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CDBCAPTURE Datasheet(PDF) 2 Page - Cirrus Logic

No. de pieza CDBCAPTURE
Descripción Electrónicos  Data Capture and Interface Board for a PC
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Fabricante Electrónico  CIRRUS [Cirrus Logic]
Página de inicio  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CDBCAPTURE Datasheet(HTML) 2 Page - Cirrus Logic

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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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