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Original question:

AFE7422EVM: LMK Lock doesn't happening when setting AFE into Mode 4

AFE7422EVM: Cannot see the capture from AFE7422EVM ADC in Mode4

Eugene Kim
Prodigy 30 points

Part Number: AFE7422EVM

Hello,

I have a next issue with AFE7422 EVM.

I'm trying to bring up AFE7422  together with TSW14J57EVM. I have successfully passed through video#3: How to configure the AFE74xx DAC in Mode 4 using the internal PLL and now I'm able to see a tones at the DAC output on my spectrum analyzer.

But when I moving forward trying to replicate the actions from video #4 (How to configure the AFE74xx ADC in Mode 4 using the internal PLL) I cannot see anything captured from the ADC. This is what I see after pressing "Capture" button:

As it is mentioned in the bringup video I have tried to press this button:

and pressed "Capture" again, but it doesn't help.

Additional question:

In the bringup videos I see that the spectrum analyzer is connected to J23 IOUTB:

But I see the output tones at the J22 IOUTA - is that normal?

In a connection to this, I have tried to connect an input signal (from my RF signal source) to both A_IN1 and A_IN2 but no any capture received.

Please help to understand what we doing wrong.

Regards,

Eugene 

Please help to understand what I doing 

  • 0
    Prodigy 30 points

    Update: 

    I can see a signal when connecting input RF signal to B_IN1 and switching this control to "Channel 3/8" or "Channel 4/8":

    Also I can see a signal when connecting input RF signal to D_IN1 and switching this control to "Channel 7/8" or "Channel 8/8":

    But I see nothing when this control is set to Channel 1/8, 2/8, 5/8 and 6/8. Why is this so?

    Regards,

    Eugene

  • +1 in reply to Eugene Kim
    TI__Genius 13850 points

    Hi Eugene, 

    The reason you are seeing data on half the channels is because the AFE7422 is a dual channel device and the ini file also supports the quad channel AFE7444.

    The AFE7422 will have RxB and RxD active for the Rx side. Channels 3/4 and 7/8 in HSDC Pro correspond to the I and Q data of RxB and RxD. On the Tx side you will see an output on TxA and TxC.

    Regards,

    David Chaparro