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DAC8728不同参考电压,工作不正常的问题

Other Parts Discussed in Thread: DAC8728

我的电源电压为+15V,-15V,参考电压为2.5--5V,IO电源电压为3.3V;当采用2.5V,3.3V参考电压时,系统复位输出0V(U\S\B\/BTC=0;RSTSEL=1 ),配置寄存器也能得到正确的输出结果,但是采用同样的电路,参考电压为5V时,系统复位后电压大概是5到6V,配置寄存器电压可以往负向,但不能再往上,即可以可以输出-5V,-8V等。非常奇怪。求解,谢谢!!