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TLV320AIC3204: two simultaneous I2S inputs?

Part Number: TLV320AIC3204
Other Parts Discussed in Thread: TLV320AIC3262

Hi Team,

Do we have any audio data converters that can take two separate I2S inputs and output a single mixed mono result? I noticed the AIC3204 has a primary and secondary I2S inputs but it looks like the pin muxing doesn't allow this. Are there some data converters that can do this? It's okay if this is mixed in the analog or the digital domain, as long as it outputs on the same single speaker. 

I'm trying to find a replacement to the MAX98089 which has two I2S inputs and can do this. the LM49350 also looks like it has two inputs, but I'm not sure if it would work and I'd prefer to use a part with an EVM. 

Thanks!

Nate

  • Hi, Nate,

    As you mention, The 'AIC3204 has two I²S interfaces, however, it is not possible to use them at the same time. An alternative device for an application like this where two I²S sources are required to be mixed would be the TLV320AIC3262, this part has up to three interfaces that can be mixed within the miniDSP of the part. Also, this device has an integrated Class D speaker driver.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • Hi Diego,

    Thank you for the quick reply! I was worried that was the case. The AIC3262 seems to fit the requirements but it is a little expensive. I noticed the LM49350 also has two independent I2S inputs (both are bidirectional and can act as a slave) and also a digital mixer. It's also very inexpensive compared to the AIC3262. Do you know if two separate inputs can be mixed together from I2S to form a single output?

    Thank you,
    Nate
  • Hi, Nate,

    As you mention, the LM49350 features a digital mixer that could be used to mix the two serial interfaces, however, this is a quite old part without an EVM and the support and collateral information we can offer is limited. I would recommend the AIC3262 instead for this application.

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • Hi Diego,

    Thank you for the confirmation and candid feedback on support. This is just what I was looking for. 

    Best regards,

    Nate