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PCM5102A: can PCM5102 be damaged , if DVDD supply is 0 V (short to GND) ?

Prodigy 50 points

Replies: 6

Views: 976

Part Number: PCM5102A

Hello,

i connected PCM5102a with 2x VDD , 3.3 V ; the AVDD was 3.3V , but DVDD was shorted to GND on first power up, input signals active at 3.3V level;

then found the short, removed it and power up again; but -- no output signal coming , L/R out at zero.

so : can this chip be damaged now ?  (input L/R , data, Bclk (left just.) seem ok, an old DAC is playing with same signals same time)

  • Hi Alfred,

    It is difficult to say whether the PCM5102 is damaged. It may depend on the current your digital pins were capable of sourcing. When DVDD is held low the ESD diodes on the digital input pins would be during on when the inputs were high, sinking current from the digital resource. I suggest you investigate how if there are other issues with the board before you replace the device. You could also confirm if the device is consuming the correct quiescent current, as specified in the datasheet (page 9 and 10). If the current is incorrect and you can find no other issues with the board, then you should replace the device.

    Thanks!
    Paul
  • In reply to Paul_Frost:

    Thanks for helping,
    i will check power current (and tell..) ; input been driven by 74LVX32 ...;

    best regards
    Alfred
  • In reply to Alfred Schaub:

    so i checked: 3.307 V analog, 3.296 V dig. + current: 30.8 mA zero-data , 12.7 mA music-data ; datasheet (should be) 26mA idle, 32mA with data;
    this puzzles me - less current consumtion with data/music than with zero data ? and this is not matching values from datasheet...so..?
  • In reply to Alfred Schaub:

    As these values do not match the datasheet, I recommend you replace the device. In addition, you should inspect the board to ensure that there is not some other short, like a digital line accidentally shorted to GND or a higher voltage supply.

    Thanks!
    Paul
  • In reply to Paul_Frost:

    Thanks Paul,
    i think the same...i will try and then tell...

    best regards
    Alfred
  • In reply to Alfred Schaub:

    Hello,
    the idea, to look at actual current, and compare to datasheet - was really helpful. i found a problem with a connection - L/R clock had a bad solder contact (maybe this make the chip try PLL on, then off, and on...) ; now current is about 1mA (no clocks), 22mA (clocks , 0 data) and 33mA (clocks and data); this seem correct - and signal coming out. fine.

    thanks Paul !

    best regards
    Alfred

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