在AD5421参考资料CN0267_CN中，FLZ4V7A的极性为阳极接地，但在CN0267 设计和集成文件中是阴极接地，哪个是正确的接法

您好，根据芯片手册，"Under normal operating conditions, the voltage between COM and LOOP− does not exceed 1.5 V, and the voltage at LOOP− is negative with respect to COM. If it is possible that the voltage at LOOP− may be forced positive with respect to COM, or if the voltage difference between LOOP− and COM may be forced in excess of 5 V, a 4.7 V low leakage Zener diode should be placed between COM and the LOOP− pin, as shown in Figure 50, to protect the AD5421 from potential damage." 因此，阴极接地以避免该点电压低于-5V（Com为0V）。