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PCM3168A: capacitor selection

Shifali N
Expert 2175 points
Part Number: PCM3168A
Other Parts Discussed in Thread: TIDA-00609

Hi,

I am using PCM3168APAP in my design. I referred to the Figure 58,59,60and 61 and observed while connecting input signal to buffer it is connected via electrolytic capacitors. I referred to DEM-DAI3168A schematics. It has electrolytic capacitors connected.( Eg Designators:C601,C607,C501,C502). When I referred the  TIDA-00609 it has ceramic capacitors connected at input of buffer.(Eg Designators: C200,C207,C241,C242). Which one is the correct selection of capacitor. Whether we should consider electrolytic or ceramic capacitors. My audio sampling frequency requirement is 48kHz

2. There are different system connection mentioned in section 10.3. Is there any reference example for Differential to Differential Buffer

  • 0
    TI__Mastermind 23050 points

    Hi Shifali,

    If you are referring to the AC coupling capacitors then as long as you respect their polarity electrolytic capacitors are going to be much better from a distortion standpoint as their capacitance does not change much with applied voltage, whereas ceramic capacitors vary significantly over their supported voltage range and this introduces distortion at high signal levels. If you use sufficiently large capacitors, you can minimize the voltage across the capacitor and it's not really a problem. For any other caps in the signal path, I would recommend using C0G/NP0 ceramic caps. 

    You can follow very similar recommendations for a differential buffer, just make sure you scale the gain as desired.

    Best,

    Zak