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<html><head><title>饮水思源精华区</title><Content-type: text/html; charset=gb2312><link rel=stylesheet type=text/css href="bbsdl.css"></head><table cellspacing=0 class=title width=90%><th class=title align=left width=20%>饮水思源站</th><th class=title align=center width=60%>文章阅读</th><th class=title align=right width=20%>精华区离线浏览</th></tr></table><hr><table align=center cellspacing=1 class=doc><tr><td>发信人:&nbsp;fangf&nbsp;(方方),&nbsp;信区:&nbsp;DSP<br>标&nbsp;&nbsp;题:&nbsp;高&nbsp;分&nbsp;辩&nbsp;率A/D&nbsp;变&nbsp;换&nbsp;器&nbsp;应&nbsp;用&nbsp;考&nbsp;虑(四)<br>发信站:&nbsp;饮水思源站&nbsp;(Sat&nbsp;Jun&nbsp;&nbsp;5&nbsp;10:23:42&nbsp;1999)&nbsp;,&nbsp;站内信件<br>----&nbsp;同&nbsp;时&nbsp;数&nbsp;据&nbsp;捕&nbsp;获&nbsp;<br><br>----&nbsp;Pentek&nbsp;公&nbsp;司&nbsp;的Model&nbsp;4242&nbsp;和4275&nbsp;是&nbsp;用&nbsp;于MIX&nbsp;总&nbsp;线&nbsp;的&nbsp;高&nbsp;分&nbsp;辩&nbsp;率A/D&nbsp;<br>变&nbsp;换&nbsp;器。Model4275&nbsp;是&nbsp;一&nbsp;种16&nbsp;位&nbsp;分&nbsp;辩&nbsp;率&nbsp;的&nbsp;∑&nbsp;Δ&nbsp;变&nbsp;换&nbsp;器&nbsp;板。&nbsp;能&nbsp;<br>以100kHz&nbsp;取&nbsp;样&nbsp;率&nbsp;从32&nbsp;个&nbsp;通&nbsp;道&nbsp;同&nbsp;时&nbsp;捕&nbsp;获&nbsp;数&nbsp;据。&nbsp;像ICS-110B&nbsp;那&nbsp;样，&nbsp;<br>由32&nbsp;个&nbsp;板&nbsp;上&nbsp;数&nbsp;字&nbsp;低&nbsp;通&nbsp;滤&nbsp;波&nbsp;器&nbsp;进&nbsp;行&nbsp;信&nbsp;号&nbsp;调&nbsp;节，&nbsp;把&nbsp;模&nbsp;拟&nbsp;信&nbsp;号&nbsp;带&nbsp;<br>宽&nbsp;限&nbsp;制&nbsp;到45kHz。&nbsp;此&nbsp;板&nbsp;不&nbsp;需&nbsp;要&nbsp;求&nbsp;助&nbsp;于&nbsp;一&nbsp;个&nbsp;独&nbsp;立&nbsp;的&nbsp;子&nbsp;板。&nbsp;它&nbsp;的&nbsp;输&nbsp;<br>入&nbsp;阻&nbsp;抗&nbsp;是&nbsp;受&nbsp;限&nbsp;制&nbsp;的&nbsp;并&nbsp;固&nbsp;定&nbsp;到10k&nbsp;Ω。&nbsp;取&nbsp;样&nbsp;率&nbsp;有13&nbsp;档&nbsp;选&nbsp;择，&nbsp;<br>从8.25kHz&nbsp;到100kHz&nbsp;的&nbsp;满&nbsp;取&nbsp;样&nbsp;率。&nbsp;最&nbsp;小&nbsp;动&nbsp;态&nbsp;范&nbsp;围&nbsp;限&nbsp;制&nbsp;到88dB，&nbsp;这&nbsp;小&nbsp;<br>于16&nbsp;位&nbsp;变&nbsp;换&nbsp;器&nbsp;所&nbsp;希&nbsp;望&nbsp;的96dB。&nbsp;<br><br>----&nbsp;与&nbsp;此&nbsp;同&nbsp;时，Pentek&nbsp;公&nbsp;司&nbsp;的Model&nbsp;4242&nbsp;是&nbsp;用&nbsp;于Intel&nbsp;公&nbsp;司32&nbsp;位&nbsp;模&nbsp;块&nbsp;<br>化&nbsp;接&nbsp;口&nbsp;扩&nbsp;展（MIX）&nbsp;总&nbsp;线&nbsp;的&nbsp;一&nbsp;种&nbsp;高&nbsp;分&nbsp;辩&nbsp;率A/D&nbsp;板。