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AFE7950EVM: How to change phase offset of individual channels on AFE7950EVM.

AK
Prodigy 250 points
Part Number: AFE7950EVM


I know that NCO phase offset, 16-bit registers are there, which can be programmed. But for evaluation purpose I need to check it on EVM using Latte and HSDC. Is it possible?

  • 0
    TI__Genius 10875 points

    Hi AK,

    To evaluate NCO phase offset programming for RX (ADC) channels, you can follow below steps:

    1. Set two RX channels to same NCO frequency and input a single tone to both channels using a power splitter.

    2. Capture the ADC output in HSDC Pro, in single tone parameters, note fundamental phase for both channels and calculate the difference in phase between the two channels.

    3. Now update the NCO phase of one the channels, and repeat step 2, you should see the phase difference change by the amount of NCO phase changed.

    For TX (DAC) channels, you can use a multi channel high speed scope to capture two channels and use one of the channels as reference to evaluate the NCO phase offset programming.

    Regards,

    Vijay