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Original question:

TPA3111D1: 5W instead of 10W output power

TPA3111D1: TPA3111D1 input clarification.

Arunkumar
Intellectual 330 points
Part Number: TPA3111D1


Hi,

I am planning to use the TPA3111D1 amplifier in my design. I was going through the datasheet and find the below description.

What it means biased at 3V? 

I will connect the audio codec Lineout to this amplifier input pin. The Lineout output typical rms voltage is 1 Vrms. Will this be fine to connect like this?

Thanks,

  • 0
    TI__Mastermind 28100 points

    Hi Arunkumar,

    For some reason that screenshot you attached isn't viewable for me. But based on context I'm assuming you are asking why the inputs are biased at 3V? 

    The reason for this is to avoid saturating the inputs of the amplifier. We have to bias our inputs since we don't have a negative voltage rail. It's a similar concept as a single supply operational amplifier. You have to have a bias point to avoid clipping the signal. 

    Based on your description of your system, I don't see any potential risks with connecting the audio codec lineout to the amplifier's input as long as you still have the DC blocking capacitor between them. 

    Best Regards,

    Robert Clifton