Cirrus-logic CapturePlus II Manual do Utilizador Página 1

Copyright © Cirrus Logic, Inc. 2008(All Rights Reserved)www.cirrus.comCapturePlus IIHigh-speed Data Acquisition SystemFeatures High-speed Data Acquis

CapturePlus II10 DS789UM24.2 Menu TabsThe menu tabs are always present at the top of the software panels and provide access to configurationand data c

CapturePlus IIDS789UM2 114.2.1 Communication Configuration TabThe Communication Configuration panel establishes the communications link between the Ca

CapturePlus II12 DS789UM2USB CommunicationsA USB communication link must be established between the PC and the CapturePlus II hardware beforethe Captu

CapturePlus IIDS789UM2 134.2.2 General Configuration TabThe General Configuration tab provides access to configure the scaling for all software-genera

CapturePlus II14 DS789UM24.2.3 ADC Configuration TabThe ADC Configuration tab provides a method for reading and writing to the ADC digital gain and of

CapturePlus IIDS789UM2 154.2.4 Configuration TabThe Configuration tab provides access to configure the ADC and the data acquisition system. Click onan

CapturePlus II16 DS789UM24.2.5 Time Domain TabThe Time Domain tab displays the data set in the time domain. Select the Time Domain tab to displaythis

CapturePlus IIDS789UM2 174.2.6 Frequency Domain TabThe Frequency Domain tab displays the data set in the frequency domain. Select the Frequency Domai

CapturePlus II18 DS789UM2attenuation of 125 dB.Crystal 7 Term: The Hodie 5 Term Windowing Function is a proprietary 7-term digital filter optimized fo

CapturePlus IIDS789UM2 194.2.7 Histogram TabThe Histogram tab displays the data set using statistical analysis. Select the Histogram tab to display t

CapturePlus II2 DS789UM2TABLE OF CONTENTS1. CAPTUREPLUS II HARDWARE OVERVIEW ...

CapturePlus II20 DS789UM2– Variance: The variance statistical measurement is in units of volts2 or LSBs2 (least significant bits). The variance stati

CapturePlus IIDS789UM2 215. CONFIGURING THE CapturePlus II SYSTEM The following sections describe how to configure the CapturePlus II system.The Captu

CapturePlus II22 DS789UM2Click the Connect USB button to connect the communications port. When a communications port is con-figured and communicating

CapturePlus IIDS789UM2 235.2 Selecting the Cirrus Logic Evaluation Board Type In most cases the CapturePlus II system will automatically identify the

CapturePlus II24 DS789UM2APPENDIX A. TESTING THE CIRRUS LOGIC CDB556x/7x/8x EVALUATION BOARDThe following sections describe several basic tests perfor

CapturePlus IIDS789UM2 25Activate the Acquire button. Within the Acquire sub-panel set Select Number of Samples to Capture to524288. Start the test

CapturePlus II26 DS789UM2A typical FFT plot resulting from running a baseline test is shown below. Key information calculated fromthe captured data an

CapturePlus IIDS789UM2 27Activate the Acquire button. Within the Acquire sub-panel set Select Number of Samples to Capture to524288. Click on Enable A

CapturePlus II28 DS789UM2A.1.3 Baseline Noise & Distortion Test - Time Domain AnalysisConnect the evaluation board’s analog input(s) to circuit gr

CapturePlus IIDS789UM2 29Start the test run by clicking OK. Upon completing the data capture, the screen will automatically displaythe results. A ty

CapturePlus IIDS789UM2 31. CAPTUREPLUS II HARDWARE OVERVIEW1.1 Kit Contents The following items are included in the CapturePlus II kit.– Cirrus Logic

CapturePlus II30 DS789UM2A.1.4 Baseline Noise & Distortion Test - Histogram AnalysisConnect the evaluation board’s analog input(s) to circuit grou

CapturePlus IIDS789UM2 31Start the test run by clicking OK. When the data has been captured and is ready to be displayed, theStatus window at the bot

CapturePlus II32 DS789UM2A.2 Measuring Analog Input SignalsA.2.1 Setting Up the Input Signal AmplitudeConnect the signal source to the evaluation boar

CapturePlus IIDS789UM2 33Start the test run by clicking OK. At the end of the test run the screen will automatically display the results.A typical ti

CapturePlus II34 DS789UM2A.2.2 Measuring a Single Analog Input SignalA test to determine the evaluation board performance with a full-scale input sign

CapturePlus IIDS789UM2 35Click on the Acquire button. Within the Acquire sub-panel, set Select Number of Samples to Capture to524288. Click on Enable

CapturePlus II36 DS789UM2A.2.3 Measuring Multiplexed Analog Input SignalsThe following section demonstrates how testing the evaluation board performan

CapturePlus IIDS789UM2 37Click the Acquire button. Within the Acquire sub-panel, set Select Number of Samples to Capture to524288. Click on Enable Ave

CapturePlus II38 DS789UM2Key information calculated from the captured data and displayed is the SFDR, SINAD, S/D, and SNR. Notice that when running

CapturePlus IIDS789UM2 39APPENDIX B. RECOMMENDATIONS FOR MAXIMUM PERFORMANCEThe following are some general recommendations for maximizing the performa

CapturePlus II4 DS789UM22. SOFTWARE SETUPThe following section assumes the software is being installed from the CD-ROM included in the kit. The comple

CapturePlus II40 DS789UM2APPENDIX C. FFT WINDOW LEAKAGEWindowing functions which are used to make FFT (Fast Fourier Transform) plots more informative

CapturePlus IIDS789UM2 41NOTES

CapturePlus II42 DS789UM2Contacting Cirrus Logic SupportFor all product questions and inquiries contact a Cirrus Logic Sales Representative. To find t

CapturePlus IIDS789UM2 53. HARDWARE SETUPThe following section describes the connections between the Cirrus Logic evaluation board and the Cap-turePlu

CapturePlus II6 DS789UM24. SOFTWARE DESCRIPTIONThe CapturePlus II Software user interface is divided into two sections:– The data control sub-panels a

CapturePlus IIDS789UM2 74.1.1 Device Sub-panelThe Device sub-panel configures the CapturePlus II system to capture data from the evaluation board.This

CapturePlus II8 DS789UM2– Timed Conversion or Continuous Conversion: Click on the toggle switch to change between Timed Conversion and Continuous Conv

CapturePlus IIDS789UM2 94.1.3 View Sub-panelUse the View sub-panel to select the evaluation board analog input channel data set on which the soft-ware