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问 1.芯片为AD7541,max7541.
2.参考电压的absolute max rating为正负25V,可是推荐运行条件没写,我可以让参考电压为24V吗?
3.电源电压最大为17V,参考电压最大为正负25V,参考电压可以大于电源电压吗?
4.什么叫multify DA? 答 1: 可以这个是乘法型DA,参考电压是通过里面的电阻网络配合输入的code得到两个输出，后面再接两个运放，输出电压的范围就和你运放的电源电压有关
但是除非必要，各项参数都不要太靠近absolute max rating的好 答 2: 4题答案4题答案    A DAC has an analog reference voltage or current which is multiplied by the digital input word. So, basically, the DAC is a multiplier 答 3: 4题答案While the ADC tells us the ratio between the input and a reference, we say it is a divider. However, the DAC output is the product of the input word and its reference, so it is a multiplier. Both the ADC and the DAC have a gain factor that is most often unity. 答 4: 这个是偶工作中要用到的特性All DACs are multipliers in that their output is the product of the input word and a reference voltage or current. Most DACs are designed to function well over a narrow range of d.c. reference voltages or currents. But a DAC that is called a multiplying DAC is special in that it is designed to function well with an a.c. signal at the reference input, allowing the DAC to be used as a digital attenuator. 答 5: multiplying DAC的参考端可以输入AC信号Most DACs are designed to function well over a narrow range of d.c. reference voltages or currents.
大多数的DA被设计的功能,参考电压和电流只能在dc很窄的范围变动. 答 6: DA类型                    reference           output
1.single quadrant     +                   +
2.two quadrant        +                   + -
                     + -                   +
3.four quadrant      + -                  + -

One type of multiplying DAC is a single quadrant one where the reference and output each CAN only be positive for proper functioning.
Another type of multiplying DAC is a two quadrant one where the reference must be positive but the output CAN take on positive or negative values, or where the reference CAN be positive or negative but the output CAN only be positive. Most commonly, a two quadrant DAC is limited to a positive only reference.
The four quadrant multiplying DAC may have both reference and output values that CAN be either positive or negative.
The multiplying DAC is also called an MDAC. 答 7: 问题3参考电压的确可以大于电源电压，但这有什么意义呢?
可以让LSB对应的电压变大,why?