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AFE8030: Synchronous NCO reset

Part Number: AFE8030

We measured the delay between the 8 Tx channels in the oscilloscope and saw different delay between the channels every reset.

We tested it while injecting pulse signal.

It looks like there is some kind of ~ 100nsec between the channels every reset.

After reset #1:

 

After reset #2:

After reset #1:

  

Can you please think of a reason why it happens ?

Because it should be very repeatedly.

  • The NCO is reset using the sysref signal. If the NCO frequency is an integer multiple of sysref frequency, the NCOs will be phase synced. So, in order to achieve a synchronous NCO reset, please set the NCO frequency to an integer multiple of the sysref frequency.

    Please set fNCO = N * fSYSREF = N * 1.92 MHz.