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Does PCM5101A have any output protection?

For example, outputs to ground and outputs to my board Vcc (32V).

These pins (outputs) will be exposed, so I need to protect them.

Thanks.

  • When you connect output of the DAC to some voltage, that DAC will try to set on his output right output voltage, maximum 2.1V RMS. Minimum impedance of the connected amplifier is 1Kohm. If you will use recommended output filter from serial resistor 470R and 2n2 capacitor that it will be probably enough protection for prevention of damage output drivers.

  • There is integrated Short to GND detection and automute that will also auto recover.

    For instance, we took the EVM and applied short directly across the outputs (Left Output and GND). The device handles it elegantly.

    However, your 32V risk is a major concern for me. The device's internal ESD structure can handle a very short burst at high voltage. (the nature of ESD events). A sustained overvoltage condition could cause them to fail as the current through the ESD structure would cause them to overheat and fail.

    Thanks again

    Dafydd Roche

     

  • Hello Dafydd

    Thanks for the reply.

    Is there any way to protect the outputs from 32V? I was thinking about a diode in series (this way it'll case a voltage drop) or increase the resistor of the filter.

    What do you think about it?

  • you'd have to increase the resistor significantly to limit the current that would come back through the device and up through the ESD diodes.
    Relying on ESD diode for anything more than ESD shocks really isn't a recommended practice.