Texas TSW1100 User manual

TSW1100 Data Capture Board
Quick Start Guide
August 2005
SLAU155

2 SLAU155 – August 2005

Contents
1 Overview ................................................................................................................... 5
2 Setup the TSW1100 .................................................................................................... 72.1 Connect to a Texas Instrument’s ADC EVM .................................................................... 72.2 Provide Power to the ADC EVM .................................................................................. 72.3 Providing Power to the TSW1100 ................................................................................ 72.4 Connecting to the USB ............................................................................................. 72.5 Launching the TSW1100 Software ............................................................................... 7
3 Capture the ADC Samples, Perform an FFT, and Plot the Results .................................... 93.1 Information ........................................................................................................... 93.2 Setting Up Remote Control of Instruments ...................................................................... 93.3 Select the ADC Under Evaluation ................................................................................ 93.4 Configure the Input Waveform (A
IN
) Conditions ................................................................ 93.5 Configure the ADC Sampling Frequency (F
S
) Conditions ..................................................... 93.6 Configure the TSW1100 Capture ................................................................................. 93.7 Acquire Data ....................................................................................................... 10
4 Performing a Dual Channel Capture ............................................................................ 114.1 Information ......................................................................................................... 114.2 Setting up Remote Control of Instruments ..................................................................... 114.3 Select the ADC Under Evaluation ............................................................................... 114.4 Configure the Input Waveform (A
IN
) Conditions ............................................................... 114.5 Configure the ADC Sampling Frequency (Fs) conditions .................................................... 114.6 Configure the TSW1100 Capture ............................................................................... 114.7 Acquire Data ....................................................................................................... 12
5 Saving and Recalling Data to a File ............................................................................ 135.1 Saving a Data Set ................................................................................................. 135.2 Retrieving a Saved Data Set .................................................................................... 135.3 Performing a Screen Capture.................................................................................... 13
6 Exiting the Program .................................................................................................. 15
Important Notices ............................................................................................................... 16
SLAU155 – August 2005 Contents 3

Contents 4 SLAU155 – August 2005

Chapter 1SLAU155 – August 2005
Overview
Texas Instrument’s TSW1100 allows for high-speed digital data capture from Texas Instruments highspeed, high-resolution analog-to-digital converters (ADC). It comes complete with software, allowing theuser to quickly evaluate Texas Instruments ADCs without the need for expensive logic analyzers andcomplex analysis routines. The TSW1100 features data capture speeds of up to 140 MSPS and datacapture depths of up to 16 x 1 million points. It can operate in dual-channel mode allowing simultaneouscapture of a dual-channel ADC. Data is transferred via a USB interface allowing easy PC control and itrequires only one power supply for operation. The TSW1100 is compatible with the following TexasInstruments ADC EVMs: ADS5424, ADS5423, ADS5553, and the TSW1000 (ADS5500). EVM Rev C ofthe ADS5500, ADS5541, ADS5542, ADS5520, ADS5521, and the ADS5522 will also be supported.
This guide allows for a quick setup of commonly used functions; such as setup, acquiring data, saving,and recalling data and performing screen captures. Install the software before using this guide. For morecomplete documentation, see the TSW1100 user’s guide.
SLAU155 – August 2005 Overview 5

