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CDBCAPTURE Datasheet(PDF) 2 Page - Cirrus Logic |
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CDBCAPTURE Datasheet(HTML) 2 Page - Cirrus Logic |
2 / 10 page CDBCapture+ 2 DS327F1 OVERVIEW The CDBCapture+ interface board and software are used to capture blocks of serial data from an A/D converter on an evaluation board. This data can be transferred to a PC for analysis and storage. The CDBCapture+ board buffers the digital data in on-board RAM memory and transfers the data to the PC via an RS232 COM port. Figure 1 is a func- tional block diagram that illustrates the data acqui- sition process. The setup for the CDBCapture+ board is simple. A serial cable is connected from the evaluation board to the CDBCapture+ board. This cable will in some cases be a multi-wire conductor and in other cases, depending on the evaluation board being tested, it may be an RCA phono jack or optical in- put for S/PDIF audio data. The interface circuits are provided with electrical isolation between the evaluation board and the CDBCapture+ board to eliminate ground loops. An RS232 cable is con- nected from the CDBCapture+ board to a PC COM port and the PC is loaded with the CDBCapture+ software. An external +5 Volt power supply is re- quired to power the CDBCapture+ board, in addi- tion to any power required for the evaluation board. Upon power-up, the DSP on the CDBCapture+ board starts monitoring the serial COM port for ap- plication software that allows the DSP to program a gate-array on the board to act as an interface for the specific A/D converter on the evaluation board. In this manner, the CDBCapture+ board can be re- programmed to communicate with a large variety of different A/D converters and evaluation boards. Once the on-board gate-array is programmed, the data collection process is started by sending a com- mand from the PC to the CDBCapture+ board. LED indicators on the CDBCapture+ board indi- cate system status during acquisition of data from the evaluation board and during transfer of data to the PC. The CDBCapture+ board can be directed to collect one or, depending on the A/D converter being evaluated, two channels of data from the evaluation board. The data is stored in an on-board RAM until data acquisition is complete, then upon command from the PC, it is sent to the PC via the RS232 COM port. The evaluation and display software provided for the PC was developed using LabWindows and per- forms the post processing of the digitized signals. Time plots, FFT analysis, noise analysis, and dif- ferential nonlinearity (DNL) analysis are included. The software allows as many as 32768 samples to be acquired and analyzed. DNL analysis is sup- ported only for converters with 16 bits or lower res- olutions. For more sophisticated data analysis, the LabWindows® development system can be pur- chased from National Instruments (512-794-0100). LabWindows is a registered trademark of National Instruments Corp. Preliminary product information describes products which are in production, but for which full characterization data is not yet available. Advance product information describes products which are in development and subject to development changes. Cirrus Logic, Inc. has made best efforts to ensure that the information contained in this document is accurate and reliable. However, the information is subject to change without notice and is provided “AS IS” without warranty of any kind (express or implied). No responsibility is assumed by Cirrus Logic, Inc. for the use of this information, nor for infringements of patents or other rights of third parties. This document is the property of Cirrus Logic, Inc. and implies no license under patents, copyrights, trademarks, or trade secrets. No part of this publication may be copied, reproduced, stored in a retrieval sys- tem, or transmitted, in any form or by any means (electronic, mechanical, photographic, or otherwise). Furthermore, no part of this publication may be used as a basis for manufacture or sale of any items without the prior written consent of Cirrus Logic, Inc. The names of products of Cirrus Logic, Inc. or other vendors and suppliers appearing in this document may be trademarks or service marks of their respective owners which may be registered in some jurisdictions. A list of Cirrus Logic, Inc. trademarks and service marks can be found at http://www.cirrus.com. |
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