Carriers 20-MHz Output (IF = 70 MHz) ........................................................ 9 SLUUAN8 – July 2013 Submit Documentation Feedback DAC31x1EVM User Guide Copyright © 2013, Texas Instruments Incorporated 1 EVM Block Diagram 1 www.ti.com EVM Block Diagram Figure 1 shows the configuration of the EVM with the TSW1400 used for the pattern generation. J9 Max 500MHz LVCMOS PRI U3 FPGA CLK LVDS CDCE62005 U2 U1 OSTR_CLK LVPECL DACCLK LVPECL IOUTA DATA/DATACLK LVDS Ch A J7 DAC31x1 Figure 1. EVM Block Diagram 2 Software Control 2.1 Installation Instructions The following steps ensure proper installation of the DAC3174 software: • 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 2.2 Software Operation The software allows programming control of the DAC device and the CDCE device. The front panel provides a tab for full programming of each device. The GUI tabs provides more convenient and simplified interface to the most-used registers of each device. 2 DAC31x1EVM User Guide SLUUAN8 – July 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Software Control www.ti.com 2.2.1 Input Control Options Figure 2 illustrates the input control options. Figure 2. Input Control Options • • • • 2.2.2 FIFO: Allows the configuration of the FIFO and FIFO sync sources SIF Control: Provides control of the Serial Interface (3-wires or 4-wires) and Serial Interface Sync (SIF Sync) LVDS Delay: Provides internal delay of either the LVDS data or LVDS data clock to help meet the input setup and input hold time Input Format: Provides control of the input data format (that is, 2’s complement or offset binary) Digital Block Options Figure 3 illustrates the digital block options. Figure 3. Digital Block Options SLUUAN8 – July 2013 Submit Documentation Feedback DAC31x1EVM User Guide Copyright © 2013, Texas Instruments Incorporated 3 Software Control • • 2.2.3 www.ti.com 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 the DC offset to minimize the LO feedthrough of the modulator output. Writing the register for Offset B generates an autosync in the QMC OFFSET block. Output Control Options Figure 4 illustrates the output control options. Figure 4. Output Control Options • • • 4 Output: Allows the configuration of reference, output polarity, and output delay DAC Gain: Configures the full-scale DAC current and DAC31x1 mode – DAC Gain = 15 for 20 mA full-scale current – DAC31x1 = DDAC Output Shutoff On: Allows outputs to shut-off when an alarm event occurs DAC31x1EVM User Guide SLUUAN8 – July 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Software Control www.ti.com 2.2.4 CDCE62005 Figure 5 shows the CDCE62005 tab, configured for the DAC31x1. Figure 5. CDCE62005 Tab Configured for DAC31x1 Clock frequency control is determined by register values in the CDCE62005 tab. Please refer to the CDCE62005 datasheet (SCAS862) for detailed explanations of the register configuration to change the clock frequency. The following CDCE62005 outputs are critical to proper operation of the DAC31x1: 1. OUTPUT1_DAC_CLK: DAC31x1 Sampling clock. 2. OUTPUT3_TSW1400_CLK: TSW1400 FPGA clock. To configure the CDCE62005 registers, open the DAC3174 GUI, click the Load button and open the file “dac3174_reg.txt” file. This should automatically configure the CDCE62005 registers. 2.2.5 Register Control Send: Sends the register configuration to all devices Read: Reads the register configuration from the DAC31x1 device Load: Load a register file for all devices. Sample configuration files for common frequency plans are located in the install directory. – Select the Load button – Double click on the data folder – Double click on the desired register file – Click Send All to ensure all of 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: Reset the board and click the Reset USB button on the GUI after every power cycle. • Exit: Stops the program SLUUAN8 – July 2013 Submit Documentation Feedback DAC31x1EVM User Guide Copyright © 2013, Texas Instruments Incorporated 5 Basic Test Procedure 3 