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ADS52J90 About JESD204 setting by internal register

masahiko shimizu
Guru 11235 points
Other Parts Discussed in Thread: ADS52J90

Hi,

My cutstomer has question below.
Could you give me answer, please?

Q1: There are "Register 85" and "Register 115"
      Which setting is priority high?
     Customer uses JESD204B subclass1.
     Which mode does ADS52J90 become when "Register 115"(ENABLE_JESD_VER_CONTROL=0) is set to 0 and "Register 85" is set to JESD204A?

Q2: Is there the way to distinguish of "JESD204A or B" and "subclass0 or 1" expect seeing internal register?

Q3: At JESD204B subclass1, Can ADS52J90 send data by only using SYNC, not using SYSREF?

Best regards,
Shimizu

  • 0
    TI__Mastermind 18285 points
    Shimizu,

    We have received your post and assigned to the correct applications engineer. You should have a response soon.
  • 0
    TI__Expert 6320 points

    Q1: The default of the device is JESD204B-sublass 1, this will be the mode until ENABLE_JESD_VER_CONTROL=1. If ENABLE_JESD_VER_CONTROL=1,  then the device takes the new version configuration.

    Q2: The big difference between subclass 0 and 1 is the deterministic latency and the timing signal, which is difficult to see in the output data.

    Q3: No, this is not recommended with subclass 1, but only subclass 2.

  • 0 in reply to Chuck Smyth
    Prodigy 10 points
    Excuse me, I encountered a problem with ADS52J90.
    DESCRIPTION:
    I tried to monitor the digital signal on data lanes with a hi-performance oscilloscope, but there was nothing.
    (ADC config: sampling clk 12.5MHz, 2 ADCs/lane, JESD204A, TESTMODE:consecutive D21.5 string; Schematic confirmed correct.)
    I readback registers, they were same as what I wrote in.

    QUESTION:
    How can I confirm that JESD204 digital output is active?
  • 0 in reply to Ricyn Lee
    TI__Expert 4145 points
    Hi Ricyn,

    Please open a new thread if you have a question you want answered--this thread was closed a while back.

    Sincerely,
    Olu