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[原创] ADI ADuM7701 16位二阶Sigma-Delta(∑-Δ)调制器解决方案

关键词:Sigma-Delta(∑-Δ)调制器 ADC 马达控制器 ADuM7701

时间:2019-07-23 10:59:59       来源:中电网

ADI公司的ADuM7701是高性能16位二阶Sigma-Delta(∑-Δ)调制器,能把模拟输入芯信号转换成高速单位数据流,器件集成了基于ADI公司的iCoupler®技术大数字隔离器.器件工作电压4.5V-5.5V,接收假差分输入信号±250 mV (±320 mV满刻度).模拟输入信号连续由高性能模拟调制器取样,转换成数据速率高达21MHz的一密度数字输出流,而原信息则由合适的sinc3数字滤波器重构成86dB SNR的信号(取样78.1 kSPS,256抽取率和20MHz主时钟),串行接口是数字隔离的.工作温度−40℃到+125℃.主要用在分流电流监测,AC马达控制,电源和太阳能逆变器,风能逆变器,以及模拟/数字转换和光耦器件替代品.本文介绍了ADuM7701主要特性,功能框图,典型应用电路图,典型应用电路图,以及评估板EV-ADuM7701-8FMCZ主要特性,框图,电路图和PCB设计图.

The ADuM7701 is a high performance, second-order, Σ-Δ modulator that converts an analog input signal into a high speed, single-bit data stream, with on-chip digital isolation based on Analog Devices, Inc., iCoupler® technology. The device operates from a 4.5 V to 5.5 V power supply range (VDD1) and accepts a pseudo differential input signal of ±250 mV (±320 mV full-scale). The pseudo differential input is ideally suited to shunt voltage monitoring in high voltage applications where galvanic isolation is required. The analog input is continuously sampled by a high performance analog modulator and converted to a ones density digital output stream with a data rate of up to 21 MHz. The original information can be reconstructed with an appropriate sinc3 digital filt..

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