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TPA6120A2: About inverting input, non-inverting input and differential input

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Replies: 1

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Part Number: TPA6120A2

Hello, I have some question about inverting input, non-inverting input and differential input settings. First of all, If I want to use inverting input, the output will be negative voltage, so is it better to have a voltage follower with inverted input to create negative voltage and connect to TPA6120A2 (inverted amplifier setting), to create positive voltage output for the headphone, or I can just output negative signal to the headphone?

Also, I would like ask is there any advantages using differential input with regular source, or I need a differential source?     

  • Hi, Jason,

    Welcome to e2e and thank you for your interest in our products!

    Having an inverted output usually doesn't have an effect on the audio. It could be useful for audio cancellation (in case you have an identical uninverted signal). But for audio purposes, it is not noticeable. However, if you require having a positive signal at the headphone output, you can do the solution that you mentioned.

    Regarding your question about the differential input with regular source, there's no risk of having regular source or differential source. I just recommend to respect the recommended operating conditions of the datasheet to avoid damaging the device.

    I hope this helps you. Please let me know if you have additional questions or comments.

    Best regards,
    Luis Fernando Rodríguez S.