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.
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