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TLV320DAC3203 voltage question and advice

anthony conti
Intellectual 460 points

Other Parts Discussed in Thread: TLV320DAC3203

Hello all,

 

I am getting a little confused with the voltage requirements for the TLV320DAC3203. I am seeing from the datasheet, I need 4 different voltage lines: analog, digital, IO, and LDOin. Could the DAC be driven from one LI-oin battery? Should I add some form of filtering to each power line? Would anyone have some advice for me?

 

Thanks

Anthony

PS. hope this is understandable, I had to write this fast.

  • 0
    TI__Guru* 84915 points
    Hi, Anthony,

    The TLV320DAC3203 has several power supply pins with different voltage ranges. These ranges must be respected in order to ensure a correct behavior of the device. Almost all the power supply pins can be used at 1.8V. However, LDOin pin doesn't support 1.8V. So, it would be necessary to use more than one power source.

    Best regards,
    Luis Fernando Rodríguez S.
  • 0 in reply to Luis Fernando Rodriguez S.
    Intellectual 460 points

    Thank you for the reply Luis,

    So how would you recommend I hook it up?

    One Idea I had is:

    Li-ion battery to LDO 3.3v regulator, then hooked to LDOin and IOvdd (my MCU is 3.3V)

    Avdd tied to Dvdd

    Bypass caps would be on all voltage inputs. 

    The eval module is a little vague to me on a good power input setup, since some of the voltages are being powered from the USB mother board.

    Thank you for any advice you could give me.

    Anthony

  • 0 in reply to anthony conti
    TI__Guru* 84915 points
    Hi, Anthony,

    The configuration that you suggested would be fine. Additionally, these codecs are tolerant to power supplies sequences. However, in rare cases, the audio performance is affected by the power sequence. In these cases, the digital supplies must be turned on at first and then the analog power supplies.

    In all cases, you must be sure that the power supplies are well regulated.

    Best regards,
    Luis Fernando Rodríguez S.
  • 0 in reply to Luis Fernando Rodriguez S.
    Intellectual 460 points
    Luis,

    Thank you so much for your time, and your advice. That helps me out so much.

    Thank you
    Anthony