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标题: 高手路过请进来帮帮忙 AD转换时间的问题！！ [打印本页]
作者: rookie    时间: 2008-4-27 18:58
标题: 高手路过请进来帮帮忙 AD转换时间的问题！！
<>&nbsp; 我在进行采图像时 超频到8M 每行可以采到60个点左右</P><P>而且无论是采样时间是2个，4个，8个，还是16个AD周期&nbsp; 都可以采60几点</P><P>按这样计算采一点的时间少于1us;那去掉消隐区可采到50点</P><P>而且明显可以检到黑线&nbsp; 没有错</P><P>而按一公式 </P><P>(2个AD周期&nbsp;) 转换时间=（2+2+8）*1/8M=1.5us;</P><P>其他就更长，这是为什么？？</P>
作者: auto    时间: 2008-4-29 18:31
标题: Re:高手路过请进来帮帮忙 AD转换时间的问题！！
因为你计算错了,
作者: rookie    时间: 2008-4-29 19:43
标题: Re:高手路过请进来帮帮忙 AD转换时间的问题！！
<>那怎么计算</P><P>我按下面的方法算的</P><P> </P><DIV class=O v:shape="_x0000_s1026"><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;">转换时间计算举例</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US>:</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </SPAN></SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US><SPAN style="mso-spacerun: yes">&nbsp;</SPAN>(</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;">假设</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;"> </SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US>2MHZ A/D </SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;">时钟频率</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US>) </SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US></SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;">例</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;"> </SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US>1: </SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;">转换时间</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;"> </SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US>= Initial Sample Time + Programmed Sample Time + Resolution Period </SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US><SPAN style="mso-spacerun: yes">&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;&nbsp; </SPAN>= 2 + 2 + 10 = 14 A/D Clocks </SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US><SPAN style="mso-spacerun: yes">&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;&nbsp; </SPAN>= 7uSec </SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;">例</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;"> </SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US>2: </SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: 宋体; mso-fareast-font-family: 宋体; mso-hansi-font-family: Arial">转换时间</SPAN><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US>= Initial Sample Time + Programmed Sample Time + Resolution Period </SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US><SPAN style="mso-spacerun: yes">&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;&nbsp; </SPAN>= 2 + 16 + 10 = 28 A/D Clocks </SPAN></DIV><DIV><SPAN style="FONT-SIZE: 14pt; FONT-FAMILY: &#39;Times New Roman&#39;; mso-ascii-font-family: &#39;Times New Roman&#39;; mso-fareast-font-family: 宋体; mso-hansi-font-family: &#39;Times New Roman&#39;; mso-fareast-language: ZH-CN" lang=EN-US><SPAN style="mso-spacerun: yes">&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;&nbsp; </SPAN>= 14uSec </SPAN></DIV><DIV style="TEXT-ALIGN: center; mso-line-spacing: &#39;100 50 0&#39;; mso-char-wrap: 1; mso-kinsoku-overflow: 1"></DIV></DIV>
作者: superyongzhe    时间: 2008-4-30 00:22
标题: Re:高手路过请进来帮帮忙 AD转换时间的问题！！
的确是算错了，我也遇到过这个问题，别再算了。用示波器看看波形符不符合需要就行了。不必那么严格！
作者: rookie    时间: 2008-5-3 23:40
标题: Re:高手路过请进来帮帮忙 AD转换时间的问题！！
<>那倒是 ，</P><P>现在图像可以确定OK了</P><P>&nbsp;</P>
作者: huqi6688    时间: 2010-5-10 19:39
用示波器检测下再看看
作者: zhanzhuyi    时间: 2010-5-11 18:57
是不是硬件衔接有问题



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