Texas instruments LM97600RB User Manual

July 27, 2012

Revision 2.1

LM97600RB

Reference Board Users’ Guide

Table of Contents

Overview Features Packing List References Board Overview Quick Start Installing the WaveVision 5 Software Installing the LM97600RB Hardware

LM97600RB User’s Guide

Launching the WaveVision 5 Software WaveVision 5 – User Interface Overview System / Device Configuration Data Capturing Secondary Panel Description System Block Diagram System Description Electrical Specification

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LM97600RB User’s Guide

Overview

The LM97600RB demonstrates a high-performance signal acquisition sub-system that provides an average output word size of 7.6 bits, and corresponding SNR and dynamic range on one to four channels at signal frequencies in excess of 1.0 GHz. Sampling rates of up to 1.25 GSPS on 4 inputs, 2.5 GSPS on 2 inputs, or 5.0 GSPS on 1 input are possible. The board showcases the following Texas Instruments devices:

• LM97600 analog-to-digital converter

• LMX2531LQ2570E clock synthesizer

• LP3878MR-ADJ linear LDO regulators

• LM2738YMY switching regulators

In addition, the board also employs the Xilinx XC5VFX70T-3FF1136C Virtex-5 FPGA for the critical function of capturing the high-speed digital data sourced by the ADC.

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Features

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Demonstrates the LM97600's typical dynamic performance – see the datasheet for full details.

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Quad channel sample rates of up to 1.25 GS/s (limited by the ADC specifications and the FPGA capture limitations)

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Dual channel sample rates of up to 2.5 GS/s (limited by the ADC specifications and the FPGA capture limitations)

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Single channel sample rates of up to 5.0 GS/s (limited by the ADC specifications and the FPGA capture limitations)

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Large on-board memory for deep captures

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On-board LMX2531 based clock circuit with a connector for a selectable external clock

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A complete high-performance low-noise power management section for the ADC, clock circuit, FPGA and USB controller

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Single +12V power adapter input

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Simplicity and performance of USB 2.0 connection to the PC

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Functions with TI's latest WaveVision 5 signal-path control and analysis software

LM97600RB User’s Guide

Packing List

The LM97600RB kit consists of the following components:

• LM97600RB Board

• Documentation on CD Including

o LM97600RB Users Guide (this document) o Wavevision 5 Software o LM97600RB schematic & layout o LM97600RB bill of materials o FPGA source code

Hardware Kit Including

o 110V-240V AC to +12V DC Power Adapter o USB cable o 4 – DC blocks o 1 – Anaren balun board (useful bandwidth of 400 MHz to 3 GHz) o 1 – Mini-Circuits balun board (useful bandwidth of 4.5 MHz to 3 GHz) o 4 – 6” SMA cables

References

• *LM97600 datasheet

• *LMX2531 datasheet

*Note: Please refer to www.ti.com

for the latest edition of all datasheets / application notes.

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Board Overview

LM97600RB User’s Guide

USB

Controller

Power

+12V

Power

LEDs

LM97600

Ch. 2 Input

Ch. 4 Input

Ch. 3 Input

Ch. 1 Input

SRAMx4

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FPGA (Xilinx

SerDes

Ref Clock Input

Figure 1: LM97600RB Board Layout

Ext Clock

LMX2531

Int Clock

LM97600RB User’s Guide

Figure 2: Jumpers and LEDs

Installed Jumpers

Shorting jacks should be installed in the following locations for the default board configuration:

• PWR‐5

• SPI_EN

• PWR‐5R

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LM97600RB User’s Guide

Quick Start

This section will aid in bringing up the board for the first time as well as a brief tutorial on the WaveVision 5 (WV5) software. Further description of the Reference Board is in subsequent sections of this document. The software is further described in the WaveVision 5 Users' Guide or the HELP function within the software. The LM97600 and LMX2531 datasheets should be consulted for detailed understanding of device functionality.

The user is advised to construct a lab setup as close to the one shown in Figure 3 as possible. This setup, along with the board and software configuration described below, is what was used to test the reference board at TI’s lab. The objective is to assure that the user can achieve the same performance as that recorded at TI’s lab prior to board shipment.

Vin

from

USB

+12V DC

Filter

Blocks

BALUN

Optional:

REF_CLK

Optional:

ADC_CLK

from

Filter

BALUN

Figure 3: Recommended lab setup for on-board clock mode. A filter may not be necessary on

the clock if the generator is very clean (beyond -80dBm SFDR).

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LM97600RB User’s Guide

Installing the WaveVision 5 Software

(Note: The WaveVision 5 software requires Windows XP 32-bit operating system)

1. Insert the included WaveVision 5 CD-ROM into the computer CD drive.

2. Locate the “install.bat” file in the Software Installation folder on the CD-ROM. Double click this file to install the software.

3. Follow the on-screen instructions to complete the installation using the default file/folder locations.

Installing the LM97600RB Hardware

1. Place the LM97600RB Reference Board on a clean, static-free surface.

2. Make sure the board's jumpers are configured as shown in Figure 2:

3. Connect the enclosed +12V DC power adapter to the power jack. Connect the other side of the power supply to an AC outlet (100-240 VAC, 50-60 Hz).

4. Connect the input signal generator, the band-pass filter, the balun and the DC blocks to the LM97600RB Reference Board's input connectors. Set the signal generator at one of the frequencies and signal levels stated in the reference performance report. Always use high-quality RF SMA cables for optimum performance.

