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TPA3251: Which way is better when SE to DIFF stage circuit is placed as close as TPA3251 board or signal board

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Replies: 6

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Part Number: TPA3251

Hi Team

 My customer design a audio amplifier,  they have two board: signal and speaker amplifier board. 

Customer can't confirm  Which way is better  when SE to DIFF input stage circuit is placed as close as TPA3251 board or signal board. Can you give some suggestion ? thanks 

  • Hi Aggil,

    We've never tested placing the SE to DIFF input stage circuit at different distances. As long as the signal route has minimized picking up any additional noise from the system or environment then I don't foresee issues with how far the op-amps are placed relative to the audio amplifier, within reason.

    Best Regards,

    Robert Clifton 

  • In reply to Robert Clifton56:

    Dear Robert

     If the GND of  signal board and amplifier board don't be tied together, is there any influence when the SE to DIFF stage circuit be place different board ?

  • In reply to aggil liang:

    Hi Aggil,

    Why aren't the signal board's and amplifier board's ground being tied together?

    Regards,

    Robert Clifton

  • In reply to Robert Clifton56:

    Dear Robert

         Which way of PCB LAYOUY  is better?  Is it ok if I choose the second way

    TPA3251_LAYOUT_COMPARE.pdf

  • In reply to Robert Clifton56:

    Hi Robert

     Only a assumption.

  • In reply to aggil liang:

    Thank you for showing me the system Dunhai!

    Both methods are vaild. While I believe option one will likely have lower noise floor, if good routing practices and ground pour techniques are used, option 2 appears should give similar results. 

    Best Regards,

    Robert Clifton

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