&nbsp;这&nbsp;种&nbsp;单&nbsp;通&nbsp;道18&nbsp;<br>位A/D&nbsp;板&nbsp;采&nbsp;用Burr-Brown&nbsp;PCM&nbsp;1750A/D&nbsp;变&nbsp;换&nbsp;器。&nbsp;取&nbsp;样&nbsp;率&nbsp;可&nbsp;在153&nbsp;～200kHz&nbsp;<br>范&nbsp;围&nbsp;内&nbsp;变&nbsp;化。&nbsp;输&nbsp;入&nbsp;隔&nbsp;离&nbsp;用&nbsp;一&nbsp;个7&nbsp;阶&nbsp;椭&nbsp;圆&nbsp;低&nbsp;通&nbsp;滤&nbsp;波&nbsp;器&nbsp;来&nbsp;维&nbsp;持，&nbsp;<br>此&nbsp;椭&nbsp;圆&nbsp;低&nbsp;通&nbsp;滤&nbsp;波&nbsp;在&nbsp;通&nbsp;带&nbsp;内&nbsp;提&nbsp;供&nbsp;良&nbsp;好&nbsp;的&nbsp;群&nbsp;延&nbsp;迟&nbsp;特&nbsp;性&nbsp;和&nbsp;增&nbsp;益&nbsp;均&nbsp;<br>匀&nbsp;性。Model&nbsp;4275&nbsp;和Model&nbsp;4242&nbsp;都&nbsp;配&nbsp;备16k&nbsp;取&nbsp;样FIFO&nbsp;以&nbsp;使&nbsp;相&nbsp;关&nbsp;信&nbsp;号&nbsp;处&nbsp;<br>理&nbsp;器&nbsp;从&nbsp;慢&nbsp;速&nbsp;外&nbsp;设&nbsp;接&nbsp;受&nbsp;数&nbsp;据&nbsp;的&nbsp;开&nbsp;销&nbsp;最&nbsp;小。&nbsp;这&nbsp;两&nbsp;种&nbsp;板&nbsp;都&nbsp;不&nbsp;需&nbsp;信&nbsp;<br>号&nbsp;处&nbsp;理&nbsp;器&nbsp;或&nbsp;主&nbsp;机&nbsp;介&nbsp;入&nbsp;可&nbsp;以&nbsp;使&nbsp;数&nbsp;据&nbsp;取&nbsp;样&nbsp;缓&nbsp;冲80&nbsp;毫&nbsp;秒。（&nbsp;彭&nbsp;京&nbsp;湘&nbsp;<br>编&nbsp;译&nbsp;自《Computer&nbsp;Design》Nov.1998）&nbsp;<br>&nbsp;<br>--<br>-----------------------------------------------<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;因一个词的力量<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;我重新开始生活<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;我生来就认识你<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;要把你称作<br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;自由<br><br>※&nbsp;来源:·饮水思源站&nbsp;bbs.sjtu.edu.cn·[FROM:&nbsp;202.120.8.11]<br></tr></table><br><caption align=bottom><hr><table align=center cellspacing=1 class=foot><tr><td class=foot><a href="a-3.htm">返回</tr></table><p class=copyr align=center>Copyright &copy; 2001 <a class=copyr href="http://bbs.sjtu.edu.cn">SJTUBBS</a>, All Rights Reserved.<br><br>版权所有<a class=copyr href="telnet://bbs.sjtu.edu.cn">上海交大BBS饮水思源站</a></caption></body></html>
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