Do not overdrive the signal and clock inputs as the ADC may be damaged. Refer to the

Electrical Specification section of the datasheet for the voltage tolerance of these inputs. Including insertion loss from filters, baluns, cables, DC blocks, etc. input power should not exceed operating limits as found in the datasheet.

5. In the TI lab, the following (or equivalent performance) equipment are used to test the board. It is essential that the customer use signal generators, filters, DC blocks and a balun of equivalent or better performance.

Rohde & Schwarz SML03, SME-03 or SMA-100 signal generator Filters - Trilithic 5VF 5% tunable bandpass filter or other fixed frequency bandpass

filter of equivalent performance Balun – Mini-Circuits or Anaren Balun Board

DC blocks – Mini Circuits BLK-89 S+

Note: The board comes equipped with DC-blocks, to be applied to the signal input connectors. These must be used at all times - that is, the channel being used must be connected through dcblocks if the ADC is configured for ac-coupled operation (as shipped). This is graphically illustrated in Figure 3.

6. Turn on the rocker power switch. Verify that the green LEDs (labeled D1203 and D1303) are illuminated.

7. Connect the supplied USB 2.0 cable from the PC USB port to the LM97600RB USB jack.

8. At this point, the driver for the board will be installed. Follow the instructions to install the software automatically, but without connecting to the internet. Once the driver has been successfully installed, proceed to the next step.

Launch the WaveVision 5 Software.

Start the WaveVision 5 software on your computer by selecting the desktop icon “WaveVision 5” or by clicking on the Start button, and selecting

Programs -> WaveVision 5 -> WaveVision 5

The software will automatically detect the board and load the appropriate software profile and will proceed to download the controller firmware and FPGA code onto the reference board. Be patient, as it takes approximately 20-30 seconds to load the FPGA code. As an alternative, the icon on the desktop

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can be used to launch WaveVision 5. Once the FPGA is loaded and configured, additional LEDs will illuminate, and the WaveVision 5 user interface will appear on the computer screen.

The status LED’s should take on the following states when the system is ready for an acquisition:

LM97600RB User’s Guide

Meaning of the status LED’s:

D1203 On – 12V power applied, and SW1 on D1303 On – Digital Power (SPIO_PWR_EN) Active D1202 On – ADC Power (3V3_MEZ) Active D1207 On – FPGA Initialized D400 Blinking – Microcontroller Ready (will blink more slowly during repetitive captures)

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WaveVision 5 - User Interface Overview

LM97600RB User’s Guide

Figure 4: WaveVision 5 Example Window

Figure 4 above shows the WV5 user interface panel (GUI). This is the top level interface panel. It is arranged in such a way that the plot is always in the middle. There are tabs arranged on each side of the window to give the user additional information or control of features.

The tabs available on the left side access panels that are pertinent to the current plot window - such as channel selection, grid selection, FFT Readouts, and FFT controls.

The right side panels allow the user to take control of the hardware. These include the Signal Source, Signal Control and Registers panels (the most relevant for this board).

In addition, a small FFT parameter summary box can be displayed by pressing CTL-R. For more details on the general operation and use of WaveVision 5, please refer to the WaveVision 5

Users Guide.

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LM97600RB User’s Guide

System / Device Configuration

Prior to capturing data, confirm that the board is in the "ECE (Extended Control Enable)" mode, The ECE jumper is located in the ADC pin control jumper area as shown in Figure 2. The board should be sent with this jumper in place. This means that the ADC will be controlled through the SPI interface and not with jumpers driving the control pins. This allows the user to control the ADC's behavior through the WaveVision 5 Registers panel.

Figure 5: WaveVision 5 overview of control buttons

Figure 6: WaveVision 5 main window command buttons

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LM97600RB User’s Guide

Main Panel

The main menu bar of the WaveVision 5 software has several control buttons as shown in Figures 5 and 6, which may be used to perform most tasks with a button click.

1 - Load Plot

A new plot window is created and the Plot Load dialog is displayed. The selected plot file is loaded into the new window.

2 - Import Data

Clicking this button creates a new time-domain plot and opens the Import Data dialog. Data may be imported from WaveVision 4 data files as well as from ASCII data files created by other programs.

3 - Create a New Time Domain Plot

Clicking this button creates a new time-domain plot. The plot will contain no data, but is available as a data destination.

4 - Create a New Hardware Histogram Plot

Clicking this button creates a new hardware histogram plot. Hardware histograms are available only in conjunction with evaluation boards which can gather histogram data internally. This button is enabled only when an evaluation board which supports hardware histograms is attached.

5 - Acquire Data

Click this button to acquire data to the active plot. If you have created more than one plot, the Active plot has a highlighted title bar.

6 - Continuous Acquisition

This button is a toggle - when it is pressed, data is acquired continuously, one buffer after another as fast as the hardware can go; when pressed again data acquisition stops. When in continuous acquisition mode, acquisition may be started and stopped using the Acquire button without leaving the continuous acquisition mode.

7 - FFT Averaging

This button is also a toggle - when it is pressed, FFT's are averaged. The number of buffers to be averaged is specified in the hardware section of the Signal Sources tab.

Please refer to the WaveVision 5 Users Guide for more information.

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