近日消息，据外媒报道，美商亚德诺公司（Analog Devices, Inc.;ADI）发表了仪表放大器产品线最新成员--结合精密度、低功率与价值等组合的 AD 8420  微功率仪表放大器。

　　该放大器的高 CMRR 使其非常适用于桥式放大器、压力感测以及类似的用途上，让设计厂商可以大幅的改善便携式与电池供电的精密讯号健康照护仪器应用装置（象是输液帮浦、远端与手持式计量设备、以及智能型手机等）的讯号质量与总体系统性能。

　　AD 8420 具有100dB 的高 CMRR （共模拒斥比），而且只需消耗75uA的功率，可为设计厂商提供比同级产品更好的讯号质量以及更长的电池使用时间。

　　AD 8420 具有绝佳的 200uV 输入偏移与1uV/摄氏度偏移漂移的dc性能，而进阶版的 AD 8420B 则提供更优秀的性能。 AD 8420 透过广大的输入电压范围支援在输出上的轨对轨作业，使其能够将低于电源接地的讯号加以放大。增益（1至1000）可以藉由2组外接电阻的比例加以设定，在 温度范围内提供更高的增益精确度。

　　AD 8420 并具有宽广的2.7V至36V单电源供应 以及+/-18双电源供应范围，并采用精巧的 MSOP-8 封装方式，能够在系统中与各种 SAR A/D 转换器象是 AD 7298-1 与 AD 7291 良好搭配。 AD 8420 已可开始供货。

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