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TOO MUCH NOISE IN PCM5102PWR OUTPUT?

Ditish Maharjan
Prodigy 70 points

Other Parts Discussed in Thread: PCM5102

I recently designed a ckt for I2S audio interface for odroid using PCM5102PWR. The circuit works but the output audio has a lot of noise. This is my first time in dealing with audio ckts. I tried replacing the 2.2nF capacitors at the OUTL and OUTR with 100nF cap but the noise is still there. The PCB on which this is present has two SMPS for power supply for other parts, the power supply for PCM5102 is from the odroid C1+ 3.3V output. So, can the SMPS has induce noise on the output? and How can reduce the noise on the output? I have attached the schematic.

Thank youAudio_interface_PCM5102PWR.PDF 

  • TI__Mastermind 28120 points
    Hi Ditish,

    What is the frequency of the noise? SMPS could definitely be the source of the noise, but there are many possibilities for the source of noise. If you identify the frequency/shape of the noise, you can then look for the source of it.

    Justin