AD9257

1、AD9257 的CLk+,CLK-输入时钟40M的,AD9257采样速度是不是最大只有40M,如果可以设置成65M,该怎么设置?

2、AD9257 的0xFF寄存器写入了0x01,为什么读出来的值还是0x00;,其他的寄存器可以正常写入,读取出来的数据也是正确的。

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  • +1
    •  Analog Employees 
    on Jun 1, 2020 3:25 PM 9 months ago

    Hi KLSU,

    There are two speed grades of AD9257: 40Msps version (maximum sample rate is 40MHz) and 65Msps version (maximum sample rate is 65MHz). Nothing needs to be set for the AD9257 to work at these sample rates.

    Register 0xFF is self-clearing. It will always read back 0x00.

    The AD9257 clock inputs can handle 80MHz, but you must use the clock frequency divider (Register 0x0B) to divide the clock frequency to an acceptable rate for AD9257. In the default state (divide-by-1), 80MHz clock is too fast for AD9257.

    Thank you.

    Doug

Reply
  • +1
    •  Analog Employees 
    on Jun 1, 2020 3:25 PM 9 months ago

    Hi KLSU,

    There are two speed grades of AD9257: 40Msps version (maximum sample rate is 40MHz) and 65Msps version (maximum sample rate is 65MHz). Nothing needs to be set for the AD9257 to work at these sample rates.

    Register 0xFF is self-clearing. It will always read back 0x00.

    The AD9257 clock inputs can handle 80MHz, but you must use the clock frequency divider (Register 0x0B) to divide the clock frequency to an acceptable rate for AD9257. In the default state (divide-by-1), 80MHz clock is too fast for AD9257.

    Thank you.

    Doug

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