[原创] ADI ADHV4702－124V至220V精密运算放大器解决方案

ADI公司的ADHV4702-1是高压(220V)一增益稳定精密运算放大器,具有高输入阻抗和低输入偏压电流,低输入失调电压,低漂移和低噪音,对称工作电压±110 V,不对称单源工作电压220V,开环增益(AOL)170dB,共模抑制比(CMRR)160dB,最大事端失调电压(VOS) 2 μV/℃,输入噪音8 nV/√Hz ,主要用在高边电流检测,自动测试设备,高压驱动器,压电传感器以及数模转换器(DAC)输出缓冲器.本文介绍了ADHV4702-1主要特性,功能框图以及评估板EVAL-ADHV4702-1CPZ主要特性,电路图和材料清单.

The ADHV4702-1 is a high voltage (220 V), unity-gain stable precision operational amplifier. The ADHV4702-1 offers high input impedance with low input bias current, low input offset voltage, low drift, and low noise for precision demanding applications. The next generation of proprietary semiconductor processes and innovative architecture from Analog Devices, Inc., enable this precision operational amplifier to operate from symmetrical dual supplies of ±110 V, asymmetrical dual supplies, or a single supply of 220 V.

For precision performance, the ADHV4702-1 has a 170 dB typical open-loop gain (AOL) and a 160 dB typical common-mode rejection ratio (CMRR), as shown in Figure 2. The ADHV4702-1 also has a 2 μV/℃ maximum input offset voltage (VOS) drift and an 8 nV/√Hz input voltage noise.
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