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📁 Input/Data Acquisition System Design for Human Computer Interfacing
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<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.2//EN"><!--Converted with LaTeX2HTML 96.1 (Feb 5, 1996) by Nikos Drakos (nikos@cbl.leeds.ac.uk), CBLU, University of Leeds --><HTML><HEAD><TITLE>4.1 Requirements for A-D converters</TITLE><META NAME="description" CONTENT="4.1 Requirements for A-D converters"><META NAME="keywords" CONTENT="sensors"><META NAME="resource-type" CONTENT="document"><META NAME="distribution" CONTENT="global"><LINK REL=STYLESHEET HREF="sensors.css" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/sensors.css"></HEAD><BODY BGCOLOR="#FFFFFF" TEXT="#000000" LANG="EN"> <A NAME="tex2html218" HREF="node14.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node14.html"><IMG WIDTH=37 HEIGHT=24 ALIGN=BOTTOM ALT="next" SRC="next_motif.gif" tppabs="http://ccrma.stanford.edu/Images//next_motif.gif"></A> <A NAME="tex2html216" HREF="node12.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node12.html"><IMG WIDTH=26 HEIGHT=24 ALIGN=BOTTOM ALT="up" SRC="up_motif.gif" tppabs="http://ccrma.stanford.edu/Images//up_motif.gif"></A> <A NAME="tex2html210" HREF="node12.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node12.html"><IMG WIDTH=63 HEIGHT=24 ALIGN=BOTTOM ALT="previous" SRC="previous_motif.gif" tppabs="http://ccrma.stanford.edu/Images//previous_motif.gif"></A>   <BR><B> Next:</B> <A NAME="tex2html219" HREF="node14.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node14.html">4.2 Additional Requirements for </A><B>Up:</B> <A NAME="tex2html217" HREF="node12.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node12.html">4 Signal Conditioning</A><B> Previous:</B> <A NAME="tex2html211" HREF="node12.html" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/node12.html">4 Signal Conditioning</A><BR> <P><H2><A NAME="SECTION00041000000000000000">4.1 Requirements for A-D converters</A></H2><P>The primary purpose for the analog signal conditioning circuitry is to modify the sensor 
output into a form that can be optimally converted to a discrete time digital data stream by 
the data acquisition system.  Some important input requirements of most data acquisition 
systems are:
<OL><LI> The input signal must be a voltage waveform. The process of converting the sensor 
output to a voltage can also be used to reduce unwanted signals, i.e., noise.<LI> The dynamic range of the input signal should be at or near the dynamic range of the 
data acquisition system (usually equal to the voltage reference level, Vref, or 2*Vref). 
This is important in maximizing the resolution of the analog to digital converter 
(ADC).<LI> The source impedance,  <IMG WIDTH=16 HEIGHT=16 ALIGN=TOP ALT="tex2html_wrap_inline1852" SRC="img30.gif" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/img30.gif"  > ,  of the input signal should be low enough so that 
changes in the input impedance,  <IMG WIDTH=22 HEIGHT=16 ALIGN=TOP ALT="tex2html_wrap_inline1854" SRC="img31.gif" tppabs="http://ccrma.stanford.edu/CCRMA/Courses/252/sensors/img31.gif"  > , of the data acquisition system do not affect 
the input signal.<LI> The bandwidth of the input signal must be limited to less than half of the sampling rate
of the analog to digital conversion.
</OL><BR> <HR><P><ADDRESS><I>Tim Stilson <BR>Thu Oct 17 16:32:33 PDT 1996</I></ADDRESS></BODY></HTML>
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