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TAC5112-Q1: TAC5112-Q1 / Differential Audio codec to MIC circuit verification -reg

Krishna K
Prodigy 10 points

Part Number: TAC5112-Q1

Hi, 

In datasheet of TAC5112-Q1 / Audio codec,

1) I see that for Mic input AC coupling the MICBIAS pull up and Gnd Pull down is available after the AC coupling capacitot. Is it right?

I suppose it needs to be provided before the capacitor closer to the IC pin Can you please confirm ?

image.png

Also, I would like to know 

2) The specification of the Mic that can be connected to this Codec?

3) I need to understand the difference between Stereo differential and Stereo single ended can you suggest some reference documents for the same. What is the dependency for selecting between the both? 

4) How to calculate the analog amplifier wattage required for my application? I donot know the wattage of the speaker yet. I suppose it is an array speaker. Please advise 

 

Awaiting your quick support

  • 0
    TI__Guru 50180 points

    Hi Krishna,

    1) No, the diagram is correct. MICBIAS is provided to power up ECM mics connected to the analog inputs. The device self generates an ADC center voltage on the input pins, and so the MICBIAS connection must be on the MIC side of the AC coupling cap to prevent contention.

    2) The device can accept any analog signal. Specs for the mics will depend on your application need. 

    3) Differential means that the input of the ADC is taken as IN1P - IN1M. Some sources such a differential line amps have differential outputs. Many microphones are single-ended, where IN1M is AC coupled to GND rather than an input source, and the ADC only considered IN1P as the input.

    4) I don't know what your application is and so I can't inform you of an output wattage. "Array speaker" can be many things.

    Best regards,
    Jeff McPherson

  • 0 in reply to Jeff McPherson
    Prodigy 10 points

    Hi  , 

    Thanks for the response,

    Regarding the query

    1) So, here is another application circuit where the MICBIAS connection is before the AC coupling cap. Just wondering why this difference, both seem to be the same topology (single ended mono).In stereo MIC input also, I see the MIC bias before AC coupling only.

     

    4) The application here is the car inbuilt speaker. I do not know how the speaker array is connected in car. Is there any standard connection? and I would like to know the usual wattage range as well if you may know? This is to select the required analog amplifier for the Speaker output from CODEC

  • +1 in reply to Krishna K
    TI__Guru 50180 points

    Hi Krishna,

    1) The TAC51xx and TAC52xx devices self bias the ADC, and so the AC coupling cap should separate MICBIAS from the input pin. TAC53xx and TAC54xx does not self bias the ADC, and MICBIAS is used as that bias instead.

    4) You're probably looking at 20W-30W. I would recommend finding an amp you think might work for you and creating a new e2e post about it to double confirm. The teams that support the codecs and the amps are different so I can't provide a good recommendation for you unfortunately. But the amp team can do so easily.

    Best regards,
    Jeff McPherson

  • 0 in reply to Jeff McPherson
    Prodigy 10 points

    Thanks Jeff, for the prompt support.