【选型】可pin to pin替换ADI AD620的仪表放大器SGM620，输入电压噪声0.22uVp-p且功耗更低

时间： 2020-07-18 来源：SGMICRO

技术问答

电子秤和传感器接口等精密数据采集系统通常会用到仪表放大器调理模拟信号，ADI的AD620存在大量应用，为降低美系器件比例和BOM成本，需要国产化替代。

针对精密低功耗仪表放大器应用，国产圣邦微电子推出了轨到轨输出的仪表放大器SGM620，采用CMOS工艺，它可以采用3.6V至36V的单电源供电或+/-1.8V至+/-18V的正负电源供电。其最大输入失调电压小于80uV，电压噪声峰峰值0.22uVp-p，以下是两个运放的电气性能参数对比：

从以上参数对比可以看出SGM620在输入偏置电流、放大增益、封装等参数与AD620基本一致，但功耗、输入电压噪声和电源电压范围等指标都优于AD620。尤其是SGM620电源电压范围更宽，可以适应更多的系统应用；电压噪声和非线性指标更好，提高系统抗干扰性和信号放大精度；工作电流减小近三分之一，可以降低系统功耗，提高长期可靠性，两者封装同为SOIC-8，具体PIN脚定义如下图：

图1 SGM620（左）与AD620（右）PIN脚对比

从上图对比可以看出SGM620与AD620不仅封装一致，而且PIN脚定义完全相同，可以在不改动电路的前提下直接pin to pin替换，减少工程师替换设计工作量。

综上所述，圣邦微电子的精密仪表运算放大器SGM620不仅可以pin to pin替代ADI的AD620，还具有相对更低的功耗和更低的噪声，成本更具优势，是精密数据采集系统中美系品牌仪表放大器的优秀替代解决方案。

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qinlu123 Lv7. 资深专家 2020-12-13

参数
qinlu123 Lv7. 资深专家 2020-12-13

有手册吗我想看一下详细

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华冠半导体（HGSEMi）半导体器件选型指南

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