• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 267 views
  • Users 0 members are here
Support feedback
Options
Options
Related

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.

ADC32RF55: Analog input trace length for PCB design

Sayaka Kose
Prodigy 40 points
Part Number: ADC32RF55
Other Parts Discussed in Thread: , LMH5401

Tool/software:

I am designing a PCB pattern for a circuit using an ADC32RF55.
Like an ADC32RF55EVM, I am trying to input an analog signal from the SMA connector and connect it to the ADC via the analog front end.
The wiring length from this input connector to the ADC is supposed to be short. How short should it be? The EVM is about 15 mm, and my current design is about 17 mm.

Is this value reasonable?

Thank you.

  • +1
    TI__Mastermind 42420 points

    Hi Sayaka,

    Yes, 17mm is fine.

    If you give us more details on your setup or layout, we can help guide you appropriately.

    Thanks,

    Rob

  • 0 in reply to Rob Reeder
    Prodigy 40 points

    Dear Rob,

    Thank you for your reply.
    A single-end analog high-speed signal (approx. 2~3 GHz) input from the SMA connector is amplitude-adjusted by a single-end differential conversion operational amplifier (LMH5401), and then connected to the ADC32RF55 via an RC filter.
    The path from the connector to the amplifier is about 14 mm, and from the amplifier to the ADC is about 4 mm, a total of about 18 mm, so I wanted to know if this is appropriate.

    On the other hand, how long is acceptable?

    Thanks,

    Sayaka

  • 0 in reply to Sayaka Kose
    TI__Mastermind 42420 points

    Hi Sayaka,

    Thank you for your patience. This connection strategy seems fine.

    That is a trick question, an acceptable length is equal to how well your board and design can maintain a good match between the two interconnections.

    Regards,

    Rob