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PCM5101A: LDOO pin

Shuji Ishiwata
Mastermind 8090 points
Part Number: PCM5101A
Other Parts Discussed in Thread: PCM5142,

Tool/software:

Hi All,

Is the 10uF electrolytic capacitor on the LDOO pin necessary?
Also, if possible, can I change the electrolytic capacitor to a ceramic capacitor?

Best Regards,
Ishiwata

  • 0
    TI__Mastermind 32191 points

    Hello,

    similar to any other supply voltage you want to use the decoupling capacitor on LDOO as well, so you should not skip them.

    The users guide has the recommended cap types and values , which are used on the EVM as well. In general one should  stay with those  recommendation , but if one needs to replace a component due to some constraint, it should be ok.

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Mastermind 8090 points

    Hi Arash,

    Thanks for your answer.

    For example, the circuit diagram in the datasheet for the PCM5142 lists the 10uF electrolytic capacitor as DNP, so I wondered if the PCM5101A could also be DNP.


    Could you please tell me why the PCM5142 is DNP?

    Best Regards,
    Ishiwata

  • 0 in reply to Shuji Ishiwata
    TI__Mastermind 32191 points

    Hello Ishiwata, 

    It all depends on supplies and board. In the EVM schematics, all 10uF are DNP, seems there is  already  good stability for those supplies (there is a 100uF  connected to the 3.3VA  supply switches.) So on the EVM,  they DNP all the 10uF caps at the pins including LDOO.  Since with only 0.1uF LDO's  stability is fine, I don't see any issue with leaving 10uF out  for this case. 

    Regards,

    Arash