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TPA6211A1-Q1: Input resistance RI and cap CI for single ended configuration

NOBUO FUJIHARA
Genius 9425 points
Part Number: TPA6211A1-Q1
Other Parts Discussed in Thread: TPA6211A1

Hi Team,

My customer will use TPA6211A1-Q1 with single ended configuration.

In this configuration,

Q1) CI in IN+ node has to be the same value as CI of IN- node?

Q2) RI in IN+ node has to be the same value as RI of IN- node?

Best regards,

  • 0
    TI__Guru** 111585 points

    Hi Fujihara-san,

    Yes, the input components for both inputs should be the same value.
    When single-ended input is used, it is very important that the inputs have the closest impedance match to each other as possible. Keeping the same component values is a good practice, although the capacitor could be fine adjusted by testing the pop performance across different values, if necessary.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • 0 in reply to Ivan Salazar
    TI__Genius 9425 points

    Hi Ivan-san,

    Thanks a lot for dedicated answer.

    Best regards,

  • 0 in reply to NOBUO FUJIHARA
    TI__Genius 9425 points

    Hi Ivan-san,

    Customer asked further questions about following sentence in your previous answer,

    "although the capacitor could be fine adjusted by testing the pop performance across different values,".

    Could you provide detailed information about "Pop performance test" with TPA6211A1?

    Best regards,

    Nobuo Fujiahra

  • 0 in reply to NOBUO FUJIHARA
    TI__Guru** 111585 points

    Hi Fujihara-san,

    Pop noise is a subjective measurement. It is a "pop" or "click" like noise that occurs when enabling or disabling some amplifiers. Some people hear it better than others, and it is also relative to the distance between the speaker and the ear.
    Sometimes, in order to make it quantitative, a scope or an audio measurement tool is used to measure the transient that occurs during power up or power down.

    In some cases the capacitor value at the inputs can affect this "pop" transient.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators