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TAS5558 / TAS5548

ben biles
Intellectual 860 points
Other Parts Discussed in Thread: TAS5558, TAS3108, TMS320C5505

HI, I am looking for a way to route / mix 4 I2S inputs down to 1 I2S output L/R ( 8 - 2 mixer ) and would like completely flexible mixing possibility's.

for instance I would like to mix any number of I2S inputs ( left or right channel ) from any of the inputs to any of the 2 outputs.

Can the TAS5558 achieve this or does it just route inputs ( 1 at a time ) and not mix ?


Also this IC seams more geared towards PWM output. Does TI not make a multi-channel Audio Crossbar Mixer IC with more normal analogue differential or digital outputs?

If not, which DSP / codec combination would work well for this digital audio mixer application?

I was hoping to avoid programming coefficients from scratch into a DSP just to a digital audio multi-channel mixing. mainly because I no coefficient programmer!

Any ideas / solutions would be much welcomed :)

thanks, ben

  • 0
    TI__Mastermind 27990 points
    Hi Ben,

    You are correct that the TAS5558 is mainly a PWM modulator with I2S input. There is an SDOUT that you could mix the 8 channels together and output on SDOUT. If you look at the data sheet for the TAS5558 at figure 25, it shows that any of the I2S inputs can be mixed into a single channel.

    The TAS3108 seems to be what you are looking for but it is NRND, you could still get the part but support will be limited.

    Justin
  • 0 in reply to Justin Bohr
    Intellectual 860 points

    Hi, thanks for looking at this. Yes I was looking at the TAS5558 becasue of the I2S output possiblity but when you look closer at the data sheet I can't really see a way to mix 8 - 1 channel L or R I2S inputs to the L or R I2S output. It appears the mix routing is more for PWM output. maybe i'm wriong here? also channel 7 & 8 have to go though a 3rd mix group?

    Anyway, I was looking for a fully flexible crossbar mixer that could route any channel to anywhere with possibly 4 outputs. I looked at the TAS3108 and the way its programed looks out of date and I'm looking for a chip that will last a few years down the road for my design.

    Can you recommend a more modern TI DSP kit that I could buy that can route / mix 8 inputs to 2 or 4 outputs? I too a look at the mini DSP pureparh software for the TI codecs but its more for 2 or maybe 4 channel mixing and audio conditioning.

  • 0 in reply to ben biles
    TI__Mastermind 27990 points
    Hi Ben,

    The first DSP I would look at would be the TMS320C5505, although this has 4 ports for 8 channels of I2S, you would still need 1 more I2S data line for the output. Therefore the best choice might be to look at the C6000 DSPs.

    Justin