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LM48901 - Spatial Audio Alternative?

Scott Dickey
Prodigy 30 points
Other Parts Discussed in Thread: LM48901, TAS5727, PCM5102

I was wondering if there were any other products that utilized your Spatial Audio algorithms.  I was interested in something with a little more power than the LM48901.  I understand it's possible to use the I2S port as an output to drive an external Class D, but for my application it might be necessary to use a higher quality external ADC instead of the 18-bit Stereo ADC on the LM48901.

  • 0
    TI__Guru**** 189401 points

    Hi, Scott,

    You've confused me. You want more power, but you're also talking about the ADC?

    Is your input analog or I2S?

    You can use the I2S out to drive one of our I2S amps like TAS5727 or you can use it to drive one of our converters like PCM5102.

    -d2

  • 0 in reply to Don Dapkus
    Prodigy 30 points

    Hi Don,

    Sorry I confused you.  I'm interested in harnessing your Spatial Audio algorithms on the  LM48901.  The first problem is, I need more power than the LM48901 is giving.  I understand there's two ways of doing this:

    1) Use the I2S port as an output to an external I2S amp, therefore forcing me to use the ADC input on the LM48901.

    2) Filter the Class D output to get an analog signal and feed an external amp that has an analog input.

    I would rather not go with option 2.  If I go with option 1, I'm forced to use the 18-bit Stereo ADC on the LM48901 instead of using an external higher quality ADC with the I2S port as an input.  I guess I was wondering if you offered any other parts that used the Spatial Audio algorithms and had an I2S input (that the higher quality ADC would feed) AND an I2S output (to feed the higher power amp).  

  • 0 in reply to Scott Dickey
    TI__Expert 3350 points

    Scott,

    We don't currently have any other spatial audio parts that exactly fit what you're looking for.  There is a way to accomplish what you're trying to do with the 901, but it is a bit complicated.  The 901 has an auxillary I2S SDO output hidden behind the SHDN pin, which allows for simultanous I2S input and output from the device.  SDO can only carry two channels of data, so you will need two 901s to drive 4 speakers from external I2S input amps (which I agree is the better way to go). 

    You would feed the same input to both devices and load the same coefficeints to both devices.  For one of the 901s you would output DSP1/2 on SDO, for hte other you would output DSP3/4 on SDO.

    Let me know if you have any questions.

    Regards,

    royce

  • 0 in reply to Royce Higashi
    Prodigy 30 points

    Great, thanks for the info, Royce.  I don't know if it's going to be feasible for us to double the cost to have that functionality.  Maybe I can deal with the 18-bit ADC.  This is currently being looked into for experimental purposes, so the end product has not been defined yet.  Again, thanks for your help!