Hi Jason
Looks like your calculations check out OK.
I've never seen 2nd order slew rate specified - but you could check
distortion figures, if they're available.
As far as rounding goes, I'd look at a simulation package or even set up a
spreadsheet type approach if it's critical.

Re the actual figure - what supply rail are you running? Slew rate
typically applies in the small signal linear region and if youre trying for
5V pk-pk on a 5V supply you will probably have issues. There may be a
difference between large (>20% supply ?)  & small signal (<5% ?) rates.

RP

On Fri, 7 Jun 2019 at 07:31, Jason White <whitewaterssoftwareinfo@gmail.com=
>
wrote:

> Hello PICLIST,
>
> I am looking for a sanity check.
>
> The MCP6001 has a published minimum slew rate of at least 0.4V/us at
> 5V and -40C. 0.4V/us=3D400kV/s.
>
> In my application I am generating a 5V pk-pk 25kHz triangle wave. The
> slew rate of a 25kHz triangle wave voltage rise V over time t. For
> slew rate the time would be 1/2 the period of the triangle wave or
> 1/2*1/25kHz=3D20us, the rise would be 5V. 5V/20us=3D250kV/S=3D0.25V/us
>
> According to this the required slew rate for the triangle wave is
> 0.25V/us which is within the 0.4V/us limit.
>
> Four questions:
> * Does the slew rate calculation given above "check out" ?
> * Slew rate is rate of change (the first derivative) of the output.
> Are op-amps ever rated for rate of rate of change (second derivative)
> of the output?
> * Is there a way to deduce how much rounding will occur on the sharp
> points of the triangle wave from the MCP6001 ratings?
>
> --
> Jason White
> --
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