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LM49450: Is this product still supported for new projects?

John Heaton
Intellectual 550 points
Part Number: LM49450
Other Parts Discussed in Thread: TLV320AIC3212, TLV320AIC3110

The LM49450 is clearly an older part from National. It has a unique set of integrated features (I2S input + Headphone amp + stereo amp + HP sense) that I need in my design. It also seems that there are no demo (EVM) boards available any longer and very little 3rd party implementations on demo boards. So the question is - Is this device safe to design into a new product or does TI recommend an alternative product? Can you still get a demo board?

Thanks for you time!

John

  • 0
    TI__Guru* 95335 points
    Hi John,

    Unfortunately this device may be hard to support as there are no evaluation boards available although the device is still active. In addition the information available of these LM devices is limited.
    You could take a look at some of our codecs like TLV320AIC3110 or TLV320AIC3212. These devices support I2S input, headphone and stereo Class-D outputs and headphone detection. Both devices have evaluation boards available.
    I hope this helps. Please let me know your thoughts.

    Best regards,
    -Ivan Salazar
    Texas Instruments
  • 0 in reply to Ivan Salazar
    Intellectual 550 points
    Thanks for the quick reply Ivan! Yes this very much helps and I will in fact give one of these products a try! Thanks a million!
    John
  • 0 in reply to Ivan Salazar
    Intellectual 550 points

    I have a quick question that may save me a lot of reading. I did purchase the TLV320AIC3110-EVM and have it working. The out of the box demo uses the USB to interface to the PC music and it all works fine. I'm going to now hook up my I2S and wonder if it will just process the stream directly to the amps/microphone without using the GUI on the PC? Basically I have a DSP already doing all the processing and just want to use the chip as a DIgital amp/HP/HP sense slave device. Will I need to program the chip with this standard functionality and then whenever the chip is powered, it automatically performs this standard functionality? 

  • 0 in reply to John Heaton
    TI__Guru* 95335 points
    Hi John,

    The TLV320AIC3110 will start with its registers on default values. You can see default values in the device data sheet.
    Some default values that you may be interested is that the interface is set to I2S,16 bit, BCLK and WCLK as input. Most clock dividers are disabled. Input clock is set to MCLK. DOSR is set to 128. DAC, Headphone and Class-D drivers are powered down.
    You may need to configure the device to your needs using an initialization script that will be used every time the device is powered up. TLV320AIC3110 is not able to keep register values after a power down - power up sequence.

    Best regards,
    -Ivan Salazar
    Texas Instruments