www.ti.com Basic Test Procedure 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 DAC31x1 with the TSW1400 pattern generation card is shown in Figure 6. PC Signal Generator Mini-USB Mini-USB CLK J9 J5 LVDS TSW1400 J2 J13 J4 DAC31x1EVM J15 IF J12 J4 +5V +6V Spectrum Analyzer Figure 6. Test Setup Block Diagram 3.2 Test Set-up Connection • • 3.3 TSW1400 Pattern Generator 1. Connect a 5-V power supply to J12, the 5V_IN jack of the TSW1400 EVM. 2. Connect the PC's USB port to J5, mini-USB port of the TSW1400. DAC31x1 EVM 1. Connect the J13 connector of the DAC31x1 EVM to the J4 connector of the TSW1400 EVM. 2. Connect 6 V to J3, the power in jack of the DAC31x1 EVM. 3. Connect the PC’s USB port to J2, the USB port of the DAC31x1 EVM. The cable should be 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 DAC31x1 EVM. 5. Connect the RF output port of J15 to the spectrum analyzer. TSW1400 Quick Start Operation Please reference the TSW1400 user’s guide (SLWU079) for more detailed explanations of the TSW1400 set-up and operation. This document assumes the TSW1400 software is installed and functioning properly. Two-tone test configuration from High Speed Data Converter Pro: • Enter Tone BW. 5M for two-tone case means tone-spacing. For single-tone, Tone BW can be ‘1’ • Enter desired number of tones • Select Tone Center for the baseband shifting • Select Tone selection. For a complex pattern select I/Q and select Real for real pattern. • Enter Data Rate (SPS) for the DAC sampling frequency • Select DAC Option between 2’s Complement and Offset binary 6 DAC31x1EVM User Guide SLUUAN8 – July 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Basic Test Procedure www.ti.com Figure 7. TSW1400 Two-Tone Programming GUI SLUUAN8 – July 2013 Submit Documentation Feedback DAC31x1EVM User Guide Copyright © 2013, Texas Instruments Incorporated 7 Basic Test Procedure www.ti.com Figure 8. Captured Two-Tone from Spectrum Analyzer 3.4 DAC3174 Software Quick Start Guide The following steps provide a quick start guide to the DAC3174 software: • Provide the clock input 491.52 MHz at 1.5 Vrms at J9 SMA connector of the DAC31x1 EVM • Turn on power to the board and press the reset button on the EVM • Press the Reset USB Port button in the GUI and verify USB communication • Switch to the INPUT tab of the GUI • Press the RESET tab until the USB is CONNECTED • Click Load, browse to the installation folder and load the 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 IF outputs of the DAC EVM (J7) 8 DAC31x1EVM User Guide SLUUAN8 – July 2013 Submit Documentation Feedback Copyright © 2013, Texas Instruments Incorporated Basic Test Procedure www.ti.com 3.5 DAC3171 Output Performance for WCDMA 5 MHz of WCDMA signal is measured for Adjacent Channel Power Ratio (ACPR) performance, as shown in Figure 9. Measured ACPR shows –76.37 dB and –76.09 dB at the adjacent channel and –80.33 dB and –79.86 dB at the alternate channel. Figure 9. DAC3171 WCDMA 5-MHz Output (IF = 70 MHz) 20 MHz of WCDMA 4 carrier signal is measured for ACPR performance as shown in Figure 10. Measured ACPR shows –71.24 dB and –71.17 dB at the adjacent channel and –72.04 dB and –71.67 dB at the alternate channel. Figure 10. DAC3171 WCDMA 4 Carriers 20-MHz Output (IF = 70 MHz) SLUUAN8 – July 2013 Submit Documentation Feedback DAC31x1EVM User Guide Copyright © 2013, Texas Instruments Incorporated 9 EVALUATION BOARD/KIT/MODULE (EVM) ADDITIONAL TERMS Texas Instruments (TI) provides the enclosed Evaluation Board/Kit/Module (EVM) under the following conditions: The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user indemnifies TI from all claims arising from the handling or use of the goods. Should this evaluation board/kit not meet the specifications indicated in the User’s Guide, the board/kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING LIMITED WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY 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. 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