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THS6226 design issue

Lucifer
Expert 2600 points
Other Parts Discussed in Thread: THS6226

Dear Sir,

I got a  project for 4-port DPU design need your hlep.

 

1. Channel AB's SNR is better than Channel CD's. I need to get some suggestion from you.

- loop length = 0m, 200m, 250m.

 

2. For programming, our AFE will control the LD directly and how do I verify it? I mean there is a way to know the status of THS6226?

 3. For power-down mode, the THS6226 is not controlled by our AFE and then, it will be set to power-down mode, right? 

- DATA = low level, CLK = low level.

 

 

Besides, is there any design guide document for user? Like PCB layout notice or something else.

 

  • 0
    TI__Genius 13935 points
    Hello,

    I looked over the datasheet and the device pinout and I do not see any way to read data back from this amplifier.

    There is no EVM available on our web page at this time. I will ask and see if there are any internal documents that would help you design a board for this part.

    Regards,
    Loren
  • 0
    TI__Genius 12631 points

    Hello,

    1. I cant explicitly tell you why the SNR of one channel is better than the other. Issues like this usually come down to something in layout, power supply bypassing or cross-talk with adjacent channels . I am attaching an altium design file of the PCB we used for testing the THS6226. Please use that as a reference to compare with your design and check for obvious differences. Pay close attention to the plane layers that carry power and GND as well.

    2. There are two possible ways to check if you are in the correct mode - use a small sense resistor or a current-shunt monitor to check the quiescent current. If this is not possible then see if you can use the AFE to do a frequency sweep of a few points to check the results shown in figure 2 and 3. This way you can do a relative comparison. Another method is to use a single frequency and check the harmonic distortion performance. You will need a spectrum analyzer to make the measurements. As you go into lower power modes the HD performance is going to degrade. This is another "relative performance" test.

    3. The THS6226 is in power-down mode on startup. If you are in one of the active modes and then just float the input pins - will the device go into power-down mode? Is this your question?

    Hope this answers some of your questions.

    -Samir

    THS6226 REV.A.zip