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OPA521: Enable/Disable timing

David Dufke
Prodigy 30 points
Part Number: OPA521

Hi,

According to the datasheet, the enable and disable times for OPA521 are 3 and 2 milliseconds respectively. This would be far too slow for my application.

However, measuring on the EVM gives me a value of about 31 microseconds for turn-on, and about 5us for shutdown. These times are reasonable... but can I rely on them? Is the datasheet wrong, or is there some situation in which it can become 100 times slower?!

Best regards, David

  • 0
    TI__Guru 54331 points

    Hi David,

    Questions:

    However, measuring on the EVM gives me a value of about 31 microseconds for turn-on, and about 5us for shutdown. These times are reasonable... but can I rely on them? Is the datasheet wrong, or is there some situation in which it can become 100 times slower?!

    OPA521 EN/SD timing pins in the datasheet had typo. The both units should have been in microseconds. We visited the scope shots in the part, the timing units are recorded in usec. 

    Best,

    Raymond

  • 0 in reply to Raymond Zhang1
    Prodigy 30 points

    Hi Raymond,

    Well, it is good that they were not in milliseconds at least. They still don't match my measurements though (3us datasheet vs. 31us measured). I realize they are just typical values, but a factor 10 slower seems excessive.

    Best regards, David