关于ad7991转换的一些疑惑

您好,我在使用ad7991时遇到一些问题

  1. 使用ad7991 配置 配置寄存器是上电配置一次就行了吗?还是说每次读取都要配置
  2. ad转换是在什么时候转换的?是读取结果时写完地址和rw就开始转换了吗?还是说要写寄存器?
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  • +1
    •  Analog Employees 
    on Jun 2, 2020 10:10 AM

    1. 寄存器配置一次即可。

    2. After the master has addressed the AD7991/AD7995/AD7999, the part begins to power up on the ninth SCLK rising edge. At the same time, the acquisition phase begins. When approximately 0.6 µs have elapsed, the acquisition phase ends. The input is sampled and a conversion begins. 

    On the ninth SCLK rising edge of the second byte, if the master sends an ACK, it keeps reading conversion results and the AD7991/AD7995/AD7999 powers up and performs a second conversion.

Reply
  • +1
    •  Analog Employees 
    on Jun 2, 2020 10:10 AM

    1. 寄存器配置一次即可。

    2. After the master has addressed the AD7991/AD7995/AD7999, the part begins to power up on the ninth SCLK rising edge. At the same time, the acquisition phase begins. When approximately 0.6 µs have elapsed, the acquisition phase ends. The input is sampled and a conversion begins. 

    On the ninth SCLK rising edge of the second byte, if the master sends an ACK, it keeps reading conversion results and the AD7991/AD7995/AD7999 powers up and performs a second conversion.

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