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TLV320AIC3204: TLV320AIC3204

Namith HL
Intellectual 570 points
Part Number: TLV320AIC3204
Other Parts Discussed in Thread: TPA3123D2, TLV320AIC32, TLV320AIC3105

Helllo, 

We are planning to use TLV320AIC3204 Audio codec and TPA3123D2 stereo amplifier from TI .

I have attached  schematic that shows both codec and amplifier Interfacing .

Kindly review it and let me suggest any thing missing in this circuit.

I have less experience in audio section , following are my doubts:

  • how to connect amplifier LEFT AND RIGHT channel to audio codec  but this codec contains 

LEFT_LOP
LEFT_LOM
RIGHT_ROP
RIGHT_ROM

Since amplifier contains LEFT and RIGHT pins in IC .

I have connected LEFT_LOP and RIGHT_ROP (LEFT AND RIGHT plus) to amplifier. IS it correct?

  • We have to connect dynamic MIC to codec  but i have doubt on mic and Headphone pins according to datasheet.please suggest where to connect dynamic microphone to codec

AUDIO CODEC and AMPLIFIER INTERFACE FOR TI REVIEW .pdf

  • 0
    Intellectual 570 points
    Hello,
    we have another query can we analog input voltage to the input channel?
    what is the input voltage range of this channel?
  • 0 in reply to Namith HL
    TI__Guru 57800 points

    Hi, Namith,

    I have noticed the device you have in your schematic is not the one mentioned in the post, you are using a TLV320AIC32, not the 'AIC3204. Do you have a special reason ot select the 'AIC32? this is a quite old codec and right now we have devices with better performance and more system integration features.

    For the 'AIC32, the outputs are configured to operate in a fully differential, mode, which is different than the Single-ended inputs supported by the amplifier. If you are not using the headphone outputs, I would recommend to connect them instead of the differential line outputs, the HP drivers can be used as line drivers.

    The mic can be connected to any of the analog inputs, just consider that you need to provide a micbias voltage. I think you should be able to configure the codec via I²C to disable the mic input, I have't seen an application where a switch is used to disable the mic; actually, turning the mic on and off with the method you are targeting might result in audio artifacts if the input driver is not muted/disabled.

    We recommend to connect the unused inputs to GND through a cap. for the unused outputs, you can leave them floating.

    The maximum analog input the device supports before having damage is –0.3 V to AVDD+0.3; but we recommend a maximum input signal of 0.707Vrms, as indicated in the Recommended Operating Conditions  table of the datasheet.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Intellectual 570 points

    Thanks for feedback,

    can u suggest suitable Codec with same input and output.

    regards,

    Namith

  • 0 in reply to Namith HL
    TI__Guru 57800 points

    Hi, Namith,

    Any codec with Single-ended line output drivers could work, actually, the TLV320AIC3204 mentioned might be a good option.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Intellectual 570 points

    Audio codec and stereo amplifier for TI review.pdfHi,

    As your feedback i have changed my circuit. kindly review my schematic and suggest me if any wrong thing are there.

    I have limited knowledge on audio ,please verify my schematic and reply me as earliest.Also we have provided hardware jumper for disabling the on board mic.

    Regards,

    Namith HL

  • 0 in reply to Namith HL
    TI__Guru 57800 points

    Hi, Namith,

    I reviewed the schematic and in general have the same suggestions:

    • Connect the unused inputs to GND through a cap
    • Mic can be disabled by HW, but please make sure that internally the input MIC1 is not connected to the ADC to avoid unexpected noise.  
    • HPLCOM and HPRCOM should be left floating.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Intellectual 570 points

    Hi,

    we have selected CODEC TLV320AIC32IRHBT and designed schematic for this part, 

    But our customer saying this part is too costly ,suggest us find out alternative solution.

    Please suggest suitable CODEC with low cost as possible.

    • Our requirement: sampling frequency upto 96KHZ

    I have limited knowledge on codec .please reply me as earliest

    Note:current codec cost is around $8

    Regards,

    Namith HL

  • 0 in reply to Namith HL
    Intellectual 570 points
    Hi,
    I have seen this part: TLV320AIC3105 which is pin pin compatible to TLV320AIC32IRHBT and supply voltage ranges are also equal.
    price also less .

    can u please suggest what is the major difference between these two parts.
    Regards,
    Namith
  • 0 in reply to Namith HL
    TI__Guru 57800 points

    Hi, Namith,

    As I mentioned before, the AIC32 is a quite old part and now we have better codes in overall system-integration tools and performance. The AIC3105 is a good device to consider, the difference with the AIC32 is mainly on the performance and register settings.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Intellectual 570 points

    Hi,

    what is the voltage levels ratings of  mic inputs?

    we have Preamplifier for microphone ,whose output swings from +5V to -5V .

    Regards,

    Namith

  • 0 in reply to Namith HL
    TI__Guru 57800 points

    Hi, Namith,

    For the AIC3105, the maximum input signal level is 0.707Vrms, you need to condition the output of the pre-amplifier to match this level in order to avoid damage to the codec. Also, one thing to mention is that this device accepts direct connection to microphone as it integrates a PGA in the front end of the ADC, so you might also consider to not use an external pre-amplifier.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Namith HL
    Intellectual 570 points
    Hello,
    Our customer needs Pre amplifier for dynamic microphone , can u suggest signal conditioning circuit for limiting codec input range i.e 0.707 VRMS.
    Regards,
    Namith HL
  • 0 in reply to Namith HL
    Intellectual 570 points
    Hi,

    Can the CODEC take bipolar input or only single ended input of 0.7V, we are not clear on this. Can you suggest a solution for limiting the audio signal to 0.7V without affecting the signal. can you give us a solution for this. Attached is the updated schematic of the section.
  • 0 in reply to Namith HL
    Intellectual 570 points

    Hi,

    Can the CODEC take bipolar input or only single ended input of 0.7V, we are not clear on this. Can you suggest a solution for limiting the audio signal to 0.7V without affecting the signal. can you give us a solution for this. Attached is the updated schematic of the section.

    sorry missed the attachment.

    Regards,

    NamithAudio codec and Pre amplifier for TI review.pdf

  • 0 in reply to Namith HL
    TI__Guru 57800 points

    Hi, Namith,

    The input value accepted by the ADC of the AIC3105 in Single-ended mode is 0.707Vrms, this voltage equals to a signal with a peak to peak voltage of 2V.  The decoupling cap will remove the DC content and will couple the signal into the ADC common mode voltage (CM).  

    I am not aware of a specific solution, but have seen some circuits with an attenuating operational amplifier, in other cases I have seen just a resistor network.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Namith HL
    Intellectual 570 points

    Hi,

    Please share layout guideline document or link for TLV320AIC3105 .

    we are awaiting for reply.

    Thanks&regards,

    Namith

  • 0 in reply to Namith HL
    TI__Guru 57800 points

    Hi, Namith,

    The layout guidelines for the AIC3105 are mentioned in the datasheet of the device, please refer to section 13.

    Also, you can take a look to the AIC3105 EVM User's Guide, where the layout of our EVM is available.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer