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TLV320AIC3104: Impedance matching in TLV320AIC3104-EVM-K

Aditya Padekallu
Prodigy 60 points
Part Number: TLV320AIC3104
Other Parts Discussed in Thread: TAC5212,

Tool/software:

Hi,

I'm working on an audio project in which I'm facing a problem : my impedance of codec is 16 ohms, I'm using the receiver IP30 from Radio Ear whose impedance is 10 ohms. I need to match the impedance for better performance. Tell me related solution for this problem.  If using a buffer amplifier can be the solution for it then suggest me an IC as well.

Regards,

Aditya

  • 0
    TI__Genius 12455 points

    Hi Aditya,

    Can you switch to a different codec? The TAC5212 has a minimum output headphone load of 4 ohms, so it would work with your 10ohm headphone load. Then you would not need a second chip to convert the impedance.

    Best,
    Mir

  • 0 in reply to Mir Jeffres
    Prodigy 60 points

    Hi,

    No, we don't have an option to change the CODEC. We have to use TLV320AIC3104. 

    Regards,

    Aditya

  • 0 in reply to Aditya Padekallu
    TI__Genius 12455 points

    Hi Aditya,

    Okay, let me ask my coworkers if we have done something like this before. Are you experiencing worse performance when you connect the 10ohm receiver to the output of the codec?

    Best,
    Mir

  • 0 in reply to Mir Jeffres
    Prodigy 60 points

    Hi, 

    When I connect earphones directly to headphone out jack, I get a better volume and when I connect receivers, then the volume is bit decreased.

  • 0 in reply to Aditya Padekallu
    TI__Genius 12455 points

    Hi Aditya,

    My coworker suggested to connect the codec to an external audio amp that would be able to drive a lower impedance load. The issue with driving your 10ohm receiver from the AIC3104 is that if the codec expects 16ohm minimum output, your receiver will draw more current and potentially shut off the driver on the AIC3104, or just the driver will not be able to supply enough current and then your speaker output is quieter as you observed. An amp with a high input impedance will not have this drive issue with the AIC3104, and if it is able to supply enough power/current to the low impedance speaker, then you should not have problems with volume/quality. One cheap amp that you could look into is the TPA2011. You can connect the analog out from the codec to the input of the amp, and the output of the amp to your receiver.

    Best,
    Mir