Because of the holidays, TI E2E™ design support forum responses will be delayed from Dec. 25 through Jan. 2. Thank you for your patience.

  • State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 30 subscribers
  • Views 1230 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

PCM5100A-Q1: PCM5100A-Q1 schematic review

Sherry Liang
Genius 10255 points
Part Number: PCM5100A-Q1

Dear team,

Could you please help review the PCM5100A-Q1 schematic of my customer?

Thanks & Best Regards,

Sherry

  • 0
    TI__Guru 53573 points

    Hi Sherry,

    A few comments:

    1. Capacitors C6122 and C6123 seem pretty large.  The low-pass filter created by this RC would have a cutoff-frequency of about 150Hz, which would be most of the audible range.  These are more commonly 2.2nF.

    2. They should verify the voltage rating of C6111 and C6112.  These should be about 2.2uF at 3.3V, but most capacitors suffer from a voltage-coefficient of capacitance, where the capacitance of the device reduces as the voltage on the cap approaches it's rating.  As customer desire smaller caps, they use smaller ratings, such as 6.3V, but it is common for the capacitance value to be <60% at 3.3V with a 6.3V rating.  See the example curve below:

    The other capacitor values are somewhat less critical as they are for decoupling and noise filtering.

    Thanks,

    Paul