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LM4675SDBD: Single power supply od double power supply.

Stefano Sivera
Prodigy 231 points
Part Number: LM4675SDBD


Dear support team,

In my applicatio I have two powe supply generator, one at 5V high curren capable with more noise, another at 3,4V low noise but low current capable.
Can I connect PVCC at 5V power supply and VDD at 3,3V power supply ?

This can be usefull for avoiding noise in audio path 

Thank you for answers.

Best Regards

Stefano 

  • 0
    TI__Guru** 112195 points

    Hi Stefano,

    Using separate supplies for VDD and PVDD may work, although this is not tested and/or validated on TI side; make sure to run proper testing in this configuration.

    Unless the noise on the 5V rail is too high, perhaps the PSRR from the amplifier and proper local decoupling can help using a single supply.

    Best regards,
    -Ivan Salazar
    Applications Engineer