高精度液位控制之AD8221精密仪器放大器
<p class="MsoNormal" style="text-indent:21.0pt;mso-char-indent-count:2.0"><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">看到大家都把板子画出来了，感觉大家真的太快了，直接就做板子，我这里还要测试下，万一做出来费了就</span><span lang="EN-US">game over</span><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:"times="" roman""="">了，向大家学习。</span><span lang="EN-US"><span style="mso-spacerun:yes"> </span></span></font></p><div style="text-align: right;">
<span style="font-size: 10.5pt; font-family: " times="" new="" roman";"="" lang="EN-US">By<span style="mso-spacerun:yes"> </span>fxw451 <br></span><div style="text-align: left;"><!-->
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<p class="MsoNormal"><b style="mso-bidi-font-weight:normal"><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">特性：</span></font><span lang="EN-US"></span></b></p>
<ol><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">易于使用</span></font></li><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">采用节省空间的</span><span lang="EN-US">MSOP</span><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">封装</span></font></li><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">增益通过</span><span lang="EN-US">1</span><span style="font-family:
宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:"times="" roman""="">个外部电阻设置（增益范围：</span><span lang="EN-US">1-1000</span><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";="" mso-hansi-font-family:"times="" roman""="">）</span></font></li><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">宽电源电压范围：±</span><span lang="EN-US">2.3v-</span><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">±</span><span lang="EN-US">18v</span></font></li><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">低噪声</span></font></li><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">输入电压噪声：</span><span lang="EN-US">8</span><b><span style="font-size:9.0pt;font-family:ArialNarrow-Bold;mso-hansi-font-family:HYb2gj-GBK-EUC-H-Identity-H;
mso-bidi-font-family:ArialNarrow-Bold;mso-font-kerning:0pt" lang="EN-US"><span style="position:relative;top:12.0pt;mso-text-raise:-12.0pt"></span></span></b><span style="font-family:宋体;mso-ascii-font-family:
" times="" new="" roman";mso-hansi-font-family:"times="" roman""="">nV/Hz1/2（最大值</span><span lang="EN-US"> 1KHz</span><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";="" mso-hansi-font-family:"times="" roman""="">）</span></font></li><li><font size="4"><span lang="EN-US">0.25uv<span style="position:relative;top:5.0pt;mso-text-raise:-5.0pt"></span></span><span style="font-family:宋体;mso-ascii-font-family:
" times="" new="" roman";mso-hansi-font-family:"times="" roman""="">峰峰值输入噪声（</span><span lang="EN-US">0.1Hz-10Hz</span><span style="font-family:宋体;mso-ascii-font-family:
" times="" new="" roman";mso-hansi-font-family:"times="" roman""="">）</span></font></li><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">高精度直流性能</span></font></li><li><font size="4"><span lang="EN-US">CMRR</span><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";="" mso-hansi-font-family:"times="" roman""="">：</span><span lang="EN-US">90dB</span><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">（最小值</span><span lang="EN-US">G=1</span><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">）</span></font></li><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">输入失调电压：</span><span lang="EN-US">25uV</span></font></li><li><font size="4"><span style="font-family:宋体;mso-ascii-font-family:" times="" new="" roman";mso-hansi-font-family:="" "times="" roman""="">输入偏置电流：</span><span lang="EN-US">0.4nA</span></font></li></ol>
<p class="MsoNormal"><font size="4"><span lang="EN-US"> </span></font><br></p><span style="font-size:10.5pt;mso-bidi-font-size:12.0pt;font-family:
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[ 本帖最后由 fxw451 于 2011-8-10 17:28 编辑 ] <font style="font-family: 宋体;" size="4"><span style="font-weight: bold;">简介：</span><br> AD8221是一款增益可编程、高性能仪表放大器，在业界同类产品中，其相对于频率的共模抑制比(CMRR)最高。当今市场上，仪表放大器的CMRR在 200 Hz时会衰减。与之相比，在G = 1、频率最高为10 kHz时，AD8221所有等级产品的CMRR均保持最低为80 dB。相对于频率的高共模抑制比(CMRR)使得AD8221可以抑制宽带干扰和线性谐波，从而大大简化了滤波要求。可能的应用包括精密数据采集、生物医 学分析和航空航天仪器。 <br> 对于低电压失调、低失调漂移、低增益漂移、高增益精度和高共模抑制比特性要求，使这款器件成为要求具备最佳直流性能应用(如桥式信号调理)的绝佳选择。 <br> 可编程增益赋予用户设计灵活性。通过一个电阻，可在1至1000范围内设置增益。AD8221可以采用单电源或双电源供电，特别适合输入电压为±10 V的应用。<br><span style="font-weight: bold;">对比与AD620</span><br style="font-weight: bold;"><span style="font-weight: bold;">优势：</span><br> 1. 节省空间的MSOP封装，适用于那些对空间要求比较严格的场合；<br> 2. 峰峰值输入噪声性能好<br> 3. 频率的共模抑制比高，是同类业界产品中，频率的共模抑制比最高的。同时在200Hz时不会发生衰减（市场上的同类产品就达不到这个要求）；频率的共模抑制比的特性看详细简洁。<br> 4. 交流特性方面要明显拥有很强的优势。<br>与AD620唯一一点不足的是（这个只是针对我用到的设计中所说的，不具有普遍性）：<br> 当今许多ADC和数字IC都采用电压很低的单电源供电，因此将±10V单端仪表放大器与±5V ADC接口会是个难题，需要进行衰减和电平转换处理。<br><br>值得注意的是：<br> 当要用到差分ADC的话，还要将AD8221进行转换，将单端放大改成差分形式。如果用差分的话，那就应该用其他芯片了差分仪表运放如AD8295B，AD8222B。<br><br></font> 将我写的pdf和ad8221和620分享给大家<br><br><br><br><br><br><br><br><br><br><br><br><br> 有什么不对的地方，还请大家指正！<br><br>我会及时和大家交流！<br>希望得到高手的指点！<br> 文档没有下下来，似乎很强大。 速度很快哟！:)
回复 5楼 yyblike 的帖子
那个文档？？？ 不好意思 请问一下AD8221AR、AD8221ARM、AD8221ARMZ-R7
都有些什么区别啊
商品包装:散装(CT)、商品包装:卷带(TR)代表什么意思啊
不错
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