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AD811 Slew Rate

Why does the AD811 have a slew rate of 2500 V/us for an output swing of 20 Vp-p, but only 400 V/us for an output swing of 4 Vp-p?  Is this correct or is there an error in the data sheet?

  • Hi,

    I think the typical values of SR for these output swings are correct.

    For an instance in a buffer config, the larger the input voltage you have, the larger the gap between your IN+ and IN- pins you have in your time 0.
    Thus, your amplifier will try to correct this error as fast as possible.

    I have also tried to simulate with input of 10Vp-p(that is between the listed input on DS), and the expected SR will be between 400 and 2500V/us.
    Below is the simulation result

    For SR taken at 10% to 90% of the 10Vpp signal, that is 8V.
    The change in time to achieve this change in voltage is ~3.6ns.
    This will then result to SR of 2222V/us.

    Thanks and regards.