ADAU1701 & NBSP; & NBSP; проблема применения

ADAU1701   Application problem

Активно 8 Ответы 16 Просмотры 2015-02-30 Общие вопросы
  • I just do not understand why 44.KHz sample rate is not mentioned on the serial output port part of the datasheet (page 45):
  • Any idea why it is not mentioned there?

     

  • As for the interface registers, my question is: Can a simple DC block value in SigmaStudio be written to them? How are GPIO blocks involved in the process?


  • guest replied
    9 Months
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin
    guest replied
    4 Years

    Dear Dave

       We focus on the problem is how to use interface registers in E2PROM, can you help again, thanks.

    guest replied
    4 Years

    Dear All

       Thanks for help, wish get your more support in future.

    guest replied
    4 Years

    Hello Allen,

    It is the same basic answer for the 1701 as well. Coleman had answered your question in the earlier thread where you asked the same question:

    guest replied
    4 Years

    Hi Allen,

    I believe  what Dave suggests will be applicable for the ADAU1701.   The default n x fs" clocks shown in Table 11 in the ADAU1701 datasheet assume generating a sample processing rate of 48 kHz.   In order to support a 44.1 kHz processing and 44.1 master serial port LRCLKs, you would need to scale the input clock appropriately, such as:

    64 x fs = 2.8224 MHz MCLKI

    128 x fs = 5.6448 MHz MCLKI

    256 x fs = 11.2896 MHz MCLKI

    384 x fs = 16.8344 MHz MCLKI

    Regarding the GPIO question, yes you can use DC Input blocks.  You can refer to the following application note "Using Hardware Controls with SigmaDSP GPIO Pins"

    Here is an nifty example of using DC Blocks and GPIO Pins 6 to 11 for a volume meter on the ADAU1701.

    -JT

    "
    guest replied
    4 Years

    Dear Dave

       The problem is for the part number is ADAU1701, could you help for this problem ASAP, thanks

    guest replied
    4 Years

    Hello Xun,

    I am not sure which datasheet you are looking at. The ADAU1761 datasheet serial ports are detailed on page 42 and does not mention sampling rates. If you are referring to the rates listed in the converter control register 0x4017, those rates shown are based on the base sample rate of 48 kHz. If your base rate is 44.1 kHz then all the samples rates shown will scale the same amount. 48 kHz * 0.91875 = 44.1 kHz. So they will all scale the same.

    You should also read the Sampling Rates section of the datasheet. Page 27. This should help.

    Regarding your question about the GPIO. I will have to look into this for you.

    Thanks,

    Dave T

    guest replied
    4 Years

    Sorry  the part number is ADAU1761

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