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dac芯片输出电路设计请教

Other Parts Discussed in Thread: DAC8552, DAC8551

我利用dac8551/dac8552芯片通过3伏基准电压芯片产生0到150mv的电压信号,为了防止万一单片机程序出错导致dac输出满量程电压3伏,我想在dac芯片输出端串联两个精密电阻进行分压强制让电压不超过150mv。请问这样可行吗?电阻值如何选取?另外,在上电的时候,如果单片机不给dac芯片发送指令,dac默认输出为0吧?