www.ti.com
Overview 6 SLAU155 – August 2005

2.1 Connect to a Texas Instrument’s ADC EVM
2.2 Provide Power to the ADC EVM
2.3 Providing Power to the TSW1100
2.4 Connecting to the USB
2.5 Launching the TSW1100 Software
Chapter 2SLAU155 – August 2005
Setup the TSW1100
The TSW1100 has a defined bring up procedure. Follow the steps below in order to ensure properoperation. Not following this procedure could result in improper operation.
Before connecting an ADC, see the TSW1100 website to view the most up to date ADC EVM compatibilitylist. On compatible Texas Instruments ADC EVMs’, connect the right angle digital data output connector toeither J1 or J2. J1 connects to channel 1 of the TSW1100, while J2 connects to channel 2 of theTSW1100. For an ADC with single-channel data output, it is recommended that you connect to channel 2of the TSW1100, as it is dedicated for high speed captures.
Follow the ADC EVM user’s guide instructions and power on the ADC EVM.
You may use either a wall mount transformer that has an output rating of 12 VDC and 500 mA or you canuse a lab power supply that can supply a 12 VDVC to J8 while connecting the return to J9. TexasInstruments recommends that you set a current limit of 500 mA. Power on the TSW1100.
With the PC turned on, connect the USB cable from the PC to the TSW1100 USB connector, J10. At thispoint, the PC should recognize the TSW1100. To verify, you can go to the Hardware Device Manager andselect USB Devices and ensure the TSW1100 is listed as a USB device. At this point, you will also seethe LED D13 illuminated on the TSW1100 signaling that the device has been configured properly and iscommunicating with the PC. This should be the only LED illuminated. If, at this point more than D13 isilluminated, depress the Reset switch (SW2) on the TSW1100.
With the TSW recognized by the hardware device manager, you can run the software package. To run theprogram, click on Start -> Program Files -> Texas Instruments -> Texas Instruments ADC Capture Card.This launches the program window. Initially, the software should display diagnostic info on the FPGversion number in the status window.
SLAU155 – August 2005 Setup the TSW1100 7

www.ti.com
Launching the TSW1100 Software
Setup the TSW11008 SLAU155 – August 2005

3.1 Information
3.2 Setting Up Remote Control of Instruments
3.3 Select the ADC Under Evaluation
3.4 Configure the Input Waveform (A
IN
) Conditions
3.5 Configure the ADC Sampling Frequency (F
S
) Conditions
3.6 Configure the TSW1100 Capture
Chapter 3SLAU155 – August 2005
Capture the ADC Samples, Perform an FFT, and Plot theResults
This section allows you to capture the raw digital data output from the ADC, perform an FFT, plot theresults, and display the performance of the ADC under evaluation.
For the best performance, Texas Instruments recommends using an Agilent 8644 for both the signalsource and the clock source with the appropriate filters. The TSW1100 software automatically controlsthese instruments if they are hooked up using GPIB and the Remote Control of Lab Instruments is turnedon in the Equipment Setup tab. You may also change the GPIB address for both the signal generator andclock generator.
In the top left-hand corner of the user controls, find the pulldown control labeled Texas Instruments chip.Select the appropriate EVM from the list. Based off this selection, the software automatically updates theADC characteristic indicators: number of bits and 2’s compliment.
Find the control labeled Desired Frequency and change it to the sinusoidal frequency you would like toprovide to the ADC analog input. In its default state and for best ADC performance, the softwarecalculates a coherent bin based off of a prime integer and it displays it in the frequency indicator. If youare not using the Remote Control of Lab Instruments feature, then manually set your signal source outputfrequency to coincide with the displayed frequency indicator. You also have control over the amplitude ofthe signal source; Texas Instruments recommends that you set this to be -1 dBFS of the device underevaluation.
Find the control labeled Sampling Frequency and set this to the value at which you want to clock the ADC.For the best performance, do not set this above the recommended device operating frequency. Set theclock amplitude by varying the Clock Amplitude control.
With the understanding that J1 connects to channel 1 and J2 connects to channel 2 of the TSW1100, usethe Capture control to select which channel the ADC EVM is connected to. Select the depth of capture byselecting the acquisition size in the Number of Points control. Texas Instruments recommends that you setthis to 16384 for sinusoidal input evaluation.
SLAU155 – August 2005 Capture the ADC Samples, Perform an FFT, and Plot the Results 9

www.ti.com
3.7 Acquire Data
Acquire Data
At this point you are ready to capture data from the ADC. You can do so by clicking on the red circularAcquire Data button located below the graph. The button turns green and stay green until the capture iscomplete. After it is complete, you will see a FFT plot as well as Capture Statistics and FFT Computations.
Capture the ADC Samples, Perform an FFT, and Plot the Results10 SLAU155 – August 2005