This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS90UB929-Q1: cable requirements under high PCLK

Part Number: DS90UB929-Q1
Other Parts Discussed in Thread: DS90UB941AS-Q1

Dear team,

Below is the screen's specs, the resolution is 1920*720@60fps.

Question 1: Before my customer uses 949 & 948 solution. In order to reduce cost, they want to know whether 929&948 solution is ok. 929's max PCLK is 96MHz. If they use Typ. spec(PCLK=44.1*2<96MHz), 929&948 solution should be feasible, right? 

Question 2: Using below same screen, they want to use 1*941AS(splitter mode)& 2*948 to bring 2 screen as the second picture. 941AS's single channel ups to 105MHz, and 948's single channel ups to 96MHz. The screen's typ. PCLK is 44.1*2 which is smaller than 96MHz, so this solution is feasible, right?

Question 3: Single channel's PCLK is around 90MHz which is large, so do we need to suggest customer to use STQ cable instead of STP/Coax considering return loss, insertion, Impedance mis-match ans so on?

Thanks & Best Regards,

Sherry

  • Hello Sherry,

    1. 929 can support this resolution with the typical spec which is < 96MHz 

    2. Yes this is possible and several customers have implemented it already to send 2x 1920x720@60 screens using DS90UB941AS-Q1. The same 96 MHz limit applies here when using 948 on the DES side

    3. For single link, the cable would be STP or coax. That would be used for 941AS or 929 in the solutions above. Either configuration is acceptable so long as reasonable quality cable is used, and the PCB/connector design follows TI best practices. 

    Best Regards,

    Casey 

  • Hi Casey,

    Thanks for your reply!

    I am not very clear about TI best practices. For PCB, it means our layout recommendation in the datasheet, right? For connector, could you please give me some guideline materials?

    Thanks & Best Regards,

    Sherry

  • Hello Sherry,

    Yes, please follow the datasheet guidelines for layout best practices. For the connector, you can reference the EVM schematic/BOM online for component selection, and finally you can consult with us for layout review once the design is done as well. 

    Best Regards,

    Casey 

  • Hi Casey,

    Got it! Thank you!

    Best Regards,

    Sherry