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Working on new XMOS audio + TI TAS5766M Design, brand new. Quick questions

Garrick88
Prodigy 140 points
Other Parts Discussed in Thread: TAS5766M, TAS5768M

Hi,

I have a board with an XMOS chipset with (8)  I2S mems microphones in, and I want to add an I2S output amplifier next.

My speaker system is (2) 4 ohm speakers (our mids and lows) in series (for 8 ohm) on one channel, and (1) 4 ohm tweeter. on the other channel. We want a "mono" speaker, have extreme size constraints, and this system gives the greatest loudness over our desired frequency possible. We 3D printed a system and drove it with discrete hardware and it sounds great.

Does anyone see an issue with driving half of the TAS5766M into a 4 ohm load and the other into 8 ohm? We will have a digital cross over and will balance the power output appropriately.

With such a disparity between power that will be required on one channel (two woofers) vs. the other channel getting the tweeter, any issues with the device TDP?

If I don't have a heatsink, will the TAS5766M perform similarly to TAS5768M?

Since I am planning to use the TAS5766M or TAS5768M. I guess I'll route the digital out of the amplifier back to the XMOS in case our software people could take advantage for echo cancellation. We already do echo cancellation through audio captured by the microphones, but this is another data source. The XMOS can handle another I2S channel in.

Anyway, I'm new to designing a speaker amplifier, so any issues with this setup or gotchas people might foresee would be greatly appreciated.

Thank you.

  • 0
    TI__Guru 57800 points

    Hi, Garrick,

    Sorry for the delay, My colleague is looking into this and will contact you soon with his comments.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    TI__Guru 52115 points
    Hi Garrick,

    Are you using the PPC3 GUI to do the tuning? For now, the PPC3 GUI only supports stereo applications and we assume one TAS5766M device is driving two identical speakers.

    Andy
  • 0 in reply to Andy Liu (BMS)
    Prodigy 140 points
    Hi Andy and Diego, thank you for the replies.

    I've requested download of the PurePath software. I had not seen that before.

    Could I use the software to just tune one channel at a time?

    Thank you again,
  • 0 in reply to Garrick88
    TI__Guru 52115 points
    Hi Garrick,

    No. Two channels are tuned at the same time in PPC3 and the equalizers are shared.

    Andy
  • 0 in reply to Andy Liu (BMS)
    Prodigy 140 points
    Thanks Andy.

    So, does TI recommend we either tune the speakers our selves (create an educated guess), or should i go with two discrete devices? Perhaps (2) TAS5766M devices, as a Mono/PBTL Application shown in Figure 59? I would still want to have (1) stereo I2S channel diving both amplifiers, so sharing BCLK and DIN, but what could I do with the LRCLK? It looks like this won't work, and I'll have to generate too I2S channels, and make them both mono. I think we can do that.

    Also, I'd like have the I2S feedback from each device. The I2S channel count keeps climbing.

    This is all to avoid an analog crossover. We have a heavily constrained design and that will be hard.

    Do you recommend any other amplifiers?
  • 0 in reply to Garrick88
    TI__Guru 52115 points
    Hi Garrick,

    We have another TAS5766 smart amp process flow that supports 1.1 system (woofer + tweeter). One problem is that no PPC3 GUI is available for this 1.1 flow yet and what we have now is a Matlab GUI that is for internal evaluation.

    Andy
  • 0 in reply to Andy Liu (BMS)
    Prodigy 140 points
    Okay, if we want to go with a TAS5766 or TAS5768 can I provide TI all of the speaker element details and have you spit out the passive component requirements for me?

    Thank you,
    Garrick