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PGA970: PGA970 ADC read Problem

Intellectual 330 points

Replies: 4

Views: 63

Part Number: PGA970

Hello,

Can anybody an help me in below issue. I am using PGA970EVM board.

How can I read ADC data from DEMOD1_DATA1, DEMOD1_DATA2, DEMOD1_DATA3, DEMOD1_DATA4 ?

Thanks and Regards

VAI

  • Hi Vai,

    The PGA970EVM GUI user's guide (http://www.ti.com/lit/ug/sldu023/sldu023.pdf) gives instructions for how to use the ADC Settings page.

    In short you have to enable the VREF buffer, turn on the Analog Power, enable DEMOD1, Test Mux Enable, and the Interfaces & Deci Clk, and finally make sure the Sigma Delta Modulators and the Modulator Clock are set to "Not Reset".

    Then you can click "Read ADC" below the ADCx data table and the values will populate in the table.


    Regards,

    ____________

    Scott Cummins

    Precision ADC Applications

  • In reply to Scott Cummins:

    Dear Scott,

    I am trying to generate the sine wave through firmware for 50Hz frequency.

    what are  the hex value should we pass to generate sine wave for accurate as well as stable primary excitation output.

    I only want the hex value table.

    Regards,

    VAI

  • In reply to Vai:

    Hi Vai,

    I'm not sure I understand. Your latest question seems unrelated to the original question of this post. Was your original question answered? If so, and this is a new question please let me know and I can split this off into its own thread.

    Regards,

    ____________

    Scott Cummins

    Precision ADC Applications

  • In reply to Scott Cummins:

    Dear Scott,

    My first question was not able to read ADC value through firmware not PGA970 GUI software.

    I am using PIC controller to read data through SPI of PGA970 .

    Please help me to how to read data through SPI also please answer the above query also.

    Reading through PGA970 GUI software has been done now current i am working on firmware.

    Kindly give solution as soon as possible,

    Regards,

    VAI