[原创] ADI AD7403高性能二阶Σ－Δ调制解决方案

ADI公司的AD7403是高性能二阶Delta-Sigma调制器,能把模拟输入信号转换成高速单比特数据流,外时钟频率5-20MHz,16位不丢失码,SNR 88dB,温度漂移1.6 μV/℃, 满刻度输入范围±320 mV,工作温度−40℃ 到 + 125℃,主要用在马达控制,电源和太阳能逆变器,数据采集系统,风能逆变器,并联电流监视器等.本文介绍了AD7403主要特性,框图, 评估板EVAL-AD7403FMCZ主要特性,框图,电路图,材料清单和PCB元件布局图.

The AD7403 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 AD7403 operates from a 5 V (VDD1) power supply and accepts a differential input signal of ±250 mV (±320 mV full-scale). The 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 20 MHz. The original information can be reconstructed with an appropriate digital filter to achieve 88 dB signal to noise ratio (SNR) at 78.1 kSPS. The serial input/output can use a 5 V or a 3 V supply (VDD2).
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