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PCM2903C: PCM2903C: VIN Caps

Part Number: PCM2903C

This is a follow up questions from another questions posted on a locked thread. The question was whether a ceramic capacitor could be used instead of an electrolytic capacitor and the answer was, Yes it could be. 

When connecting the Vin through the amplifier circuit described in the following circuit schematic, I noticed that the output signal of the amplifier (viewing on a oscilloscope) drops to 0 volts when connected to the ceramic capacitor. When I replaced the ceramic cap with an electrolytic capacitor the amplified output voltage maintained and I was able to record audio via the Windows Voice Recorder application. 

My question is why this would happen between the two different types of capacitors and for space conservation on the PCB what I can do to use a ceramic cap instead?

Both capacitors are 10 uF

Reference: 

Prevision Thread: e2e.ti.com/.../pcm2903c-vin-caps

Circuit Schematic: www.ti.com/.../sbfa020

Ceramic Cap Datasheet: www.digikey.com/.../3894472

  • Hi Michael,

    It sounds to me like the ceramic capacitor might be damaged in some way? you are saying that you get no output from the amplifier when you use a series ceramic capacitor on the input pins?

    ceramic capacitors capacitance will tend to be less linear across the applied voltage, so we would expect that the ceramic capacitor would give worse distortion performance, but you should still get signal through them. have you tried with multiple ceramic capacitors?

    Regards,
    Arthur