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ADI ADA4254零飘移高压低功耗可编增益仪表放大器解决方案

ADI公司的ADA4254是零飘移高压低功耗可编增益仪表放大器(PGIA),具有12二进制加权增益,从1/16V/V到128V/V,具有三个可选增益1V/V,1.25V/V和1.35V/V,一共有36种可设增益.而ADA4254的功耗仅仅为22mW,特别适合于需要精密鲁棒和低功耗的工业系统.零飘移放大器拓扑采用自校准DC误差和低频1/f噪音,在整个温度范围内具有极好的DC精度,从而最大化动态范围,在许多应用中大大降低了校准要求.输入的复接器对放大器高阻抗输入提供±60 V保护,同时能在两个输入源中进行切换.此外,电磁干扰(EMI)滤波器阻隔了放大器敏感输入的RF噪音. ADA4254的各种安全特性检测内部和外部的故障.七个通用兵输入/输出(GPIO)引脚可配置成特别的功能,激励电流输出可用来偏压传感器如电阻型温度检测器(RTD).工作温度−40℃到 +105℃,采用紧凑的5mmx5mm28引脚LFCSP和24引脚TSSOP封装.工作电压±5 V 到 ±28 V.主要用在通用过程控制前端,数据采集系统和测试测量系统.本文介绍了ADA4254主要特性,简化功能框图和可编增益仪表放大器拓扑图,多种应用电路图,以及评估板ADA4254RU-EBZ主要特性,电路图和材料清单.

The ADA4254 is a zero drift, high voltage, low power programmable gain instrumentation amplifier (PGIA) designed for process control and industrial applications. The ADA4254 features 12 binary weighted gains ranging from 1/16 V/V to 128 V/V and three scaling gain options of 1 V/V, 1.25 V/V, and 1.375 V/V, resulting in 36 possible gain settings. The power consumption of the ADA4254 is a mere 22 mW, making the device an excellent choice for industrial systems that demand precision, robustness, and low power.

The zero drift amplifier topology of the ADA4254 self calibrates dc errors and low frequency 1/f noise, achieving excellen

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