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TPA2011D1: What's the total gain when the input is the sum of two single-ended signals?

Roy Hsu
Genius 9350 points
Part Number: TPA2011D1


Hi Team,

As title, what's the total gain when the input is the sum of two single-ended signals? The datasheet only specifies Gain1 and Gain2.

Thanks!

Roy Hsu

  • 0
    TI__Guru** 110765 points

    Hi Roy,

    The gain for each input is different in this case.

    The gain is a relation between input and output signals, so it can be different for each one if input resistors are different. The amplifier gain would depend on which signal you consider as the input.

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

  • 0 in reply to Ivan Salazar
    TI__Genius 9350 points

    Hi Ivan,

    Thanks for getting back but I think it is still not 100% clear to me.

    Let's say we have single-ended input 1 V1 and single-ended input 2 V2. The corresponding gains are Gain1 and Gain2.

    What will we get across Vo+ and Vo-? Will it be (V1*Gain1 + V2*Gain2)?

    Thanks!

    Roy Hsu

  • 0 in reply to Roy Hsu
    TI__Guru** 110765 points

    Hi Roy,

    Yous assumption is correct. Each input has its own gain so the output will be the sum of each input signal multiplied by the gain times.
    Take into account that the sum is a mixing, not a linear addition.

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