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Q1—Continuous mode下是否可以只打开一个通道?数据手册上的内容如下:
After the conversion is complete, the relevant channel data register and channel status register are updated, the relevant RDY bit in the ADC status register is set, and the AD7732 continues converting on the next enabled channel. Q2—系统中有AD7732和AD5754两片模数混合芯片,对于AD7732采用数字和模拟地都连到模拟地,AD5754在靠近DAC处单点接地,这样的方案是否可行?
Q3—关于Continuous Read (Continuous Conversion) Mode,有这样一段话:
When the Cont RD bit in the mode register is set, the first write of 48h to the communications register starts the continuous read mode. As shown in Figure 22, subsequent accesses to the part sequentially read the channel status and data registers of the last completed conversion without any further configuration of the communications register being required.
Note that the continuous conversion bit in the mode register should be set when entering the continuous read mode. 按照这段话的描述,写进mode register的应该是24H才对,但是文中的图是48H,如下图:
Q4—对于AD7732和AD5754是否需要用两个参考电压,共用一个电压参考有没有问题? |
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