• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 29 subscribers
  • Views 221 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

PCM1863: VREF and VDD Capacitors

Michael Balourdas
Expert 5525 points
Part Number: PCM1863


Hello,

My customer wants to use 100uF for VREF and 220uF for VDD as they have found this gives the best audio performance. Are there any issues with these values?

Thanks,

Michael

  • 0
    TI__Mastermind 23030 points

    I would suggest to use 2.2u for Vref and 10u for AVDD.

    Normally Vref is derived from a small Current source. A very Large Capacitor means a very long startup time for the Vref supply and is not suggested.

    It may be that the customer is seeing poor performance due to improper PCB Layout and a large Vref and AVDD Cap  is somehow masking this.