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PGA411激励差分过压保护点问题



问题:规格书第10页和第35页OVEXC过压保护点为14V(7 Vrms mode),而第8页VEXCO输出电压最大能到24.27V(7-V RMS mode; EXTOUT_GL = 0x0F)。测试时设置7-V RMS mode; EXTOUT_GL = 0x0F,VEXCO=22.6V,PGA411没有报OVEXC过压故障,波形见图4。请问OVEXC过压保护点(Differential overvoltagethreshold)是如何理解的,保护点是多少V?

图1 规格书第10页截图

图2 规格书第35页截图

图3 规格书第8页截图

图4 实测波形(7-V RMS mode; EXTOUT_GL = 0x0F,蓝色为VEXCO)