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ADS42JB69EVM: Changing sampling frequency

Bill Randle
Prodigy 100 points
Part Number: ADS42JB69EVM
Other Parts Discussed in Thread: LMK04828, ADS42JB69

I have a question with using the ADS42JB69EVM with the TSW14J56. I have High Speed Data Converter Pro v4.50, ADS42JBx9 GUI (8/15/13) and the Clock Design Tool software installed.

My question is how to change the sample clock frequency. In the HSDC Pro program, I can set the ADC Output Data Rate, and it displays a message to set the ADC clock to match. I know setting the ADC clock is done via the ADC GUI tool, but how to determine the new values? It appears the recommended method is to use the Clock Design Tool. To get a baseline, I tried setting output frequency in the design tool to match the default value set by the ADC GUI (250 MHz), which results in VCO settings that don't match what the GUI is using. If I manually enter the PLL dividers used by the GUI, the output frequency does not match and some of the boxes turn red (out of range). I would appreciate any guidance from someone who has been through this process before.

    -Bill

  • 0
    Prodigy 100 points
    I have also seen several references in this forum about a newer ADS42JBxx EVM GUI tool, yet I'm not able to actually find it on the TI site. Is it available, or was it killed? (The old link to a Box folder is no longer valid.)
  • 0 in reply to Bill Randle
    TI__Guru* 91947 points

    Bill,

    We are currently updating the User's Guide to reflect this new updated GUI. If you want, you can download this GUI from the link below. This GUI and the updated User's Guide should be on the web in about 1-2 weeks.

    Regards,

    Jim

    txn.box.com/.../0huh4m2y44ulmj0ddf5b3lslbh2bdn5m

  • 0 in reply to jim s
    Prodigy 100 points
    Jim,

    Thank you for the link to the new GUI tool and to the documents! The documents were very helpful, especially second one. In the new GUI tool, I don't see a SYNC button. Is that functionality no longer required?

    The first document (LMK04828 Settings for 122.88MHz clock VCO1.pptx) was a little confusing in places. First, was the document name ("Settings for 122.8MHz clock") - there doesn't seem to be any mention of 122.8 MHz in the presentation. Second, the first (title) page says 245.76 MHz sample clk and page 3 does indeed provide numbers for 246.75 MHz. However, page 2 has a VCO freq of 3072 MHz and you can't get 246.75 MHz from that. Oh, I see it now... with a clkout dev 25, you get 122.8 MHz, so my confusion stems from two different ADC clock setting examples in the same document with the doc name referring to one and the title page the other. Finally, just a minor typo in that same document: the R & N for PLL1 are shown as 10 & 100, respectively, but the equation just below uses 1 & 10. You get the same result, and I figured it out right away but someone else might be confused. I don't meant to be overly picky and I absolutely appreciate the help you provide on this forum to everyone. I merely mention them to possibly help someone else in the future who may see this post and be similarly confused.

    One other piece of feedback: as I mentioned above, I was also playing around with the Clock Tool. I didn't see a checkbox to select the x2 clock multiplier for the PLL2 input (yes, I selected the LMK04828). Not being able to select that makes the numbers off by a factor of 2. You might mention that to the developers of that tool. (It was nice to see the doubler selection in the new ADC GUI tool.)

    -Bill
  • 0 in reply to Bill Randle
    Prodigy 100 points

    I picked the LMK_222_150MHz config from the new GUI, power cycled the TSW14J56 and set its ADC firmware for the ADS42JB69_LMK222 and set the ADC output data rate to 150M. After clicking on the Capture button on the TSW14J56, I get the DDR timeout popup message; D4 is blinking and D3 is on solid. Of more concern (I think), is that D6 and D7 are both on and D8 is off (they were doing that before I started playing with the clock settings). Shouldn't the DDR functionality be independent of the ADC clock?

    -Bill

  • 0 in reply to Bill Randle
    TI__Guru* 91947 points

    Bill,

    There are three of the 150M config files. Make sure you loaded the one with the  "ADS42JB69" in the name. You must press the ADC EVM board reset after power up and before loading the config file. After you load the config file, D1 and D4 should illuminate on the ADC EVM. What version of TSW14J56EVM do you have? After you load the firmware on the Rev D version of this board, LED's D1, D3, and D8 should be on. After setting the sample rate in HSDC Pro then clicking on capture, LED D4 should be blinking as well as the other three mentioned should be on. I just confirmed this with my setup.

    I am guessing your problem is you did not press the board reset on the ADC EVM.

    Regards,

    Jim

  • 0 in reply to jim s
    Prodigy 100 points
    1. Reset ADS EVM
    2. Load Config "ADS42JB69_EVM_LMF222_150M.cfg"
    D1 and D4 are on
    3. Power cycle TSW14J56EVM (it's a Rev D)
    4. Load "ADS42JB69_LMF_222" ADC firmware
    5. Set ADC output freq to 150M and input freq to 10M
    A message pops up saying the JESD frequency should be set to 300MHz (presumably the LMK04828 setup loaded in step 2 did that).
    6. Click Capture - DDR timeout
    D1: on
    D2: off
    D3: on
    D4: blink
    D5: not used
    D6: on
    D7: on
    D8: off

    My understanding is that D3, D6, D7 should be off and D8 should be on.

    All the blue voltage LEDs on the TSW are on and the supply is not current limited.

    -Bill
  • 0 in reply to Bill Randle
    TI__Guru* 91947 points

    Bill,

    The DDR is failing on the TSW14J56EVM. Make sure your 5V supply can provide at least 3A to this board. If so, the TSW14J56EVM is bad.

    Regards,

    Jim

  • 0 in reply to jim s
    Prodigy 100 points

    The bench supply is rated for 3A and the meter said the TSW was drawing 1.5A. Since it's a dual output supply, I connected the other output in parallel (it will do this internally) to provide max 6A at 5V. The DDR lights are still on.

    It was working for a few days when I first powered it on, but I'm guessing from what you're saying the TSW14J56EVM is now bad. That sucks, because I just started using it last week, even though the boards were bought back at the end of September, so the 90 day warranty has expired.

    Thanks for all the assistance.

    -Bill

  • 0 in reply to Bill Randle
    TI__Guru* 91947 points

    Bill,

    Send me your address and I will ship you a replacement one if you will ship the bad one back to me. I will need a phone number along with the address.

    Regards,

    Jim

  • 0 in reply to jim s
    Prodigy 100 points
    Thanks, Jim. PM sent yesterday and the dead one is packed up in it's original box and ready to go on receipt of the replacement.
  • 0 in reply to Bill Randle
    TI__Guru* 91947 points

    Bill,

    If possible, please send it the following address:

    Jim Seton

    Texas Instruments

    12500 TI Blvd

    M/S J2-30

    Dallas, TX 75243

    (214) 567-7283

  • 0 in reply to Bill Randle
    Prodigy 100 points
    Replacement board arrived today and all is good. Everything seems to be working just fine.