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ADS54J42 Filter Coefficient & other JESD204B Usecase

Alber, Moon
Intellectual 720 points
Other Parts Discussed in Thread: ADS54J42

Hello
I'm Alber as a FAE in Arrow Korea
My customer are testing the ADS54J42.
They have 2 questions about ADC architecture.

1. coefficient values of each filter in DDC block(LPF, HPF, BPF, IQ LPF)
  - Would you please let me know each coefficient values in detail?

2. can they use following setting?
  - FPGA input Sampling Rate : 300Msps(Real)
  - DDC Mode in ADC : Bypass
  - JESD204B LANE use : 2 Lane(1Lane/Channel)
 
  - There's no use case on datasheet using both DDC bypass mode and 2Lane.
  - Only 2 Lane connected between ADS54J42 and FPGA on their board now.
  - They want to receive whole 150MHz BW without any BW rejection for DPD function(3x BW of 50MHz signal BW)
    (Feedback center Frequency is fixed at 225MHz)
  - If possible, what frequency have to take in the clock input port?, and would you please let me know how to set the ADC's register?


Please, they are ungent now, I look forward to get a feedback quickly.

  • 0
    TI__Guru* 91947 points

    Alber,

    I am working on getting you the answer to these ASAP.

    Regards,

    Jim

  • 0 in reply to jim s
    Intellectual 720 points

    Hi, Jim

    Would you please give a feedback whether use available or not?

    If not, they have to change the whole architecture (clocking, sampling rate, IF CF and so on)...

    As I mentioned, they are very urgent to get a TI's feedback.

    And if you have any question about this issue, please ask me anytime.

    Thanks.

  • 0 in reply to Alber, Moon
    TI__Guru* 91947 points

    Alber,

    We can only share filter response. Revealing filter coefficients may not be possible since we would need to explain filter architecture in that case.
    Why does customer need the coefficients?

    I am still waiting on answers from the design team regarding the other question.

    Regards,

    Jim 

  • 0 in reply to jim s
    Intellectual 720 points

    hi, Jim

    I understand that you can't share the filter coefficient due to asking other questions from customer.

    They just want to double-check the filter response in detail.

    I will say that this situation to customer.

    Anyway, they need to get the TI's feedback whether using the configuration setting available or not .

    Please get the answer quickly from design team.

    Early I mentioned, they are very urgent.