Issues with AD9627-150EBZ

I have some issues with your ADC evaluation board AD9627-150EBZ (https://www.digikey.es/product-detail/es/analog-devices-inc/AD9627-150EBZ/AD9627-150EBZ-ND/1762652).

Namely, I am driving the board with the following signals (please find the pictures attached): input.jpg, as the analog input signal, and clk. jpg, as the clock signal for the ADC. At all digital outputs I have similar response, some type of noise without any correlation with the input signal, as shown in response.png. Even with the 0 V analog input I have similar response. I am very confused with this response since the EVB is new. Please let me know if you have any idea what could be the reason for this issue.

Any piece of advice from your side will be highly appreciated. Thank you in advance!

  • 0
    •  Analog Employees 
    on Sep 26, 2019 3:12 PM over 1 year ago

    Hello,

    Not sure if evaluation board is set up for AC coupling using a transformer or balun.  If it is...........................than it is likely that the lower cut-off frequency of the transformer does not support 10 KHz input.  You can check with O'scope to see if signal is appearing at ADC inputs.

    Try setting your analog input frequency closer to 3 MHz and you should likely see the signal appear at the analog input.